diff --git a/cmds/dumpstate/dumpstate.cpp b/cmds/dumpstate/dumpstate.cpp
index cd7c4aa..a67d204 100644
--- a/cmds/dumpstate/dumpstate.cpp
+++ b/cmds/dumpstate/dumpstate.cpp
@@ -54,7 +54,7 @@
 static char cmdline_buf[16384] = "(unknown)";
 static const char *dump_traces_path = NULL;
 
-// TODO: should be part of dumpstate object
+// TODO: variables below should be part of dumpstate object
 static unsigned long id;
 static char build_type[PROPERTY_VALUE_MAX];
 static time_t now;
@@ -68,7 +68,7 @@
 
 #define PSTORE_LAST_KMSG "/sys/fs/pstore/console-ramoops"
 
-#define RAFT_DIR "/data/misc/raft/"
+#define RAFT_DIR "/data/misc/raft"
 #define RECOVERY_DIR "/cache/recovery"
 #define RECOVERY_DATA_DIR "/data/misc/recovery"
 #define LOGPERSIST_DATA_DIR "/data/misc/logd"
@@ -219,6 +219,40 @@
     }
 }
 
+static void dump_raft() {
+    if (is_user_build()) {
+        return;
+    }
+
+    std::string raft_log_path = bugreport_dir + "/raft_log.txt";
+    if (raft_log_path.empty()) {
+        MYLOGD("raft_log_path is empty\n");
+        return;
+    }
+
+    struct stat s;
+    if (stat(RAFT_DIR, &s) != 0 || !S_ISDIR(s.st_mode)) {
+        MYLOGD("%s does not exist or is not a directory\n", RAFT_DIR);
+        return;
+    }
+
+    if (!zip_writer) {
+        // Write compressed and encoded raft logs to stdout if not zip_writer.
+        run_command("RAFT LOGS", 600, "logcompressor", "-r", RAFT_DIR, NULL);
+        return;
+    }
+
+    run_command("RAFT LOGS", 600, "logcompressor", "-n", "-r", RAFT_DIR,
+            "-o", raft_log_path.c_str(), NULL);
+    if (!add_zip_entry("raft_log.txt", raft_log_path)) {
+        MYLOGE("Unable to add raft log %s to zip file\n", raft_log_path.c_str());
+    } else {
+        if (remove(raft_log_path.c_str())) {
+            MYLOGE("Error removing raft file %s: %s\n", raft_log_path.c_str(), strerror(errno));
+        }
+    }
+}
+
 static bool skip_not_stat(const char *path) {
     static const char stat[] = "/stat";
     size_t len = strlen(path);
@@ -507,7 +541,7 @@
     property_get("ro.build.display.id", build, "(unknown)");
     property_get("ro.build.fingerprint", fingerprint, "(unknown)");
     property_get("ro.build.type", build_type, "(unknown)");
-    property_get("ro.baseband", radio, "(unknown)");
+    property_get("gsm.version.baseband", radio, "(unknown)");
     property_get("ro.bootloader", bootloader, "(unknown)");
     property_get("gsm.operator.alpha", network, "(unknown)");
     strftime(date, sizeof(date), "%Y-%m-%d %H:%M:%S", localtime(&now));
@@ -701,8 +735,6 @@
 
     run_command("LOG STATISTICS", 10, "logcat", "-b", "all", "-S", NULL);
 
-    run_command("RAFT LOGS", 600, SU_PATH, "root", "logcompressor", "-r", RAFT_DIR, NULL);
-
     /* show the traces we collected in main(), if that was done */
     if (dump_traces_path != NULL) {
         dump_file("VM TRACES JUST NOW", dump_traces_path);
@@ -1275,6 +1307,9 @@
     // Dumps systrace right away, otherwise it will be filled with unnecessary events.
     dump_systrace();
 
+    // TODO: Drop root user and move into dumpstate() once b/28633932 is fixed.
+    dump_raft();
+
     // Invoking the following dumpsys calls before dump_traces() to try and
     // keep the system stats as close to its initial state as possible.
     run_command_as_shell("DUMPSYS MEMINFO", 30, "dumpsys", "-t", "30", "meminfo", "-a", NULL);
diff --git a/cmds/installd/commands.cpp b/cmds/installd/commands.cpp
index 2a9950a..8999441 100644
--- a/cmds/installd/commands.cpp
+++ b/cmds/installd/commands.cpp
@@ -28,9 +28,9 @@
 #include <sys/xattr.h>
 #include <unistd.h>
 
+#include <android-base/logging.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
-#include <android-base/logging.h>
 #include <android-base/unique_fd.h>
 #include <cutils/fs.h>
 #include <cutils/log.h>               // TODO: Move everything to base/logging.
@@ -49,6 +49,7 @@
 #define LOG_TAG "installd"
 #endif
 
+using android::base::EndsWith;
 using android::base::StringPrintf;
 
 namespace android {
@@ -1313,13 +1314,29 @@
     return true;
 }
 
-static void trim_extension(char* path) {
-  // Trim the extension.
-  int pos = strlen(path);
-  for (; pos >= 0 && path[pos] != '.'; --pos) {}
-  if (pos >= 0) {
-      path[pos] = '\0';  // Trim extension
+// Translate the given oat path to an art (app image) path. An empty string
+// denotes an error.
+static std::string create_image_filename(const std::string& oat_path) {
+  // A standard dalvik-cache entry. Replace ".dex" with ".art."
+  if (EndsWith(oat_path, ".dex")) {
+    std::string art_path = oat_path;
+    art_path.replace(art_path.length() - strlen("dex"), strlen("dex"), "art");
+    CHECK(EndsWith(art_path, ".art"));
+    return art_path;
   }
+
+  // An odex entry. Not that this may not be an extension, e.g., in the OTA
+  // case (where the base name will have an extension for the B artifact).
+  size_t odex_pos = oat_path.rfind(".odex");
+  if (odex_pos != std::string::npos) {
+    std::string art_path = oat_path;
+    art_path.replace(odex_pos, strlen(".odex"), ".art");
+    CHECK_NE(art_path.find(".art"), std::string::npos);
+    return art_path;
+  }
+
+  // Don't know how to handle this.
+  return "";
 }
 
 static bool add_extension_to_file_name(char* file_name, const char* extension) {
@@ -1330,7 +1347,7 @@
     return true;
 }
 
-static int open_output_file(char* file_name, bool recreate, int permissions) {
+static int open_output_file(const char* file_name, bool recreate, int permissions) {
     int flags = O_RDWR | O_CREAT;
     if (recreate) {
         if (unlink(file_name) < 0) {
@@ -1388,19 +1405,110 @@
     return analyse_profiles(uid, pkgname);
 }
 
+static const char* parse_null(const char* arg) {
+    if (strcmp(arg, "!") == 0) {
+        return nullptr;
+    } else {
+        return arg;
+    }
+}
+
+int dexopt(const char* params[DEXOPT_PARAM_COUNT]) {
+    return dexopt(params[0],                    // apk_path
+                  atoi(params[1]),              // uid
+                  params[2],                    // pkgname
+                  params[3],                    // instruction_set
+                  atoi(params[4]),              // dexopt_needed
+                  params[5],                    // oat_dir
+                  atoi(params[6]),              // dexopt_flags
+                  params[7],                    // compiler_filter
+                  parse_null(params[8]),        // volume_uuid
+                  parse_null(params[9]));       // shared_libraries
+    static_assert(DEXOPT_PARAM_COUNT == 10U, "Unexpected dexopt param count");
+}
+
+// Helper for fd management. This is similar to a unique_fd in that it closes the file descriptor
+// on destruction. It will also run the given cleanup (unless told not to) after closing.
+//
+// Usage example:
+//
+//   Dex2oatFileWrapper<std::function<void ()>> file(open(...),
+//                                                   [name]() {
+//                                                       unlink(name.c_str());
+//                                                   });
+//   // Note: care needs to be taken about name, as it needs to have a lifetime longer than the
+//            wrapper if captured as a reference.
+//
+//   if (file.get() == -1) {
+//       // Error opening...
+//   }
+//
+//   ...
+//   if (error) {
+//       // At this point, when the Dex2oatFileWrapper is destructed, the cleanup function will run
+//       // and delete the file (after the fd is closed).
+//       return -1;
+//   }
+//
+//   (Success case)
+//   file.SetCleanup(false);
+//   // At this point, when the Dex2oatFileWrapper is destructed, the cleanup function will not run
+//   // (leaving the file around; after the fd is closed).
+//
+template <typename Cleanup>
+class Dex2oatFileWrapper {
+ public:
+    Dex2oatFileWrapper() : value_(-1), cleanup_(), do_cleanup_(true) {
+    }
+
+    Dex2oatFileWrapper(int value, Cleanup cleanup)
+            : value_(value), cleanup_(cleanup), do_cleanup_(true) {}
+
+    ~Dex2oatFileWrapper() {
+        reset(-1);
+    }
+
+    int get() {
+        return value_;
+    }
+
+    void SetCleanup(bool cleanup) {
+        do_cleanup_ = cleanup;
+    }
+
+    void reset(int new_value) {
+        if (value_ >= 0) {
+            close(value_);
+        }
+        if (do_cleanup_ && cleanup_ != nullptr) {
+            cleanup_();
+        }
+
+        value_ = new_value;
+    }
+
+    void reset(int new_value, Cleanup new_cleanup) {
+        if (value_ >= 0) {
+            close(value_);
+        }
+        if (do_cleanup_ && cleanup_ != nullptr) {
+            cleanup_();
+        }
+
+        value_ = new_value;
+        cleanup_ = new_cleanup;
+    }
+
+ private:
+    int value_;
+    Cleanup cleanup_;
+    bool do_cleanup_;
+};
+
 int dexopt(const char* apk_path, uid_t uid, const char* pkgname, const char* instruction_set,
            int dexopt_needed, const char* oat_dir, int dexopt_flags, const char* compiler_filter,
            const char* volume_uuid ATTRIBUTE_UNUSED, const char* shared_libraries)
 {
-    struct utimbuf ut;
-    struct stat input_stat;
-    char out_path[PKG_PATH_MAX];
-    char swap_file_name[PKG_PATH_MAX];
-    char image_path[PKG_PATH_MAX];
-    const char *input_file;
-    char in_odex_path[PKG_PATH_MAX];
-    int res;
-    fd_t input_fd=-1, out_fd=-1, image_fd=-1, swap_fd=-1;
     bool is_public = ((dexopt_flags & DEXOPT_PUBLIC) != 0);
     bool vm_safe_mode = (dexopt_flags & DEXOPT_SAFEMODE) != 0;
     bool debuggable = (dexopt_flags & DEXOPT_DEBUGGABLE) != 0;
@@ -1410,12 +1518,16 @@
     CHECK(pkgname != nullptr);
     CHECK(pkgname[0] != 0);
 
-    fd_t reference_profile_fd = -1;
     // Public apps should not be compiled with profile information ever. Same goes for the special
     // package '*' used for the system server.
+    Dex2oatFileWrapper<std::function<void ()>> reference_profile_fd;
     if (!is_public && pkgname[0] != '*') {
         // Open reference profile in read only mode as dex2oat does not get write permissions.
-        reference_profile_fd = open_reference_profile(uid, pkgname, /*read_write*/ false);
+        const std::string pkgname_str(pkgname);
+        reference_profile_fd.reset(open_reference_profile(uid, pkgname, /*read_write*/ false),
+                                   [pkgname_str]() {
+                                       clear_reference_profile(pkgname_str.c_str());
+                                   });
         // Note: it's OK to not find a profile here.
     }
 
@@ -1423,10 +1535,13 @@
         LOG_FATAL("dexopt flags contains unknown fields\n");
     }
 
+    char out_path[PKG_PATH_MAX];
     if (!create_oat_out_path(apk_path, instruction_set, oat_dir, out_path)) {
         return false;
     }
 
+    const char *input_file;
+    char in_odex_path[PKG_PATH_MAX];
     switch (dexopt_needed) {
         case DEXOPT_DEX2OAT_NEEDED:
             input_file = apk_path;
@@ -1445,35 +1560,41 @@
 
         default:
             ALOGE("Invalid dexopt needed: %d\n", dexopt_needed);
-            exit(72);
+            return 72;
     }
 
+    struct stat input_stat;
     memset(&input_stat, 0, sizeof(input_stat));
     stat(input_file, &input_stat);
 
-    input_fd = open(input_file, O_RDONLY, 0);
-    if (input_fd < 0) {
+    base::unique_fd input_fd(open(input_file, O_RDONLY, 0));
+    if (input_fd.get() < 0) {
         ALOGE("installd cannot open '%s' for input during dexopt\n", input_file);
         return -1;
     }
 
-    out_fd = open_output_file(out_path, /*recreate*/true, /*permissions*/0644);
-    if (out_fd < 0) {
+    const std::string out_path_str(out_path);
+    Dex2oatFileWrapper<std::function<void ()>> out_fd(
+            open_output_file(out_path, /*recreate*/true, /*permissions*/0644),
+            [out_path_str]() { unlink(out_path_str.c_str()); });
+    if (out_fd.get() < 0) {
         ALOGE("installd cannot open '%s' for output during dexopt\n", out_path);
-        goto fail;
+        return -1;
     }
-    if (!set_permissions_and_ownership(out_fd, is_public, uid, out_path)) {
-        goto fail;
+    if (!set_permissions_and_ownership(out_fd.get(), is_public, uid, out_path)) {
+        return -1;
     }
 
     // Create a swap file if necessary.
+    base::unique_fd swap_fd;
     if (ShouldUseSwapFileForDexopt()) {
         // Make sure there really is enough space.
+        char swap_file_name[PKG_PATH_MAX];
         strcpy(swap_file_name, out_path);
         if (add_extension_to_file_name(swap_file_name, ".swap")) {
-            swap_fd = open_output_file(swap_file_name, /*recreate*/true, /*permissions*/0600);
+            swap_fd.reset(open_output_file(swap_file_name, /*recreate*/true, /*permissions*/0600));
         }
-        if (swap_fd < 0) {
+        if (swap_fd.get() < 0) {
             // Could not create swap file. Optimistically go on and hope that we can compile
             // without it.
             ALOGE("installd could not create '%s' for swap during dexopt\n", swap_file_name);
@@ -1486,111 +1607,108 @@
     }
 
     // Avoid generating an app image for extract only since it will not contain any classes.
-    strcpy(image_path, out_path);
-    trim_extension(image_path);
-    if (add_extension_to_file_name(image_path, ".art")) {
-      char app_image_format[kPropertyValueMax];
-      bool have_app_image_format =
-              get_property("dalvik.vm.appimageformat", app_image_format, NULL) > 0;
-      // Use app images only if it is enabled (by a set image format) and we are compiling
-      // profile-guided (so the app image doesn't conservatively contain all classes).
-      if (profile_guided && have_app_image_format) {
-          // Recreate is true since we do not want to modify a mapped image. If the app is already
-          // running and we modify the image file, it can cause crashes (b/27493510).
-          image_fd = open_output_file(image_path, /*recreate*/true, /*permissions*/0600);
-          if (image_fd < 0) {
-              // Could not create application image file. Go on since we can compile without it.
-              ALOGE("installd could not create '%s' for image file during dexopt\n", image_path);
-          } else if (!set_permissions_and_ownership(image_fd, is_public, uid, image_path)) {
-              image_fd = -1;
-          }
-      }
-      // If we have a valid image file path but no image fd, erase the image file.
-      if (image_fd < 0) {
-          if (unlink(image_path) < 0) {
-              if (errno != ENOENT) {
-                  PLOG(ERROR) << "Couldn't unlink image file " << image_path;
-              }
-          }
-      }
+    Dex2oatFileWrapper<std::function<void ()>> image_fd;
+    const std::string image_path = create_image_filename(out_path);
+    if (!image_path.empty()) {
+        char app_image_format[kPropertyValueMax];
+        bool have_app_image_format =
+                get_property("dalvik.vm.appimageformat", app_image_format, NULL) > 0;
+        // Use app images only if it is enabled (by a set image format) and we are compiling
+        // profile-guided (so the app image doesn't conservatively contain all classes).
+        if (profile_guided && have_app_image_format) {
+            // Recreate is true since we do not want to modify a mapped image. If the app is
+            // already running and we modify the image file, it can cause crashes (b/27493510).
+            image_fd.reset(open_output_file(image_path.c_str(),
+                                            true /*recreate*/,
+                                            0600 /*permissions*/),
+                           [image_path]() { unlink(image_path.c_str()); }
+                           );
+            if (image_fd.get() < 0) {
+                // Could not create application image file. Go on since we can compile without
+                // it.
+                LOG(ERROR) << "installd could not create '"
+                        << image_path
+                        << "' for image file during dexopt";
+            } else if (!set_permissions_and_ownership(image_fd.get(),
+                                                      is_public,
+                                                      uid,
+                                                      image_path.c_str())) {
+                image_fd.reset(-1);
+            }
+        }
+        // If we have a valid image file path but no image fd, explicitly erase the image file.
+        if (image_fd.get() < 0) {
+            if (unlink(image_path.c_str()) < 0) {
+                if (errno != ENOENT) {
+                    PLOG(ERROR) << "Couldn't unlink image file " << image_path;
+                }
+            }
+        }
     }
 
     ALOGV("DexInv: --- BEGIN '%s' ---\n", input_file);
 
-    pid_t pid;
-    pid = fork();
+    pid_t pid = fork();
     if (pid == 0) {
         /* child -- drop privileges before continuing */
         drop_capabilities(uid);
 
         SetDex2OatAndPatchOatScheduling(boot_complete);
-        if (flock(out_fd, LOCK_EX | LOCK_NB) != 0) {
+        if (flock(out_fd.get(), LOCK_EX | LOCK_NB) != 0) {
             ALOGE("flock(%s) failed: %s\n", out_path, strerror(errno));
-            exit(67);
+            _exit(67);
         }
 
         if (dexopt_needed == DEXOPT_PATCHOAT_NEEDED
             || dexopt_needed == DEXOPT_SELF_PATCHOAT_NEEDED) {
-            run_patchoat(input_fd, out_fd, input_file, out_path, pkgname, instruction_set);
+            run_patchoat(input_fd.get(),
+                         out_fd.get(),
+                         input_file,
+                         out_path,
+                         pkgname,
+                         instruction_set);
         } else if (dexopt_needed == DEXOPT_DEX2OAT_NEEDED) {
             // Pass dex2oat the relative path to the input file.
             const char *input_file_name = get_location_from_path(input_file);
-            run_dex2oat(input_fd, out_fd, image_fd, input_file_name, out_path, swap_fd,
-                        instruction_set, compiler_filter, vm_safe_mode, debuggable, boot_complete,
-                        reference_profile_fd, shared_libraries);
+            run_dex2oat(input_fd.get(),
+                        out_fd.get(),
+                        image_fd.get(),
+                        input_file_name,
+                        out_path,
+                        swap_fd.get(),
+                        instruction_set,
+                        compiler_filter,
+                        vm_safe_mode,
+                        debuggable,
+                        boot_complete,
+                        reference_profile_fd.get(),
+                        shared_libraries);
         } else {
             ALOGE("Invalid dexopt needed: %d\n", dexopt_needed);
-            exit(73);
+            _exit(73);
         }
-        exit(68);   /* only get here on exec failure */
+        _exit(68);   /* only get here on exec failure */
     } else {
-        res = wait_child(pid);
+        int res = wait_child(pid);
         if (res == 0) {
             ALOGV("DexInv: --- END '%s' (success) ---\n", input_file);
         } else {
             ALOGE("DexInv: --- END '%s' --- status=0x%04x, process failed\n", input_file, res);
-            goto fail;
+            return -1;
         }
     }
 
+    struct utimbuf ut;
     ut.actime = input_stat.st_atime;
     ut.modtime = input_stat.st_mtime;
     utime(out_path, &ut);
 
-    close(out_fd);
-    close(input_fd);
-    if (swap_fd >= 0) {
-        close(swap_fd);
-    }
-    if (reference_profile_fd >= 0) {
-        close(reference_profile_fd);
-    }
-    if (image_fd >= 0) {
-        close(image_fd);
-    }
-    return 0;
+    // We've been successful, don't delete output.
+    out_fd.SetCleanup(false);
+    image_fd.SetCleanup(false);
+    reference_profile_fd.SetCleanup(false);
 
-fail:
-    if (out_fd >= 0) {
-        close(out_fd);
-        unlink(out_path);
-    }
-    if (input_fd >= 0) {
-        close(input_fd);
-    }
-    if (reference_profile_fd >= 0) {
-        close(reference_profile_fd);
-        // We failed to compile. Unlink the reference profile. Current profiles are already unlinked
-        // when profmoan advises compilation.
-        clear_reference_profile(pkgname);
-    }
-    if (swap_fd >= 0) {
-        close(swap_fd);
-    }
-    if (image_fd >= 0) {
-        close(image_fd);
-    }
-    return -1;
+    return 0;
 }
 
 int mark_boot_complete(const char* instruction_set)
@@ -1926,6 +2044,37 @@
     return true;
 }
 
+// Move/rename a B artifact (from) to an A artifact (to).
+static bool move_ab_path(const std::string& b_path, const std::string& a_path) {
+    // Check whether B exists.
+    {
+        struct stat s;
+        if (stat(b_path.c_str(), &s) != 0) {
+            // Silently ignore for now. The service calling this isn't smart enough to understand
+            // lack of artifacts at the moment.
+            return false;
+        }
+        if (!S_ISREG(s.st_mode)) {
+            LOG(ERROR) << "A/B artifact " << b_path << " is not a regular file.";
+            // Try to unlink, but swallow errors.
+            unlink(b_path.c_str());
+            return false;
+        }
+    }
+
+    // Rename B to A.
+    if (!unlink_and_rename(b_path.c_str(), a_path.c_str())) {
+        // Delete the b_path so we don't try again (or fail earlier).
+        if (unlink(b_path.c_str()) != 0) {
+            PLOG(ERROR) << "Could not unlink " << b_path;
+        }
+
+        return false;
+    }
+
+    return true;
+}
+
 int move_ab(const char* apk_path, const char* instruction_set, const char* oat_dir) {
     if (apk_path == nullptr || instruction_set == nullptr || oat_dir == nullptr) {
         LOG(ERROR) << "Cannot move_ab with null input";
@@ -1944,37 +2093,35 @@
     if (!calculate_oat_file_path(a_path, oat_dir, apk_path, instruction_set)) {
         return -1;
     }
+    const std::string a_image_path = create_image_filename(a_path);
 
     // B path = A path + ".b"
-    std::string b_path = StringPrintf("%s.b", a_path);
+    const std::string b_path = StringPrintf("%s.b", a_path);
+    const std::string b_image_path = StringPrintf("%s.b", a_image_path.c_str());
 
-    // Check whether B exists.
-    {
-        struct stat s;
-        if (stat(b_path.c_str(), &s) != 0) {
-            // Silently ignore for now. The service calling this isn't smart enough to understand
-            // lack of artifacts at the moment.
-            return -1;
+    bool oat_success = move_ab_path(b_path, a_path);
+    bool success;
+
+    if (oat_success) {
+        // Note: we can live without an app image. As such, ignore failure to move the image file.
+        //       If we decide to require the app image, or the app image being moved correctly,
+        //       then change accordingly.
+        constexpr bool kIgnoreAppImageFailure = true;
+
+        bool art_success = true;
+        if (!a_image_path.empty()) {
+            art_success = move_ab_path(b_image_path, a_image_path);
         }
-        if (!S_ISREG(s.st_mode)) {
-            LOG(ERROR) << "A/B artifact " << b_path << " is not a regular file.";
-            // Try to unlink, but swallow errors.
-            unlink(b_path.c_str());
-            return -1;
-        }
+
+        success = art_success || kIgnoreAppImageFailure;
+    } else {
+        // Cleanup: delete B image, ignore errors.
+        unlink(b_image_path.c_str());
+
+        success = false;
     }
 
-    // Rename B to A.
-    if (!unlink_and_rename(b_path.c_str(), a_path)) {
-        // Delete the b_path so we don't try again (or fail earlier).
-        if (unlink(b_path.c_str()) != 0) {
-            PLOG(ERROR) << "Could not unlink " << b_path;
-        }
-
-        return -1;
-    }
-
-    return 0;
+    return success ? 0 : -1;
 }
 
 }  // namespace installd
diff --git a/cmds/installd/commands.h b/cmds/installd/commands.h
index 7a42c5c..c0c39c5 100644
--- a/cmds/installd/commands.h
+++ b/cmds/installd/commands.h
@@ -56,9 +56,21 @@
 
 bool dump_profile(uid_t uid, const char *pkgname, const char *dex_files);
 
-int dexopt(const char *apk_path, uid_t uid, const char *pkgName, const char *instruction_set,
-           int dexopt_needed, const char* oat_dir, int dexopt_flags, const char* compiler_filter,
-           const char* volume_uuid, const char* shared_libraries);
+int dexopt(const char *apk_path,
+           uid_t uid,
+           const char *pkgName,
+           const char *instruction_set,
+           int dexopt_needed,
+           const char* oat_dir,
+           int dexopt_flags,
+           const char* compiler_filter,
+           const char* volume_uuid,
+           const char* shared_libraries);
+static_assert(DEXOPT_PARAM_COUNT == 10U, "Unexpected dexopt param size");
+
+// Helper for the above, converting arguments.
+int dexopt(const char* params[DEXOPT_PARAM_COUNT]);
+
 int mark_boot_complete(const char *instruction_set);
 int linklib(const char* uuid, const char* pkgname, const char* asecLibDir, int userId);
 int idmap(const char *target_path, const char *overlay_path, uid_t uid);
diff --git a/cmds/installd/installd.cpp b/cmds/installd/installd.cpp
index 061359e..9d2f71b 100644
--- a/cmds/installd/installd.cpp
+++ b/cmds/installd/installd.cpp
@@ -219,7 +219,8 @@
 // We use otapreopt_chroot to get into the chroot.
 static constexpr const char* kOtaPreopt = "/system/bin/otapreopt_chroot";
 
-static int do_ota_dexopt(char **arg, char reply[REPLY_MAX] ATTRIBUTE_UNUSED) {
+static int do_ota_dexopt(const char* args[DEXOPT_PARAM_COUNT],
+                         char reply[REPLY_MAX] ATTRIBUTE_UNUSED) {
     // Time to fork and run otapreopt.
 
     // Check that the tool exists.
@@ -231,12 +232,14 @@
 
     pid_t pid = fork();
     if (pid == 0) {
-        const char* argv[1 + 9 + 1];
+        const char* argv[1 + DEXOPT_PARAM_COUNT + 1];
         argv[0] = kOtaPreopt;
-        for (size_t i = 1; i <= 9; ++i) {
-            argv[i] = arg[i - 1];
+
+        for (size_t i = 0; i < DEXOPT_PARAM_COUNT; ++i) {
+            argv[i + 1] = args[i];
         }
-        argv[10] = nullptr;
+
+        argv[DEXOPT_PARAM_COUNT + 1] = nullptr;
 
         execv(argv[0], (char * const *)argv);
         PLOG(ERROR) << "execv(OTAPREOPT_CHROOT) failed";
@@ -252,22 +255,30 @@
     }
 }
 
+static int do_regular_dexopt(const char* args[DEXOPT_PARAM_COUNT],
+                             char reply[REPLY_MAX] ATTRIBUTE_UNUSED) {
+    return dexopt(args);
+}
+
+using DexoptFn = int (*)(const char* args[DEXOPT_PARAM_COUNT],
+                         char reply[REPLY_MAX]);
+
 static int do_dexopt(char **arg, char reply[REPLY_MAX])
 {
-    int dexopt_flags = atoi(arg[6]);
-    if ((dexopt_flags & DEXOPT_OTA) != 0) {
-      return do_ota_dexopt(arg, reply);
+    const char* args[DEXOPT_PARAM_COUNT];
+    for (size_t i = 0; i < DEXOPT_PARAM_COUNT; ++i) {
+        CHECK(arg[i] != nullptr);
+        args[i] = arg[i];
     }
-    return dexopt(arg[0],                      // apk_path
-                  atoi(arg[1]),                // uid
-                  arg[2],                      // pkgname
-                  arg[3],                      // instruction_set
-                  atoi(arg[4]),                // dexopt_needed
-                  arg[5],                      // oat_dir
-                  dexopt_flags,
-                  arg[7],                      // compiler_filter
-                  parse_null(arg[8]),          // volume_uuid
-                  parse_null(arg[9]));         // shared_libraries
+
+    int dexopt_flags = atoi(arg[6]);
+    DexoptFn dexopt_fn;
+    if ((dexopt_flags & DEXOPT_OTA) != 0) {
+        dexopt_fn = do_ota_dexopt;
+    } else {
+        dexopt_fn = do_regular_dexopt;
+    }
+    return dexopt_fn(args, reply);
 }
 
 static int do_merge_profiles(char **arg, char reply[REPLY_MAX])
diff --git a/cmds/installd/installd_constants.h b/cmds/installd/installd_constants.h
index 8513695..823b8ee 100644
--- a/cmds/installd/installd_constants.h
+++ b/cmds/installd/installd_constants.h
@@ -21,6 +21,8 @@
 namespace android {
 namespace installd {
 
+constexpr size_t DEXOPT_PARAM_COUNT = 10U;
+
 /* elements combined with a valid package name to form paths */
 
 constexpr const char* PRIMARY_USER_PREFIX = "data/";
diff --git a/cmds/installd/otapreopt.cpp b/cmds/installd/otapreopt.cpp
index ac511ec..e1cfc9d 100644
--- a/cmds/installd/otapreopt.cpp
+++ b/cmds/installd/otapreopt.cpp
@@ -30,6 +30,7 @@
 #include <android-base/logging.h>
 #include <android-base/macros.h>
 #include <android-base/stringprintf.h>
+#include <android-base/strings.h>
 #include <cutils/fs.h>
 #include <cutils/log.h>
 #include <cutils/properties.h>
@@ -39,7 +40,6 @@
 #include <file_parsing.h>
 #include <globals.h>
 #include <installd_deps.h>  // Need to fill in requirements of commands.
-#include <string_helpers.h>
 #include <system_properties.h>
 #include <utils.h>
 
@@ -51,6 +51,10 @@
 #define TOKEN_MAX     16    /* max number of arguments in buffer */
 #define REPLY_MAX     256   /* largest reply allowed */
 
+using android::base::EndsWith;
+using android::base::Join;
+using android::base::Split;
+using android::base::StartsWith;
 using android::base::StringPrintf;
 
 namespace android {
@@ -188,12 +192,14 @@
 
     bool ReadPackage(int argc ATTRIBUTE_UNUSED, char** argv) {
         size_t index = 0;
-        while (index < ARRAY_SIZE(package_parameters_) &&
+        static_assert(DEXOPT_PARAM_COUNT == ARRAY_SIZE(package_parameters_),
+                      "Unexpected dexopt param count");
+        while (index < DEXOPT_PARAM_COUNT &&
                 argv[index + 1] != nullptr) {
             package_parameters_[index] = argv[index + 1];
             index++;
         }
-        if (index != ARRAY_SIZE(package_parameters_)) {
+        if (index != ARRAY_SIZE(package_parameters_) || argv[index + 1] != nullptr) {
             LOG(ERROR) << "Wrong number of parameters";
             return false;
         }
@@ -295,7 +301,7 @@
         std::vector<std::string> cmd;
         cmd.push_back("/system/bin/dex2oat");
         cmd.push_back(StringPrintf("--image=%s", art_path.c_str()));
-        for (const std::string& boot_part : Split(boot_cp, ':')) {
+        for (const std::string& boot_part : Split(boot_cp, ":")) {
             cmd.push_back(StringPrintf("--dex-file=%s", boot_part.c_str()));
         }
         cmd.push_back(StringPrintf("--oat-file=%s", oat_path.c_str()));
@@ -324,7 +330,7 @@
         const std::string* extra_opts =
                 system_properties_.GetProperty("dalvik.vm.image-dex2oat-flags");
         if (extra_opts != nullptr) {
-            std::vector<std::string> extra_vals = Split(*extra_opts, ' ');
+            std::vector<std::string> extra_vals = Split(*extra_opts, " ");
             cmd.insert(cmd.end(), extra_vals.begin(), extra_vals.end());
         }
         // TODO: Should we lower this? It's usually set close to max, because
@@ -357,17 +363,50 @@
     }
 
     int RunPreopt() {
-        int ret = dexopt(package_parameters_[0],          // apk_path
-                atoi(package_parameters_[1]),             // uid
-                package_parameters_[2],                   // pkgname
-                package_parameters_[3],                   // instruction_set
-                atoi(package_parameters_[4]),             // dexopt_needed
-                package_parameters_[5],                   // oat_dir
-                atoi(package_parameters_[6]),             // dexopt_flags
-                package_parameters_[7],                   // compiler_filter
-                ParseNull(package_parameters_[8]),        // volume_uuid
-                ParseNull(package_parameters_[9]));       // shared_libraries
-        return ret;
+        // Run the preopt.
+        //
+        // There's one thing we have to be careful about: we may/will be asked to compile an app
+        // living in the system image. This may be a valid request - if the app wasn't compiled,
+        // e.g., if the system image wasn't large enough to include preopted files. However, the
+        // data we have is from the old system, so the driver (the OTA service) can't actually
+        // know. Thus, we will get requests for apps that have preopted components. To avoid
+        // duplication (we'd generate files that are not used and are *not* cleaned up), do two
+        // simple checks:
+        //
+        // 1) Does the apk_path start with the value of ANDROID_ROOT? (~in the system image)
+        //    (For simplicity, assume the value of ANDROID_ROOT does not contain a symlink.)
+        //
+        // 2) If you replace the name in the apk_path with "oat," does the path exist?
+        //    (=have a subdirectory for preopted files)
+        //
+        // If the answer to both is yes, skip the dexopt.
+        //
+        // Note: while one may think it's OK to call dexopt and it will fail (because APKs should
+        //       be stripped), that's not true for APKs signed outside the build system (so the
+        //       jar content must be exactly the same).
+
+        //       (This is ugly as it's the only thing where we need to understand the contents
+        //        of package_parameters_, but it beats postponing the decision or using the call-
+        //        backs to do weird things.)
+        constexpr size_t kApkPathIndex = 0;
+        CHECK_GT(DEXOPT_PARAM_COUNT, kApkPathIndex);
+        CHECK(package_parameters_[kApkPathIndex] != nullptr);
+        CHECK(system_properties_.GetProperty(kAndroidRootPathPropertyName) != nullptr);
+        if (StartsWith(package_parameters_[kApkPathIndex],
+                       system_properties_.GetProperty(kAndroidRootPathPropertyName)->c_str())) {
+            const char* last_slash = strrchr(package_parameters_[kApkPathIndex], '/');
+            if (last_slash != nullptr) {
+                std::string path(package_parameters_[kApkPathIndex],
+                                 last_slash - package_parameters_[kApkPathIndex] + 1);
+                CHECK(EndsWith(path, "/"));
+                path = path + "oat";
+                if (access(path.c_str(), F_OK) == 0) {
+                    return 0;
+                }
+            }
+        }
+
+        return dexopt(package_parameters_);
     }
 
     ////////////////////////////////////
@@ -376,7 +415,7 @@
 
     // Wrapper on fork/execv to run a command in a subprocess.
     bool Exec(const std::vector<std::string>& arg_vector, std::string* error_msg) {
-        const std::string command_line(Join(arg_vector, ' '));
+        const std::string command_line = Join(arg_vector, ' ');
 
         CHECK_GE(arg_vector.size(), 1U) << command_line;
 
@@ -484,7 +523,7 @@
     // to compile, instead of the A properties we could get from init/get_property.
     SystemProperties system_properties_;
 
-    const char* package_parameters_[10];
+    const char* package_parameters_[DEXOPT_PARAM_COUNT];
 
     // Store environment values we need to set.
     std::vector<std::string> environ_;
@@ -497,7 +536,6 @@
 ////////////////////////
 
 int get_property(const char *key, char *value, const char *default_value) {
-    // TODO: Replace with system-properties map.
     return gOps.GetProperty(key, value, default_value);
 }
 
@@ -505,9 +543,8 @@
 bool calculate_oat_file_path(char path[PKG_PATH_MAX], const char *oat_dir,
                              const char *apk_path,
                              const char *instruction_set) {
-    // TODO: Insert B directory.
-    char *file_name_start;
-    char *file_name_end;
+    const char *file_name_start;
+    const char *file_name_end;
 
     file_name_start = strrchr(apk_path, '/');
     if (file_name_start == nullptr) {
diff --git a/cmds/installd/otapreopt_chroot.cpp b/cmds/installd/otapreopt_chroot.cpp
index f7f69a9..be0ff2e 100644
--- a/cmds/installd/otapreopt_chroot.cpp
+++ b/cmds/installd/otapreopt_chroot.cpp
@@ -22,6 +22,8 @@
 #include <android-base/macros.h>
 #include <android-base/stringprintf.h>
 
+#include <installd_constants.h>
+
 #ifndef LOG_TAG
 #define LOG_TAG "otapreopt"
 #endif
@@ -78,13 +80,13 @@
 
     // Now go on and run otapreopt.
 
-    const char* argv[1 + 9 + 1];
-    CHECK_EQ(argc, 10);
+    const char* argv[1 + DEXOPT_PARAM_COUNT + 1];
+    CHECK_EQ(static_cast<size_t>(argc), DEXOPT_PARAM_COUNT + 1);
     argv[0] = "/system/bin/otapreopt";
-    for (size_t i = 1; i <= 9; ++i) {
+    for (size_t i = 1; i <= DEXOPT_PARAM_COUNT; ++i) {
         argv[i] = arg[i];
     }
-    argv[10] = nullptr;
+    argv[DEXOPT_PARAM_COUNT + 1] = nullptr;
 
     execv(argv[0], (char * const *)argv);
     PLOG(ERROR) << "execv(OTAPREOPT) failed.";
diff --git a/cmds/installd/otapreopt_script.sh b/cmds/installd/otapreopt_script.sh
index a31734a..394c244 100644
--- a/cmds/installd/otapreopt_script.sh
+++ b/cmds/installd/otapreopt_script.sh
@@ -18,24 +18,33 @@
 
 # This script will run as a postinstall step to drive otapreopt.
 
+STATUS_FD="$2"
+
 # Maximum number of packages/steps.
 MAXIMUM_PACKAGES=1000
 
 PREPARE=$(cmd otadexopt prepare)
-if [ "$PREPARE" != "Success" ] ; then
-  echo "Failed to prepare."
-  exit 1
-fi
+# Note: Ignore preparation failures. Step and done will fail and exit this.
+#       This is necessary to support suspends - the OTA service will keep
+#       the state around for us.
+
+PROGRESS=$(cmd otadexopt progress)
+print -u${STATUS_FD} "global_progress $PROGRESS"
 
 i=0
 while ((i<MAXIMUM_PACKAGES)) ; do
   cmd otadexopt step
+
+  PROGRESS=$(cmd otadexopt progress)
+  print -u${STATUS_FD} "global_progress $PROGRESS"
+
   DONE=$(cmd otadexopt done)
-  if [ "$DONE" = "OTA complete." ] ; then
-    break
+  if [ "$DONE" = "OTA incomplete." ] ; then
+    sleep 1
+    i=$((i+1))
+    continue
   fi
-  sleep 1
-  i=$((i+1))
+  break
 done
 
 DONE=$(cmd otadexopt done)
@@ -45,6 +54,7 @@
   echo "Complete or error."
 fi
 
+print -u${STATUS_FD} "global_progress 1.0"
 cmd otadexopt cleanup
 
 exit 0
diff --git a/cmds/installd/string_helpers.h b/cmds/installd/string_helpers.h
deleted file mode 100644
index e8fcdef..0000000
--- a/cmds/installd/string_helpers.h
+++ /dev/null
@@ -1,67 +0,0 @@
-/*
- * Copyright (C) 2015 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef ART_OTAPREOPT_STRING_HELPERS_H_
-#define ART_OTAPREOPT_STRING_HELPERS_H_
-
-#include <sstream>
-#include <string>
-
-#include <android-base/macros.h>
-
-namespace android {
-namespace installd {
-
-static inline bool StringStartsWith(const std::string& target,
-                                    const char* prefix) {
-    return target.compare(0, strlen(prefix), prefix) == 0;
-}
-
-// Split the input according to the separator character. Doesn't honor quotation.
-static inline std::vector<std::string> Split(const std::string& in, const char separator) {
-    if (in.empty()) {
-        return std::vector<std::string>();
-    }
-
-    std::vector<std::string> ret;
-    std::stringstream strstr(in);
-    std::string token;
-
-    while (std::getline(strstr, token, separator)) {
-        ret.push_back(token);
-    }
-
-    return ret;
-}
-
-template <typename StringT>
-static inline std::string Join(const std::vector<StringT>& strings, char separator) {
-    if (strings.empty()) {
-        return "";
-    }
-
-    std::string result(strings[0]);
-    for (size_t i = 1; i < strings.size(); ++i) {
-        result += separator;
-        result += strings[i];
-    }
-    return result;
-}
-
-}  // namespace installd
-}  // namespace android
-
-#endif  // ART_OTAPREOPT_STRING_HELPERS_H_
diff --git a/data/etc/wearable_core_hardware.xml b/data/etc/wearable_core_hardware.xml
index 4b7a706..4ff00b5 100644
--- a/data/etc/wearable_core_hardware.xml
+++ b/data/etc/wearable_core_hardware.xml
@@ -34,7 +34,6 @@
 
     <!-- device administration -->
     <feature name="android.software.device_admin" />
-    <feature name="android.software.managed_users" />
 
     <!-- devices with GPS must include device/google/clockwork/gps.xml -->
     <!-- devices with an autofocus camera and/or flash must include either
diff --git a/include/android/keycodes.h b/include/android/keycodes.h
index 67e28da..a17c57a 100644
--- a/include/android/keycodes.h
+++ b/include/android/keycodes.h
@@ -757,7 +757,15 @@
     /** Copy key. */
     AKEYCODE_COPY = 278,
     /** Paste key. */
-    AKEYCODE_PASTE = 279
+    AKEYCODE_PASTE = 279,
+    /** fingerprint navigation key, up. */
+    AKEYCODE_FP_NAV_UP = 280,
+    /** fingerprint navigation key, down. */
+    AKEYCODE_FP_NAV_DOWN = 281,
+    /** fingerprint navigation key, left. */
+    AKEYCODE_FP_NAV_LEFT = 282,
+    /** fingerprint navigation key, right. */
+    AKEYCODE_FP_NAV_RIGHT = 283
 
     // NOTE: If you add a new keycode here you must also add it to several other files.
     //       Refer to frameworks/base/core/java/android/view/KeyEvent.java for the full list.
diff --git a/include/gui/BufferQueue.h b/include/gui/BufferQueue.h
index 09300a2..fe4b1fa 100644
--- a/include/gui/BufferQueue.h
+++ b/include/gui/BufferQueue.h
@@ -66,6 +66,8 @@
         virtual void onFrameReplaced(const BufferItem& item) override;
         virtual void onBuffersReleased() override;
         virtual void onSidebandStreamChanged() override;
+        virtual bool getFrameTimestamps(uint64_t frameNumber,
+                FrameTimestamps* outTimestamps) const override;
     private:
         // mConsumerListener is a weak reference to the IConsumerListener.  This is
         // the raison d'etre of ProxyConsumerListener.
diff --git a/include/gui/BufferQueueConsumer.h b/include/gui/BufferQueueConsumer.h
index b2daae4..a9fce1a 100644
--- a/include/gui/BufferQueueConsumer.h
+++ b/include/gui/BufferQueueConsumer.h
@@ -136,6 +136,10 @@
     // Retrieve the sideband buffer stream, if any.
     virtual sp<NativeHandle> getSidebandStream() const;
 
+    // See IGraphicBufferConsumer::getOccupancyHistory
+    virtual status_t getOccupancyHistory(bool forceFlush,
+            std::vector<OccupancyTracker::Segment>* outHistory) override;
+
     // dump our state in a String
     virtual void dump(String8& result, const char* prefix) const;
 
diff --git a/include/gui/BufferQueueCore.h b/include/gui/BufferQueueCore.h
index 4337da9..6c69d69 100644
--- a/include/gui/BufferQueueCore.h
+++ b/include/gui/BufferQueueCore.h
@@ -20,6 +20,7 @@
 #include <gui/BufferItem.h>
 #include <gui/BufferQueueDefs.h>
 #include <gui/BufferSlot.h>
+#include <gui/OccupancyTracker.h>
 
 #include <utils/Condition.h>
 #include <utils/Mutex.h>
@@ -322,6 +323,8 @@
     // The slot of the last queued buffer
     int mLastQueuedSlot;
 
+    OccupancyTracker mOccupancyTracker;
+
 }; // class BufferQueueCore
 
 } // namespace android
diff --git a/include/gui/BufferQueueProducer.h b/include/gui/BufferQueueProducer.h
index a75ed98..a85bbb7 100644
--- a/include/gui/BufferQueueProducer.h
+++ b/include/gui/BufferQueueProducer.h
@@ -186,6 +186,10 @@
     virtual status_t getLastQueuedBuffer(sp<GraphicBuffer>* outBuffer,
             sp<Fence>* outFence, float outTransformMatrix[16]) override;
 
+    // See IGraphicBufferProducer::getFrameTimestamps
+    virtual bool getFrameTimestamps(uint64_t frameNumber,
+            FrameTimestamps* outTimestamps) const override;
+
 private:
     // This is required by the IBinder::DeathRecipient interface
     virtual void binderDied(const wp<IBinder>& who);
diff --git a/include/gui/ConsumerBase.h b/include/gui/ConsumerBase.h
index 9307a26..d1f4cdd 100644
--- a/include/gui/ConsumerBase.h
+++ b/include/gui/ConsumerBase.h
@@ -85,6 +85,10 @@
     // See IGraphicBufferConsumer::setDefaultBufferDataSpace
     status_t setDefaultBufferDataSpace(android_dataspace defaultDataSpace);
 
+    // See IGraphicBufferConsumer::getOccupancyHistory
+    status_t getOccupancyHistory(bool forceFlush,
+            std::vector<OccupancyTracker::Segment>* outHistory);
+
 private:
     ConsumerBase(const ConsumerBase&);
     void operator=(const ConsumerBase&);
diff --git a/include/gui/FrameTimestamps.h b/include/gui/FrameTimestamps.h
new file mode 100644
index 0000000..4dc7467
--- /dev/null
+++ b/include/gui/FrameTimestamps.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_GUI_FRAMETIMESTAMPS_H
+#define ANDROID_GUI_FRAMETIMESTAMPS_H
+
+#include <utils/Timers.h>
+#include <utils/Flattenable.h>
+
+namespace android {
+
+struct FrameTimestamps : public LightFlattenablePod<FrameTimestamps> {
+    FrameTimestamps() :
+        frameNumber(0),
+        postedTime(0),
+        acquireTime(0),
+        refreshStartTime(0),
+        glCompositionDoneTime(0),
+        displayRetireTime(0),
+        releaseTime(0) {}
+
+    uint64_t frameNumber;
+    nsecs_t postedTime;
+    nsecs_t acquireTime;
+    nsecs_t refreshStartTime;
+    nsecs_t glCompositionDoneTime;
+    nsecs_t displayRetireTime;
+    nsecs_t releaseTime;
+};
+
+} // namespace android
+#endif
diff --git a/include/gui/IConsumerListener.h b/include/gui/IConsumerListener.h
index 3f39799..1efcf3c 100644
--- a/include/gui/IConsumerListener.h
+++ b/include/gui/IConsumerListener.h
@@ -25,6 +25,8 @@
 
 #include <binder/IInterface.h>
 
+#include <gui/FrameTimestamps.h>
+
 namespace android {
 // ----------------------------------------------------------------------------
 
@@ -78,6 +80,11 @@
     // stream is first attached and when it is either detached or replaced by a
     // different stream.
     virtual void onSidebandStreamChanged() = 0; /* Asynchronous */
+
+    // See IGraphicBufferProducer::getFrameTimestamps
+    // This queries the consumer for the timestamps
+    virtual bool getFrameTimestamps(uint64_t /*frameNumber*/,
+            FrameTimestamps* /*outTimestamps*/) const { return false; }
 };
 
 
diff --git a/include/gui/IGraphicBufferConsumer.h b/include/gui/IGraphicBufferConsumer.h
index e983c16..4915478 100644
--- a/include/gui/IGraphicBufferConsumer.h
+++ b/include/gui/IGraphicBufferConsumer.h
@@ -27,6 +27,7 @@
 #include <binder/IInterface.h>
 #include <ui/PixelFormat.h>
 #include <ui/Rect.h>
+#include <gui/OccupancyTracker.h>
 
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
@@ -265,6 +266,12 @@
     // Retrieve the sideband buffer stream, if any.
     virtual sp<NativeHandle> getSidebandStream() const = 0;
 
+    // Retrieves any stored segments of the occupancy history of this
+    // BufferQueue and clears them. Optionally closes out the pending segment if
+    // forceFlush is true.
+    virtual status_t getOccupancyHistory(bool forceFlush,
+            std::vector<OccupancyTracker::Segment>* outHistory) = 0;
+
     // dump state into a string
     virtual void dump(String8& result, const char* prefix) const = 0;
 
diff --git a/include/gui/IGraphicBufferProducer.h b/include/gui/IGraphicBufferProducer.h
index 37ae6df..0c24606 100644
--- a/include/gui/IGraphicBufferProducer.h
+++ b/include/gui/IGraphicBufferProducer.h
@@ -30,6 +30,8 @@
 #include <ui/Rect.h>
 #include <ui/Region.h>
 
+#include <gui/FrameTimestamps.h>
+
 namespace android {
 // ----------------------------------------------------------------------------
 
@@ -568,6 +570,14 @@
     // Returns NO_ERROR or the status of the Binder transaction
     virtual status_t getLastQueuedBuffer(sp<GraphicBuffer>* outBuffer,
             sp<Fence>* outFence, float outTransformMatrix[16]) = 0;
+
+    // Attempts to retrieve timestamp information for the given frame number.
+    // If information for the given frame number is not found, returns false.
+    // Returns true otherwise.
+    //
+    // If a fence has not yet signaled the timestamp returned will be 0;
+    virtual bool getFrameTimestamps(uint64_t /*frameNumber*/,
+            FrameTimestamps* /*outTimestamps*/) const { return false; }
 };
 
 // ----------------------------------------------------------------------------
diff --git a/include/gui/OccupancyTracker.h b/include/gui/OccupancyTracker.h
new file mode 100644
index 0000000..1d15e7f
--- /dev/null
+++ b/include/gui/OccupancyTracker.h
@@ -0,0 +1,104 @@
+/*
+ * Copyright 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#ifndef ANDROID_GUI_OCCUPANCYTRACKER_H
+#define ANDROID_GUI_OCCUPANCYTRACKER_H
+
+#include <binder/Parcelable.h>
+
+#include <utils/Timers.h>
+
+#include <deque>
+#include <unordered_map>
+
+namespace android {
+
+class String8;
+
+class OccupancyTracker
+{
+public:
+    OccupancyTracker()
+      : mPendingSegment(),
+        mSegmentHistory(),
+        mLastOccupancy(0),
+        mLastOccupancyChangeTime(0) {}
+
+    struct Segment : public Parcelable {
+        Segment()
+          : totalTime(0),
+            numFrames(0),
+            occupancyAverage(0.0f),
+            usedThirdBuffer(false) {}
+
+        Segment(nsecs_t totalTime, size_t numFrames, float occupancyAverage,
+                bool usedThirdBuffer)
+          : totalTime(totalTime),
+            numFrames(numFrames),
+            occupancyAverage(occupancyAverage),
+            usedThirdBuffer(usedThirdBuffer) {}
+
+        // Parcelable interface
+        virtual status_t writeToParcel(Parcel* parcel) const override;
+        virtual status_t readFromParcel(const Parcel* parcel) override;
+
+        nsecs_t totalTime;
+        size_t numFrames;
+
+        // Average occupancy of the queue over this segment. (0.0, 1.0) implies
+        // double-buffered, (1.0, 2.0) implies triple-buffered.
+        float occupancyAverage;
+
+        // Whether a third buffer was used at all during this segment (since a
+        // segment could read as double-buffered on average, but still require a
+        // third buffer to avoid jank for some smaller portion)
+        bool usedThirdBuffer;
+    };
+
+    void registerOccupancyChange(size_t occupancy);
+    std::vector<Segment> getSegmentHistory(bool forceFlush);
+
+private:
+    static constexpr size_t MAX_HISTORY_SIZE = 10;
+    static constexpr nsecs_t NEW_SEGMENT_DELAY = ms2ns(100);
+    static constexpr size_t LONG_SEGMENT_THRESHOLD = 3;
+
+    struct PendingSegment {
+        void clear() {
+            totalTime = 0;
+            numFrames = 0;
+            mOccupancyTimes.clear();
+        }
+
+        nsecs_t totalTime;
+        size_t numFrames;
+        std::unordered_map<size_t, nsecs_t> mOccupancyTimes;
+    };
+
+    void recordPendingSegment();
+
+    PendingSegment mPendingSegment;
+    std::deque<Segment> mSegmentHistory;
+
+    size_t mLastOccupancy;
+    nsecs_t mLastOccupancyChangeTime;
+
+}; // class OccupancyTracker
+
+} // namespace android
+
+#endif
diff --git a/include/gui/Surface.h b/include/gui/Surface.h
index 646203b..7d9d901 100644
--- a/include/gui/Surface.h
+++ b/include/gui/Surface.h
@@ -134,6 +134,12 @@
     status_t getLastQueuedBuffer(sp<GraphicBuffer>* outBuffer,
             sp<Fence>* outFence, float outTransformMatrix[16]);
 
+    // See IGraphicBufferProducer::getFrameTimestamps
+    bool getFrameTimestamps(uint64_t frameNumber, nsecs_t* outPostedTime,
+            nsecs_t* outAcquireTime, nsecs_t* outRefreshStartTime,
+            nsecs_t* outGlCompositionDoneTime, nsecs_t* outDisplayRetireTime,
+            nsecs_t* outReleaseTime);
+
 protected:
     virtual ~Surface();
 
@@ -183,6 +189,7 @@
     int dispatchSetSurfaceDamage(va_list args);
     int dispatchSetSharedBufferMode(va_list args);
     int dispatchSetAutoRefresh(va_list args);
+    int dispatchGetFrameTimestamps(va_list args);
 
 protected:
     virtual int dequeueBuffer(ANativeWindowBuffer** buffer, int* fenceFd);
diff --git a/include/input/InputEventLabels.h b/include/input/InputEventLabels.h
index b7012eb..542f647 100644
--- a/include/input/InputEventLabels.h
+++ b/include/input/InputEventLabels.h
@@ -319,6 +319,10 @@
     DEFINE_KEYCODE(CUT),
     DEFINE_KEYCODE(COPY),
     DEFINE_KEYCODE(PASTE),
+    DEFINE_KEYCODE(FP_NAV_UP),
+    DEFINE_KEYCODE(FP_NAV_DOWN),
+    DEFINE_KEYCODE(FP_NAV_LEFT),
+    DEFINE_KEYCODE(FP_NAV_RIGHT),
 
     { NULL, 0 }
 };
diff --git a/libs/gui/Android.mk b/libs/gui/Android.mk
index 6e92a47..3e30bb2 100644
--- a/libs/gui/Android.mk
+++ b/libs/gui/Android.mk
@@ -64,6 +64,7 @@
 	ISurfaceComposer.cpp \
 	ISurfaceComposerClient.cpp \
 	LayerState.cpp \
+	OccupancyTracker.cpp \
 	Sensor.cpp \
 	SensorEventQueue.cpp \
 	SensorManager.cpp \
diff --git a/libs/gui/BufferQueue.cpp b/libs/gui/BufferQueue.cpp
index ccbb5a2..6de98f5 100644
--- a/libs/gui/BufferQueue.cpp
+++ b/libs/gui/BufferQueue.cpp
@@ -61,6 +61,15 @@
     }
 }
 
+bool BufferQueue::ProxyConsumerListener::getFrameTimestamps(
+        uint64_t frameNumber, FrameTimestamps* outTimestamps) const {
+    sp<ConsumerListener> listener(mConsumerListener.promote());
+    if (listener != NULL) {
+        return listener->getFrameTimestamps(frameNumber, outTimestamps);
+    }
+    return false;
+}
+
 void BufferQueue::createBufferQueue(sp<IGraphicBufferProducer>* outProducer,
         sp<IGraphicBufferConsumer>* outConsumer,
         const sp<IGraphicBufferAlloc>& allocator) {
diff --git a/libs/gui/BufferQueueConsumer.cpp b/libs/gui/BufferQueueConsumer.cpp
index cbc8893..e8860d1 100644
--- a/libs/gui/BufferQueueConsumer.cpp
+++ b/libs/gui/BufferQueueConsumer.cpp
@@ -260,6 +260,7 @@
         mCore->mDequeueCondition.broadcast();
 
         ATRACE_INT(mCore->mConsumerName.string(), mCore->mQueue.size());
+        mCore->mOccupancyTracker.registerOccupancyChange(mCore->mQueue.size());
 
         VALIDATE_CONSISTENCY();
     }
@@ -717,6 +718,13 @@
     return mCore->mSidebandStream;
 }
 
+status_t BufferQueueConsumer::getOccupancyHistory(bool forceFlush,
+        std::vector<OccupancyTracker::Segment>* outHistory) {
+    Mutex::Autolock lock(mCore->mMutex);
+    *outHistory = mCore->mOccupancyTracker.getSegmentHistory(forceFlush);
+    return NO_ERROR;
+}
+
 void BufferQueueConsumer::dump(String8& result, const char* prefix) const {
     const IPCThreadState* ipc = IPCThreadState::self();
     const pid_t pid = ipc->getCallingPid();
diff --git a/libs/gui/BufferQueueProducer.cpp b/libs/gui/BufferQueueProducer.cpp
index 69a408c..3a0a283 100644
--- a/libs/gui/BufferQueueProducer.cpp
+++ b/libs/gui/BufferQueueProducer.cpp
@@ -890,6 +890,7 @@
                 static_cast<uint32_t>(mCore->mQueue.size()));
 
         ATRACE_INT(mCore->mConsumerName.string(), mCore->mQueue.size());
+        mCore->mOccupancyTracker.registerOccupancyChange(mCore->mQueue.size());
 
         // Take a ticket for the callback functions
         callbackTicket = mNextCallbackTicket++;
@@ -1404,6 +1405,22 @@
     return NO_ERROR;
 }
 
+bool BufferQueueProducer::getFrameTimestamps(uint64_t frameNumber,
+        FrameTimestamps* outTimestamps) const {
+    ATRACE_CALL();
+    BQ_LOGV("getFrameTimestamps, %" PRIu64, frameNumber);
+    sp<IConsumerListener> listener;
+
+    {
+        Mutex::Autolock lock(mCore->mMutex);
+        listener = mCore->mConsumerListener;
+    }
+    if (listener != NULL) {
+        return listener->getFrameTimestamps(frameNumber, outTimestamps);
+    }
+    return false;
+}
+
 void BufferQueueProducer::binderDied(const wp<android::IBinder>& /* who */) {
     // If we're here, it means that a producer we were connected to died.
     // We're guaranteed that we are still connected to it because we remove
diff --git a/libs/gui/ConsumerBase.cpp b/libs/gui/ConsumerBase.cpp
index a6a9712..84965ef 100644
--- a/libs/gui/ConsumerBase.cpp
+++ b/libs/gui/ConsumerBase.cpp
@@ -235,6 +235,16 @@
     return mConsumer->setDefaultBufferDataSpace(defaultDataSpace);
 }
 
+status_t ConsumerBase::getOccupancyHistory(bool forceFlush,
+        std::vector<OccupancyTracker::Segment>* outHistory) {
+    Mutex::Autolock _l(mMutex);
+    if (mAbandoned) {
+        CB_LOGE("getOccupancyHistory: ConsumerBase is abandoned!");
+        return NO_INIT;
+    }
+    return mConsumer->getOccupancyHistory(forceFlush, outHistory);
+}
+
 void ConsumerBase::dump(String8& result) const {
     dump(result, "");
 }
diff --git a/libs/gui/IConsumerListener.cpp b/libs/gui/IConsumerListener.cpp
index cab7dc3..9a06011 100644
--- a/libs/gui/IConsumerListener.cpp
+++ b/libs/gui/IConsumerListener.cpp
@@ -31,6 +31,7 @@
     ON_FRAME_AVAILABLE = IBinder::FIRST_CALL_TRANSACTION,
     ON_BUFFER_RELEASED,
     ON_SIDEBAND_STREAM_CHANGED,
+    GET_FRAME_TIMESTAMPS
 };
 
 class BpConsumerListener : public BpInterface<IConsumerListener>
@@ -60,6 +61,42 @@
         data.writeInterfaceToken(IConsumerListener::getInterfaceDescriptor());
         remote()->transact(ON_SIDEBAND_STREAM_CHANGED, data, &reply, IBinder::FLAG_ONEWAY);
     }
+
+    virtual bool getFrameTimestamps(uint64_t frameNumber,
+            FrameTimestamps* outTimestamps) const {
+        Parcel data, reply;
+        status_t result = data.writeInterfaceToken(
+                IConsumerListener::getInterfaceDescriptor());
+        if (result != NO_ERROR) {
+            ALOGE("getFrameTimestamps failed to write token: %d", result);
+            return false;
+        }
+        result = data.writeUint64(frameNumber);
+        if (result != NO_ERROR) {
+            ALOGE("getFrameTimestamps failed to write: %d", result);
+            return false;
+        }
+        result = remote()->transact(GET_FRAME_TIMESTAMPS, data, &reply);
+        if (result != NO_ERROR) {
+            ALOGE("getFrameTimestamps failed to transact: %d", result);
+            return false;
+        }
+        bool found = false;
+        result = reply.readBool(&found);
+        if (result != NO_ERROR) {
+            ALOGE("getFrameTimestamps failed to read: %d", result);
+            return false;
+        }
+        if (found) {
+            result = reply.read(*outTimestamps);
+            if (result != NO_ERROR) {
+                ALOGE("getFrameTimestamps failed to read timestamps: %d",
+                        result);
+                return false;
+            }
+        }
+        return found;
+    }
 };
 
 // Out-of-line virtual method definition to trigger vtable emission in this
@@ -88,6 +125,30 @@
             CHECK_INTERFACE(IConsumerListener, data, reply);
             onSidebandStreamChanged();
             return NO_ERROR; }
+        case GET_FRAME_TIMESTAMPS: {
+            CHECK_INTERFACE(IConsumerListener, data, reply);
+            uint64_t frameNumber = 0;
+            status_t result = data.readUint64(&frameNumber);
+            if (result != NO_ERROR) {
+                ALOGE("onTransact failed to read: %d", result);
+                return result;
+            }
+            FrameTimestamps timestamps;
+            bool found = getFrameTimestamps(frameNumber, &timestamps);
+            result = reply->writeBool(found);
+            if (result != NO_ERROR) {
+                ALOGE("onTransact failed to write: %d", result);
+                return result;
+            }
+            if (found) {
+                result = reply->write(timestamps);
+                if (result != NO_ERROR) {
+                    ALOGE("onTransact failed to write timestamps: %d", result);
+                    return result;
+                }
+            }
+            return NO_ERROR;
+        }
     }
     return BBinder::onTransact(code, data, reply, flags);
 }
diff --git a/libs/gui/IGraphicBufferConsumer.cpp b/libs/gui/IGraphicBufferConsumer.cpp
index cb1ad35..7c4379f 100644
--- a/libs/gui/IGraphicBufferConsumer.cpp
+++ b/libs/gui/IGraphicBufferConsumer.cpp
@@ -51,6 +51,7 @@
     SET_CONSUMER_USAGE_BITS,
     SET_TRANSFORM_HINT,
     GET_SIDEBAND_STREAM,
+    GET_OCCUPANCY_HISTORY,
     DUMP,
 };
 
@@ -260,6 +261,31 @@
         return stream;
     }
 
+    virtual status_t getOccupancyHistory(bool forceFlush,
+            std::vector<OccupancyTracker::Segment>* outHistory) {
+        Parcel data, reply;
+        data.writeInterfaceToken(IGraphicBufferConsumer::getInterfaceDescriptor());
+        status_t error = data.writeBool(forceFlush);
+        if (error != NO_ERROR) {
+            return error;
+        }
+        error = remote()->transact(GET_OCCUPANCY_HISTORY, data,
+                &reply);
+        if (error != NO_ERROR) {
+            return error;
+        }
+        error = reply.readParcelableVector(outHistory);
+        if (error != NO_ERROR) {
+            return error;
+        }
+        status_t result = NO_ERROR;
+        error = reply.readInt32(&result);
+        if (error != NO_ERROR) {
+            return error;
+        }
+        return result;
+    }
+
     virtual void dump(String8& result, const char* prefix) const {
         Parcel data, reply;
         data.writeInterfaceToken(IGraphicBufferConsumer::getInterfaceDescriptor());
@@ -409,6 +435,25 @@
             }
             return NO_ERROR;
         }
+        case GET_OCCUPANCY_HISTORY: {
+            CHECK_INTERFACE(IGraphicBufferConsumer, data, reply);
+            bool forceFlush = false;
+            status_t error = data.readBool(&forceFlush);
+            if (error != NO_ERROR) {
+                return error;
+            }
+            std::vector<OccupancyTracker::Segment> history;
+            status_t result = getOccupancyHistory(forceFlush, &history);
+            error = reply->writeParcelableVector(history);
+            if (error != NO_ERROR) {
+                return error;
+            }
+            error = reply->writeInt32(result);
+            if (error != NO_ERROR) {
+                return error;
+            }
+            return NO_ERROR;
+        }
         case DUMP: {
             CHECK_INTERFACE(IGraphicBufferConsumer, data, reply);
             String8 result = data.readString8();
diff --git a/libs/gui/IGraphicBufferProducer.cpp b/libs/gui/IGraphicBufferProducer.cpp
index 2c48d83..9317eff 100644
--- a/libs/gui/IGraphicBufferProducer.cpp
+++ b/libs/gui/IGraphicBufferProducer.cpp
@@ -55,6 +55,7 @@
     SET_AUTO_REFRESH,
     SET_DEQUEUE_TIMEOUT,
     GET_LAST_QUEUED_BUFFER,
+    GET_FRAME_TIMESTAMPS
 };
 
 class BpGraphicBufferProducer : public BpInterface<IGraphicBufferProducer>
@@ -418,6 +419,42 @@
         *outFence = fence;
         return result;
     }
+
+    virtual bool getFrameTimestamps(uint64_t frameNumber,
+                FrameTimestamps* outTimestamps) const {
+        Parcel data, reply;
+        status_t result = data.writeInterfaceToken(
+                IGraphicBufferProducer::getInterfaceDescriptor());
+        if (result != NO_ERROR) {
+            ALOGE("getFrameTimestamps failed to write token: %d", result);
+            return false;
+        }
+        result = data.writeUint64(frameNumber);
+        if (result != NO_ERROR) {
+            ALOGE("getFrameTimestamps failed to write: %d", result);
+            return false;
+        }
+        result = remote()->transact(GET_FRAME_TIMESTAMPS, data, &reply);
+        if (result != NO_ERROR) {
+            ALOGE("getFrameTimestamps failed to transact: %d", result);
+            return false;
+        }
+        bool found = false;
+        result = reply.readBool(&found);
+        if (result != NO_ERROR) {
+            ALOGE("getFrameTimestamps failed to read: %d", result);
+            return false;
+        }
+        if (found) {
+            result = reply.read(*outTimestamps);
+            if (result != NO_ERROR) {
+                ALOGE("getFrameTimestamps failed to read timestamps: %d",
+                        result);
+                return false;
+            }
+        }
+        return found;
+    }
 };
 
 // Out-of-line virtual method definition to trigger vtable emission in this
@@ -659,6 +696,30 @@
             }
             return NO_ERROR;
         }
+        case GET_FRAME_TIMESTAMPS: {
+            CHECK_INTERFACE(IGraphicBufferProducer, data, reply);
+            uint64_t frameNumber = 0;
+            status_t result = data.readUint64(&frameNumber);
+            if (result != NO_ERROR) {
+                ALOGE("onTransact failed to read: %d", result);
+                return result;
+            }
+            FrameTimestamps timestamps;
+            bool found = getFrameTimestamps(frameNumber, &timestamps);
+            result = reply->writeBool(found);
+            if (result != NO_ERROR) {
+                ALOGE("onTransact failed to write: %d", result);
+                return result;
+            }
+            if (found) {
+                result = reply->write(timestamps);
+                if (result != NO_ERROR) {
+                    ALOGE("onTransact failed to write timestamps: %d", result);
+                    return result;
+                }
+            }
+            return NO_ERROR;
+        }
     }
     return BBinder::onTransact(code, data, reply, flags);
 }
diff --git a/libs/gui/OccupancyTracker.cpp b/libs/gui/OccupancyTracker.cpp
new file mode 100644
index 0000000..9687aaf
--- /dev/null
+++ b/libs/gui/OccupancyTracker.cpp
@@ -0,0 +1,117 @@
+/*
+ * Copyright 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#undef LOG_TAG
+#define LOG_TAG "OccupancyTracker"
+
+#include <gui/OccupancyTracker.h>
+#include <binder/Parcel.h>
+#include <utils/String8.h>
+#include <utils/Trace.h>
+
+#include <inttypes.h>
+
+namespace android {
+
+status_t OccupancyTracker::Segment::writeToParcel(Parcel* parcel) const {
+    status_t result = parcel->writeInt64(totalTime);
+    if (result != OK) {
+        return result;
+    }
+    result = parcel->writeUint64(static_cast<uint64_t>(numFrames));
+    if (result != OK) {
+        return result;
+    }
+    result = parcel->writeFloat(occupancyAverage);
+    if (result != OK) {
+        return result;
+    }
+    return parcel->writeBool(usedThirdBuffer);
+}
+
+status_t OccupancyTracker::Segment::readFromParcel(const Parcel* parcel) {
+    status_t result = parcel->readInt64(&totalTime);
+    if (result != OK) {
+        return result;
+    }
+    uint64_t uintNumFrames = 0;
+    result = parcel->readUint64(&uintNumFrames);
+    if (result != OK) {
+        return result;
+    }
+    numFrames = static_cast<size_t>(uintNumFrames);
+    result = parcel->readFloat(&occupancyAverage);
+    if (result != OK) {
+        return result;
+    }
+    return parcel->readBool(&usedThirdBuffer);
+}
+
+void OccupancyTracker::registerOccupancyChange(size_t occupancy) {
+    ATRACE_CALL();
+    nsecs_t now = systemTime();
+    nsecs_t delta = now - mLastOccupancyChangeTime;
+    if (delta > NEW_SEGMENT_DELAY) {
+        recordPendingSegment();
+    } else {
+        mPendingSegment.totalTime += delta;
+        if (mPendingSegment.mOccupancyTimes.count(mLastOccupancy)) {
+            mPendingSegment.mOccupancyTimes[mLastOccupancy] += delta;
+        } else {
+            mPendingSegment.mOccupancyTimes[mLastOccupancy] = delta;
+        }
+    }
+    if (occupancy > mLastOccupancy) {
+        ++mPendingSegment.numFrames;
+    }
+    mLastOccupancyChangeTime = now;
+    mLastOccupancy = occupancy;
+}
+
+std::vector<OccupancyTracker::Segment> OccupancyTracker::getSegmentHistory(
+        bool forceFlush) {
+    if (forceFlush) {
+        recordPendingSegment();
+    }
+    std::vector<Segment> segments(mSegmentHistory.cbegin(),
+            mSegmentHistory.cend());
+    mSegmentHistory.clear();
+    return segments;
+}
+
+void OccupancyTracker::recordPendingSegment() {
+    // Only record longer segments to get a better measurement of actual double-
+    // vs. triple-buffered time
+    if (mPendingSegment.numFrames > LONG_SEGMENT_THRESHOLD) {
+        float occupancyAverage = 0.0f;
+        bool usedThirdBuffer = false;
+        for (const auto& timePair : mPendingSegment.mOccupancyTimes) {
+            size_t occupancy = timePair.first;
+            float timeRatio = static_cast<float>(timePair.second) /
+                    mPendingSegment.totalTime;
+            occupancyAverage += timeRatio * occupancy;
+            usedThirdBuffer = usedThirdBuffer || (occupancy > 1);
+        }
+        mSegmentHistory.push_front({mPendingSegment.totalTime,
+                mPendingSegment.numFrames, occupancyAverage, usedThirdBuffer});
+        if (mSegmentHistory.size() > MAX_HISTORY_SIZE) {
+            mSegmentHistory.pop_back();
+        }
+    }
+    mPendingSegment.clear();
+}
+
+} // namespace android
diff --git a/libs/gui/Surface.cpp b/libs/gui/Surface.cpp
index 9d130cd..4739ca4 100644
--- a/libs/gui/Surface.cpp
+++ b/libs/gui/Surface.cpp
@@ -133,6 +133,39 @@
             outTransformMatrix);
 }
 
+bool Surface::getFrameTimestamps(uint64_t frameNumber, nsecs_t* outPostedTime,
+        nsecs_t* outAcquireTime, nsecs_t* outRefreshStartTime,
+        nsecs_t* outGlCompositionDoneTime, nsecs_t* outDisplayRetireTime,
+        nsecs_t* outReleaseTime) {
+    ATRACE_CALL();
+
+    FrameTimestamps timestamps;
+    bool found = mGraphicBufferProducer->getFrameTimestamps(frameNumber,
+            &timestamps);
+    if (found) {
+        if (outPostedTime) {
+            *outPostedTime = timestamps.postedTime;
+        }
+        if (outAcquireTime) {
+            *outAcquireTime = timestamps.acquireTime;
+        }
+        if (outRefreshStartTime) {
+            *outRefreshStartTime = timestamps.refreshStartTime;
+        }
+        if (outGlCompositionDoneTime) {
+            *outGlCompositionDoneTime = timestamps.glCompositionDoneTime;
+        }
+        if (outDisplayRetireTime) {
+            *outDisplayRetireTime = timestamps.displayRetireTime;
+        }
+        if (outReleaseTime) {
+            *outReleaseTime = timestamps.releaseTime;
+        }
+        return true;
+    }
+    return false;
+}
+
 int Surface::hook_setSwapInterval(ANativeWindow* window, int interval) {
     Surface* c = getSelf(window);
     return c->setSwapInterval(interval);
@@ -617,6 +650,9 @@
     case NATIVE_WINDOW_SET_AUTO_REFRESH:
         res = dispatchSetAutoRefresh(args);
         break;
+    case NATIVE_WINDOW_GET_FRAME_TIMESTAMPS:
+        res = dispatchGetFrameTimestamps(args);
+        break;
     default:
         res = NAME_NOT_FOUND;
         break;
@@ -737,6 +773,20 @@
     return setAutoRefresh(autoRefresh);
 }
 
+int Surface::dispatchGetFrameTimestamps(va_list args) {
+    uint32_t framesAgo = va_arg(args, uint32_t);
+    nsecs_t* outPostedTime = va_arg(args, int64_t*);
+    nsecs_t* outAcquireTime = va_arg(args, int64_t*);
+    nsecs_t* outRefreshStartTime = va_arg(args, int64_t*);
+    nsecs_t* outGlCompositionDoneTime = va_arg(args, int64_t*);
+    nsecs_t* outDisplayRetireTime = va_arg(args, int64_t*);
+    nsecs_t* outReleaseTime = va_arg(args, int64_t*);
+    bool ret = getFrameTimestamps(getNextFrameNumber() - 1 - framesAgo,
+            outPostedTime, outAcquireTime, outRefreshStartTime,
+            outGlCompositionDoneTime, outDisplayRetireTime, outReleaseTime);
+    return ret ? NO_ERROR : BAD_VALUE;
+}
+
 int Surface::connect(int api) {
     static sp<IProducerListener> listener = new DummyProducerListener();
     return connect(api, listener);
diff --git a/libs/gui/tests/BufferQueue_test.cpp b/libs/gui/tests/BufferQueue_test.cpp
index 85d63b4..210ce8c 100644
--- a/libs/gui/tests/BufferQueue_test.cpp
+++ b/libs/gui/tests/BufferQueue_test.cpp
@@ -34,6 +34,10 @@
 
 #include <gtest/gtest.h>
 
+#include <thread>
+
+using namespace std::chrono_literals;
+
 namespace android {
 
 class BufferQueueTest : public ::testing::Test {
@@ -850,4 +854,140 @@
             returnedBuffer->getNativeBuffer()->handle);
 }
 
+TEST_F(BufferQueueTest, TestOccupancyHistory) {
+    createBufferQueue();
+    sp<DummyConsumer> dc(new DummyConsumer);
+    ASSERT_EQ(OK, mConsumer->consumerConnect(dc, false));
+    IGraphicBufferProducer::QueueBufferOutput output;
+    ASSERT_EQ(OK, mProducer->connect(new DummyProducerListener,
+            NATIVE_WINDOW_API_CPU, false, &output));
+
+    int slot = BufferQueue::INVALID_BUFFER_SLOT;
+    sp<Fence> fence = Fence::NO_FENCE;
+    sp<GraphicBuffer> buffer = nullptr;
+    IGraphicBufferProducer::QueueBufferInput input(0ull, true,
+        HAL_DATASPACE_UNKNOWN, Rect::INVALID_RECT,
+        NATIVE_WINDOW_SCALING_MODE_FREEZE, 0, Fence::NO_FENCE);
+    BufferItem item{};
+
+    // Preallocate, dequeue, request, and cancel 3 buffers so we don't get
+    // BUFFER_NEEDS_REALLOCATION below
+    int slots[3] = {};
+    mProducer->setMaxDequeuedBufferCount(3);
+    for (size_t i = 0; i < 3; ++i) {
+        status_t result = mProducer->dequeueBuffer(&slots[i], &fence,
+                0, 0, 0, 0);
+        ASSERT_EQ(IGraphicBufferProducer::BUFFER_NEEDS_REALLOCATION, result);
+        ASSERT_EQ(OK, mProducer->requestBuffer(slots[i], &buffer));
+    }
+    for (size_t i = 0; i < 3; ++i) {
+        ASSERT_EQ(OK, mProducer->cancelBuffer(slots[i], Fence::NO_FENCE));
+    }
+
+    // Create 3 segments
+
+    // The first segment is a two-buffer segment, so we only put one buffer into
+    // the queue at a time
+    for (size_t i = 0; i < 5; ++i) {
+        ASSERT_EQ(OK, mProducer->dequeueBuffer(&slot, &fence, 0, 0, 0, 0));
+        ASSERT_EQ(OK, mProducer->queueBuffer(slot, input, &output));
+        ASSERT_EQ(OK, mConsumer->acquireBuffer(&item, 0));
+        ASSERT_EQ(OK, mConsumer->releaseBuffer(item.mSlot, item.mFrameNumber,
+                EGL_NO_DISPLAY, EGL_NO_SYNC_KHR, Fence::NO_FENCE));
+        std::this_thread::sleep_for(16ms);
+    }
+
+    // Sleep between segments
+    std::this_thread::sleep_for(500ms);
+
+    // The second segment is a double-buffer segment. It starts the same as the
+    // two-buffer segment, but then at the end, we put two buffers in the queue
+    // at the same time before draining it.
+    for (size_t i = 0; i < 5; ++i) {
+        ASSERT_EQ(OK, mProducer->dequeueBuffer(&slot, &fence, 0, 0, 0, 0));
+        ASSERT_EQ(OK, mProducer->queueBuffer(slot, input, &output));
+        ASSERT_EQ(OK, mConsumer->acquireBuffer(&item, 0));
+        ASSERT_EQ(OK, mConsumer->releaseBuffer(item.mSlot, item.mFrameNumber,
+                EGL_NO_DISPLAY, EGL_NO_SYNC_KHR, Fence::NO_FENCE));
+        std::this_thread::sleep_for(16ms);
+    }
+    ASSERT_EQ(OK, mProducer->dequeueBuffer(&slot, &fence, 0, 0, 0, 0));
+    ASSERT_EQ(OK, mProducer->queueBuffer(slot, input, &output));
+    ASSERT_EQ(OK, mProducer->dequeueBuffer(&slot, &fence, 0, 0, 0, 0));
+    ASSERT_EQ(OK, mProducer->queueBuffer(slot, input, &output));
+    ASSERT_EQ(OK, mConsumer->acquireBuffer(&item, 0));
+    ASSERT_EQ(OK, mConsumer->releaseBuffer(item.mSlot, item.mFrameNumber,
+            EGL_NO_DISPLAY, EGL_NO_SYNC_KHR, Fence::NO_FENCE));
+    std::this_thread::sleep_for(16ms);
+    ASSERT_EQ(OK, mConsumer->acquireBuffer(&item, 0));
+    ASSERT_EQ(OK, mConsumer->releaseBuffer(item.mSlot, item.mFrameNumber,
+            EGL_NO_DISPLAY, EGL_NO_SYNC_KHR, Fence::NO_FENCE));
+
+    // Sleep between segments
+    std::this_thread::sleep_for(500ms);
+
+    // The third segment is a triple-buffer segment, so the queue is switching
+    // between one buffer and two buffers deep.
+    ASSERT_EQ(OK, mProducer->dequeueBuffer(&slot, &fence, 0, 0, 0, 0));
+    ASSERT_EQ(OK, mProducer->queueBuffer(slot, input, &output));
+    for (size_t i = 0; i < 5; ++i) {
+        ASSERT_EQ(OK, mProducer->dequeueBuffer(&slot, &fence, 0, 0, 0, 0));
+        ASSERT_EQ(OK, mProducer->queueBuffer(slot, input, &output));
+        ASSERT_EQ(OK, mConsumer->acquireBuffer(&item, 0));
+        ASSERT_EQ(OK, mConsumer->releaseBuffer(item.mSlot, item.mFrameNumber,
+                    EGL_NO_DISPLAY, EGL_NO_SYNC_KHR, Fence::NO_FENCE));
+        std::this_thread::sleep_for(16ms);
+    }
+    ASSERT_EQ(OK, mConsumer->acquireBuffer(&item, 0));
+    ASSERT_EQ(OK, mConsumer->releaseBuffer(item.mSlot, item.mFrameNumber,
+            EGL_NO_DISPLAY, EGL_NO_SYNC_KHR, Fence::NO_FENCE));
+
+    // Now we read the segments
+    std::vector<OccupancyTracker::Segment> history;
+    ASSERT_EQ(OK, mConsumer->getOccupancyHistory(false, &history));
+
+    // Since we didn't force a flush, we should only get the first two segments
+    // (since the third segment hasn't been closed out by the appearance of a
+    // new segment yet)
+    ASSERT_EQ(2u, history.size());
+
+    // The first segment (which will be history[1], since the newest segment
+    // should be at the front of the vector) should be a two-buffer segment,
+    // which implies that the occupancy average should be between 0 and 1, and
+    // usedThirdBuffer should be false
+    const auto& firstSegment = history[1];
+    ASSERT_EQ(5u, firstSegment.numFrames);
+    ASSERT_LT(0, firstSegment.occupancyAverage);
+    ASSERT_GT(1, firstSegment.occupancyAverage);
+    ASSERT_EQ(false, firstSegment.usedThirdBuffer);
+
+    // The second segment should be a double-buffered segment, which implies that
+    // the occupancy average should be between 0 and 1, but usedThirdBuffer
+    // should be true
+    const auto& secondSegment = history[0];
+    ASSERT_EQ(7u, secondSegment.numFrames);
+    ASSERT_LT(0, secondSegment.occupancyAverage);
+    ASSERT_GT(1, secondSegment.occupancyAverage);
+    ASSERT_EQ(true, secondSegment.usedThirdBuffer);
+
+    // If we read the segments again without flushing, we shouldn't get any new
+    // segments
+    ASSERT_EQ(OK, mConsumer->getOccupancyHistory(false, &history));
+    ASSERT_EQ(0u, history.size());
+
+    // Read the segments again, this time forcing a flush so we get the third
+    // segment
+    ASSERT_EQ(OK, mConsumer->getOccupancyHistory(true, &history));
+    ASSERT_EQ(1u, history.size());
+
+    // This segment should be a triple-buffered segment, which implies that the
+    // occupancy average should be between 1 and 2, and usedThirdBuffer should
+    // be true
+    const auto& thirdSegment = history[0];
+    ASSERT_EQ(6u, thirdSegment.numFrames);
+    ASSERT_LT(1, thirdSegment.occupancyAverage);
+    ASSERT_GT(2, thirdSegment.occupancyAverage);
+    ASSERT_EQ(true, thirdSegment.usedThirdBuffer);
+}
+
 } // namespace android
diff --git a/opengl/libagl/context.h b/opengl/libagl/context.h
index d23f435..18ef7d5 100644
--- a/opengl/libagl/context.h
+++ b/opengl/libagl/context.h
@@ -26,7 +26,8 @@
 #endif
 
 #include <private/pixelflinger/ggl_context.h>
-#include <hardware/gralloc.h>
+
+#include <system/window.h>
 
 #include <GLES/gl.h>
 #include <GLES/glext.h>
@@ -615,7 +616,7 @@
     culling_t               cull;
     lighting_t              lighting;
     user_clip_planes_t      clipPlanes;
-    compute_iterators_t     lerp;           __attribute__((aligned(32)));
+    compute_iterators_t     lerp           __attribute__((aligned(32)));
     vertex_t                current;
     vec4_t                  currentColorClamped;
     vec3_t                  currentNormal;
diff --git a/opengl/libagl/egl.cpp b/opengl/libagl/egl.cpp
index 92139e9..c1efd1c 100644
--- a/opengl/libagl/egl.cpp
+++ b/opengl/libagl/egl.cpp
@@ -32,6 +32,7 @@
 #include <utils/threads.h>
 #include <ui/ANativeObjectBase.h>
 #include <ui/Fence.h>
+#include <ui/GraphicBufferMapper.h>
 
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
@@ -242,7 +243,6 @@
     ANativeWindow*   nativeWindow;
     ANativeWindowBuffer*   buffer;
     ANativeWindowBuffer*   previousBuffer;
-    gralloc_module_t const*    module;
     int width;
     int height;
     void* bits;
@@ -341,16 +341,12 @@
         EGLConfig config,
         int32_t depthFormat,
         ANativeWindow* window)
-    : egl_surface_t(dpy, config, depthFormat), 
-    nativeWindow(window), buffer(0), previousBuffer(0), module(0),
-    bits(NULL)
+    : egl_surface_t(dpy, config, depthFormat),
+    nativeWindow(window), buffer(0), previousBuffer(0), bits(NULL)
 {
-    hw_module_t const* pModule;
-    hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &pModule);
-    module = reinterpret_cast<gralloc_module_t const*>(pModule);
 
     pixelFormatTable = gglGetPixelFormatTable();
-    
+
     // keep a reference on the window
     nativeWindow->common.incRef(&nativeWindow->common);
     nativeWindow->query(nativeWindow, NATIVE_WINDOW_WIDTH, &width);
@@ -440,22 +436,16 @@
 status_t egl_window_surface_v2_t::lock(
         ANativeWindowBuffer* buf, int usage, void** vaddr)
 {
-    int err;
-
-    err = module->lock(module, buf->handle,
-            usage, 0, 0, buf->width, buf->height, vaddr);
-
-    return err;
+    auto& mapper = GraphicBufferMapper::get();
+    return mapper.lock(buf->handle, usage,
+            android::Rect(buf->width, buf->height), vaddr);
 }
 
 status_t egl_window_surface_v2_t::unlock(ANativeWindowBuffer* buf)
 {
     if (!buf) return BAD_VALUE;
-    int err = NO_ERROR;
-
-    err = module->unlock(module, buf->handle);
-
-    return err;
+    auto& mapper = GraphicBufferMapper::get();
+    return mapper.unlock(buf->handle);
 }
 
 void egl_window_surface_v2_t::copyBlt(
diff --git a/opengl/libagl/light.cpp b/opengl/libagl/light.cpp
index 479bf7e..e7fe9d7 100644
--- a/opengl/libagl/light.cpp
+++ b/opengl/libagl/light.cpp
@@ -229,7 +229,7 @@
 #endif
         vnorm3(l.normalizedObjPosition.v, l.objPosition.v);
     }
-    const vec4_t eyeViewer = { 0, 0, 0x10000, 0 };
+    const vec4_t eyeViewer = {{{ 0, 0, 0x10000, 0 }}};
 #if OBJECT_SPACE_LIGHTING
     c->transforms.mvui.point3(&c->transforms.mvui,
             &c->lighting.objViewer, &eyeViewer);
diff --git a/opengl/libagl/matrix.cpp b/opengl/libagl/matrix.cpp
index cdeccb3..034c857 100644
--- a/opengl/libagl/matrix.cpp
+++ b/opengl/libagl/matrix.cpp
@@ -253,13 +253,13 @@
 {
     GLfloat const* const m = lhs.m;
     for (int i=0 ; i<4 ; i++) {
-        register const float rhs_i0 = rhs.m[ I(i,0) ];
-        register float ri0 = m[ I(0,0) ] * rhs_i0;
-        register float ri1 = m[ I(0,1) ] * rhs_i0;
-        register float ri2 = m[ I(0,2) ] * rhs_i0;
-        register float ri3 = m[ I(0,3) ] * rhs_i0;
+        const float rhs_i0 = rhs.m[ I(i,0) ];
+        float ri0 = m[ I(0,0) ] * rhs_i0;
+        float ri1 = m[ I(0,1) ] * rhs_i0;
+        float ri2 = m[ I(0,2) ] * rhs_i0;
+        float ri3 = m[ I(0,3) ] * rhs_i0;
         for (int j=1 ; j<4 ; j++) {
-            register const float rhs_ij = rhs.m[ I(i,j) ];
+            const float rhs_ij = rhs.m[ I(i,j) ];
             ri0 += m[ I(j,0) ] * rhs_ij;
             ri1 += m[ I(j,1) ] * rhs_ij;
             ri2 += m[ I(j,2) ] * rhs_ij;
diff --git a/opengl/libagl/texture.cpp b/opengl/libagl/texture.cpp
index 9aa1c4f..3fe5ed0 100644
--- a/opengl/libagl/texture.cpp
+++ b/opengl/libagl/texture.cpp
@@ -25,6 +25,9 @@
 
 #include <ETC1/etc1.h>
 
+#include <ui/GraphicBufferMapper.h>
+#include <ui/Rect.h>
+
 namespace android {
 
 // ----------------------------------------------------------------------------
@@ -128,17 +131,11 @@
             ANativeWindowBuffer* native_buffer = u.texture->buffer;
             if (native_buffer) {
                 c->rasterizer.procs.activeTexture(c, i);
-                hw_module_t const* pModule;
-                if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &pModule))
-                    continue;
 
-                gralloc_module_t const* module =
-                    reinterpret_cast<gralloc_module_t const*>(pModule);
-
+                auto& mapper = GraphicBufferMapper::get();
                 void* vaddr;
-                int err = module->lock(module, native_buffer->handle,
-                        GRALLOC_USAGE_SW_READ_OFTEN,
-                        0, 0, native_buffer->width, native_buffer->height,
+                mapper.lock(native_buffer->handle, GRALLOC_USAGE_SW_READ_OFTEN,
+                        Rect(native_buffer->width, native_buffer->height),
                         &vaddr);
 
                 u.texture->setImageBits(vaddr);
@@ -156,14 +153,10 @@
             ANativeWindowBuffer* native_buffer = u.texture->buffer;
             if (native_buffer) {
                 c->rasterizer.procs.activeTexture(c, i);
-                hw_module_t const* pModule;
-                if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &pModule))
-                    continue;
 
-                gralloc_module_t const* module =
-                    reinterpret_cast<gralloc_module_t const*>(pModule);
+                auto& mapper = GraphicBufferMapper::get();
+                mapper.unlock(native_buffer->handle);
 
-                module->unlock(module, native_buffer->handle);
                 u.texture->setImageBits(NULL);
                 c->rasterizer.procs.bindTexture(c, &(u.texture->surface));
             }
@@ -405,7 +398,7 @@
     return 0;
 }
 
-static size_t dataSizePalette4(int numLevels, int width, int height, int format)
+static GLsizei dataSizePalette4(int numLevels, int width, int height, int format)
 {
     int indexBits = 8;
     int entrySize = 0;
diff --git a/services/inputflinger/InputReader.cpp b/services/inputflinger/InputReader.cpp
index 374a5de..a2d689b 100644
--- a/services/inputflinger/InputReader.cpp
+++ b/services/inputflinger/InputReader.cpp
@@ -134,6 +134,10 @@
         { AKEYCODE_DPAD_RIGHT,  AKEYCODE_DPAD_UP,     AKEYCODE_DPAD_LEFT,   AKEYCODE_DPAD_DOWN },
         { AKEYCODE_DPAD_UP,     AKEYCODE_DPAD_LEFT,   AKEYCODE_DPAD_DOWN,   AKEYCODE_DPAD_RIGHT },
         { AKEYCODE_DPAD_LEFT,   AKEYCODE_DPAD_DOWN,   AKEYCODE_DPAD_RIGHT,  AKEYCODE_DPAD_UP },
+        { AKEYCODE_FP_NAV_DOWN,   AKEYCODE_FP_NAV_RIGHT,  AKEYCODE_FP_NAV_UP,     AKEYCODE_FP_NAV_LEFT },
+        { AKEYCODE_FP_NAV_RIGHT,  AKEYCODE_FP_NAV_UP,     AKEYCODE_FP_NAV_LEFT,   AKEYCODE_FP_NAV_DOWN },
+        { AKEYCODE_FP_NAV_UP,     AKEYCODE_FP_NAV_LEFT,   AKEYCODE_FP_NAV_DOWN,   AKEYCODE_FP_NAV_RIGHT },
+        { AKEYCODE_FP_NAV_LEFT,   AKEYCODE_FP_NAV_DOWN,   AKEYCODE_FP_NAV_RIGHT,  AKEYCODE_FP_NAV_UP },
 };
 static const size_t keyCodeRotationMapSize =
         sizeof(keyCodeRotationMap) / sizeof(keyCodeRotationMap[0]);
diff --git a/services/surfaceflinger/Android.mk b/services/surfaceflinger/Android.mk
index fb6307e..d654b17 100644
--- a/services/surfaceflinger/Android.mk
+++ b/services/surfaceflinger/Android.mk
@@ -44,7 +44,6 @@
 
 LOCAL_CFLAGS := -DLOG_TAG=\"SurfaceFlinger\"
 LOCAL_CFLAGS += -DGL_GLEXT_PROTOTYPES -DEGL_EGLEXT_PROTOTYPES
-#LOCAL_CFLAGS += -DENABLE_FENCE_TRACKING
 
 USE_HWC2 := false
 ifeq ($(USE_HWC2),true)
diff --git a/services/surfaceflinger/FenceTracker.cpp b/services/surfaceflinger/FenceTracker.cpp
index 885d712..3ff9bbf 100644
--- a/services/surfaceflinger/FenceTracker.cpp
+++ b/services/surfaceflinger/FenceTracker.cpp
@@ -26,7 +26,9 @@
 FenceTracker::FenceTracker() :
         mFrameCounter(0),
         mOffset(0),
-        mFrames() {}
+        mFrames(),
+        mMutex() {
+}
 
 void FenceTracker::dump(String8* outString) {
     Mutex::Autolock lock(mMutex);
@@ -135,7 +137,7 @@
         nsecs_t postedTime;
         sp<Fence> acquireFence;
         sp<Fence> prevReleaseFence;
-        int32_t key = layers[i]->getSequence();
+        int32_t layerId = layers[i]->getSequence();
 
         layers[i]->getFenceData(&name, &frameNumber, &glesComposition,
                 &postedTime, &acquireFence, &prevReleaseFence);
@@ -144,13 +146,17 @@
             frame.layers.emplace(std::piecewise_construct,
                     std::forward_as_tuple(key),
                     std::forward_as_tuple(name, frameNumber, glesComposition,
-                    postedTime, 0, 0, acquireFence, prevReleaseFence));
+                    postedTime, FrameTimestamps::INVALID_TIME,
+                    FrameTimestamps::INVALID_TIME, acquireFence,
+                    prevReleaseFence));
             wasGlesCompositionDone = true;
         } else {
             frame.layers.emplace(std::piecewise_construct,
                     std::forward_as_tuple(key),
                     std::forward_as_tuple(name, frameNumber, glesComposition,
-                    postedTime, 0, 0, acquireFence, Fence::NO_FENCE));
+                    postedTime, FrameTimestamps::INVALID_TIME,
+                    FrameTimestamps::INVALID_TIME, acquireFence,
+                    Fence::NO_FENCE));
 
             auto prevLayer = prevFrame.layers.find(key);
             if (prevLayer != prevFrame.layers.end()) {
@@ -159,7 +165,7 @@
         }
 #else
         frame.layers.emplace(std::piecewise_construct,
-                std::forward_as_tuple(key),
+                std::forward_as_tuple(layerId),
                 std::forward_as_tuple(name, frameNumber, glesComposition,
                 postedTime, 0, 0, acquireFence,
                 glesComposition ? Fence::NO_FENCE : prevReleaseFence));
@@ -168,7 +174,7 @@
         }
 #endif
         frame.layers.emplace(std::piecewise_construct,
-                std::forward_as_tuple(key),
+                std::forward_as_tuple(layerId),
                 std::forward_as_tuple(name, frameNumber, glesComposition,
                 postedTime, 0, 0, acquireFence, prevReleaseFence));
     }
@@ -184,8 +190,35 @@
 
     mOffset = (mOffset + 1) % MAX_FRAME_HISTORY;
     mFrameCounter++;
+}
 
+bool FenceTracker::getFrameTimestamps(const Layer& layer,
+        uint64_t frameNumber, FrameTimestamps* outTimestamps) {
+    Mutex::Autolock lock(mMutex);
     checkFencesForCompletion();
+    int32_t layerId = layer.getSequence();
+
+    size_t i = 0;
+    for (; i < MAX_FRAME_HISTORY; i++) {
+       if (mFrames[i].layers.count(layerId) &&
+               mFrames[i].layers[layerId].frameNumber == frameNumber) {
+           break;
+       }
+    }
+    if (i == MAX_FRAME_HISTORY) {
+        return false;
+    }
+
+    const FrameRecord& frameRecord = mFrames[i];
+    const LayerRecord& layerRecord = mFrames[i].layers[layerId];
+    outTimestamps->frameNumber = frameNumber;
+    outTimestamps->postedTime = layerRecord.postedTime;
+    outTimestamps->acquireTime = layerRecord.acquireTime;
+    outTimestamps->refreshStartTime = frameRecord.refreshStartTime;
+    outTimestamps->glCompositionDoneTime = frameRecord.glesCompositionDoneTime;
+    outTimestamps->displayRetireTime = frameRecord.retireTime;
+    outTimestamps->releaseTime = layerRecord.releaseTime;
+    return true;
 }
 
 } // namespace android
diff --git a/services/surfaceflinger/FenceTracker.h b/services/surfaceflinger/FenceTracker.h
index de99820..4cb14a5 100644
--- a/services/surfaceflinger/FenceTracker.h
+++ b/services/surfaceflinger/FenceTracker.h
@@ -29,7 +29,7 @@
 namespace android {
 
 class Layer;
-
+struct FrameTimestamps;
 /*
  * Keeps a circular buffer of fence/timestamp data for the last N frames in
  * SurfaceFlinger. Gets timestamps for fences after they have signaled.
@@ -40,9 +40,11 @@
      void dump(String8* outString);
      void addFrame(nsecs_t refreshStartTime, sp<Fence> retireFence,
              const Vector<sp<Layer>>& layers, sp<Fence> glDoneFence);
+     bool getFrameTimestamps(const Layer& layer, uint64_t frameNumber,
+             FrameTimestamps* outTimestamps);
 
 protected:
-     static constexpr size_t MAX_FRAME_HISTORY = 128;
+     static constexpr size_t MAX_FRAME_HISTORY = 8;
 
      struct LayerRecord {
          String8 name; // layer name
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index 0247723..d732c07 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -155,7 +155,8 @@
     sp<IGraphicBufferConsumer> consumer;
     BufferQueue::createBufferQueue(&producer, &consumer);
     mProducer = new MonitoredProducer(producer, mFlinger);
-    mSurfaceFlingerConsumer = new SurfaceFlingerConsumer(consumer, mTextureName);
+    mSurfaceFlingerConsumer = new SurfaceFlingerConsumer(consumer, mTextureName,
+            this);
     mSurfaceFlingerConsumer->setConsumerUsageBits(getEffectiveUsage(0));
     mSurfaceFlingerConsumer->setContentsChangedListener(this);
     mSurfaceFlingerConsumer->setName(mName);
@@ -1674,7 +1675,8 @@
     return mQueuedFrames > 0 || mSidebandStreamChanged || mAutoRefresh;
 }
 
-void Layer::onPostComposition() {
+bool Layer::onPostComposition() {
+    bool frameLatencyNeeded = mFrameLatencyNeeded;
     if (mFrameLatencyNeeded) {
         nsecs_t desiredPresentTime = mSurfaceFlingerConsumer->getTimestamp();
         mFrameTracker.setDesiredPresentTime(desiredPresentTime);
@@ -1706,6 +1708,7 @@
         mFrameTracker.advanceFrame();
         mFrameLatencyNeeded = false;
     }
+    return frameLatencyNeeded;
 }
 
 #ifdef USE_HWC2
@@ -2180,6 +2183,20 @@
     *outAcquireFence = mSurfaceFlingerConsumer->getCurrentFence();
     *outPrevReleaseFence = mSurfaceFlingerConsumer->getPrevReleaseFence();
 }
+
+std::vector<OccupancyTracker::Segment> Layer::getOccupancyHistory(
+        bool forceFlush) {
+    std::vector<OccupancyTracker::Segment> history;
+    status_t result = mSurfaceFlingerConsumer->getOccupancyHistory(forceFlush,
+            &history);
+    if (result != NO_ERROR) {
+        ALOGW("[%s] Failed to obtain occupancy history (%d)", mName.string(),
+                result);
+        return {};
+    }
+    return history;
+}
+
 // ---------------------------------------------------------------------------
 
 Layer::LayerCleaner::LayerCleaner(const sp<SurfaceFlinger>& flinger,
diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index ba7184f..4257c37 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -274,9 +274,10 @@
     bool onPreComposition();
 
     /*
-     *  called after composition.
+     * called after composition.
+     * returns true if the layer latched a new buffer this frame.
      */
-    void onPostComposition();
+    bool onPostComposition();
 
 #ifdef USE_HWC2
     // If a buffer was replaced this frame, release the former buffer
@@ -406,6 +407,13 @@
             bool* outIsGlesComposition, nsecs_t* outPostedTime,
             sp<Fence>* outAcquireFence, sp<Fence>* outPrevReleaseFence) const;
 
+    std::vector<OccupancyTracker::Segment> getOccupancyHistory(bool forceFlush);
+
+    bool getFrameTimestamps(uint64_t frameNumber,
+            FrameTimestamps* outTimestamps) const {
+        return mFlinger->getFrameTimestamps(*this, frameNumber, outTimestamps);
+    }
+
 protected:
     // constant
     sp<SurfaceFlinger> mFlinger;
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index a10a813..9f357df 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -939,11 +939,7 @@
 void SurfaceFlinger::handleMessageRefresh() {
     ATRACE_CALL();
 
-#ifdef ENABLE_FENCE_TRACKING
     nsecs_t refreshStartTime = systemTime(SYSTEM_TIME_MONOTONIC);
-#else
-    nsecs_t refreshStartTime = 0;
-#endif
     static nsecs_t previousExpectedPresent = 0;
     nsecs_t expectedPresent = mPrimaryDispSync.computeNextRefresh(0);
     static bool previousFrameMissed = false;
@@ -1033,11 +1029,7 @@
     }
 }
 
-#ifdef ENABLE_FENCE_TRACKING
 void SurfaceFlinger::postComposition(nsecs_t refreshStartTime)
-#else
-void SurfaceFlinger::postComposition(nsecs_t /*refreshStartTime*/)
-#endif
 {
     ATRACE_CALL();
     ALOGV("postComposition");
@@ -1045,7 +1037,11 @@
     const LayerVector& layers(mDrawingState.layersSortedByZ);
     const size_t count = layers.size();
     for (size_t i=0 ; i<count ; i++) {
-        layers[i]->onPostComposition();
+        bool frameLatched = layers[i]->onPostComposition();
+        if (frameLatched) {
+            recordBufferingStats(layers[i]->getName().string(),
+                    layers[i]->getOccupancyHistory(false));
+        }
     }
 
     sp<Fence> presentFence = mHwc->getRetireFence(HWC_DISPLAY_PRIMARY);
@@ -1065,10 +1061,8 @@
         }
     }
 
-#ifdef ENABLE_FENCE_TRACKING
     mFenceTracker.addFrame(refreshStartTime, presentFence,
             hw->getVisibleLayersSortedByZ(), hw->getClientTargetAcquireFence());
-#endif
 
     if (mAnimCompositionPending) {
         mAnimCompositionPending = false;
@@ -1646,6 +1640,8 @@
     if (!mLayersPendingRemoval.isEmpty()) {
         // Notify removed layers now that they can't be drawn from
         for (size_t i = 0; i < mLayersPendingRemoval.size(); i++) {
+            recordBufferingStats(mLayersPendingRemoval[i]->getName().string(),
+                    mLayersPendingRemoval[i]->getOccupancyHistory(true));
             mLayersPendingRemoval[i]->onRemoved();
         }
         mLayersPendingRemoval.clear();
@@ -2607,14 +2603,12 @@
                 dumpAll = false;
             }
 
-#ifdef ENABLE_FENCE_TRACKING
             if ((index < numArgs) &&
                     (args[index] == String16("--fences"))) {
                 index++;
                 mFenceTracker.dump(&result);
                 dumpAll = false;
             }
-#endif
         }
 
         if (dumpAll) {
@@ -2735,6 +2729,59 @@
             NUM_BUCKETS - 1, bucketTimeSec, percent);
 }
 
+void SurfaceFlinger::recordBufferingStats(const char* layerName,
+        std::vector<OccupancyTracker::Segment>&& history) {
+    Mutex::Autolock lock(mBufferingStatsMutex);
+    auto& stats = mBufferingStats[layerName];
+    for (const auto& segment : history) {
+        if (!segment.usedThirdBuffer) {
+            stats.twoBufferTime += segment.totalTime;
+        }
+        if (segment.occupancyAverage < 1.0f) {
+            stats.doubleBufferedTime += segment.totalTime;
+        } else if (segment.occupancyAverage < 2.0f) {
+            stats.tripleBufferedTime += segment.totalTime;
+        }
+        ++stats.numSegments;
+        stats.totalTime += segment.totalTime;
+    }
+}
+
+void SurfaceFlinger::dumpBufferingStats(String8& result) const {
+    result.append("Buffering stats:\n");
+    result.append("  [Layer name] <Active time> <Two buffer> "
+            "<Double buffered> <Triple buffered>\n");
+    Mutex::Autolock lock(mBufferingStatsMutex);
+    typedef std::tuple<std::string, float, float, float> BufferTuple;
+    std::map<float, BufferTuple, std::greater<float>> sorted;
+    for (const auto& statsPair : mBufferingStats) {
+        const char* name = statsPair.first.c_str();
+        const BufferingStats& stats = statsPair.second;
+        if (stats.numSegments == 0) {
+            continue;
+        }
+        float activeTime = ns2ms(stats.totalTime) / 1000.0f;
+        float twoBufferRatio = static_cast<float>(stats.twoBufferTime) /
+                stats.totalTime;
+        float doubleBufferRatio = static_cast<float>(
+                stats.doubleBufferedTime) / stats.totalTime;
+        float tripleBufferRatio = static_cast<float>(
+                stats.tripleBufferedTime) / stats.totalTime;
+        sorted.insert({activeTime, {name, twoBufferRatio,
+                doubleBufferRatio, tripleBufferRatio}});
+    }
+    for (const auto& sortedPair : sorted) {
+        float activeTime = sortedPair.first;
+        const BufferTuple& values = sortedPair.second;
+        result.appendFormat("  [%s] %.2f %.3f %.3f %.3f\n",
+                std::get<0>(values).c_str(), activeTime,
+                std::get<1>(values), std::get<2>(values),
+                std::get<3>(values));
+    }
+    result.append("\n");
+}
+
+
 void SurfaceFlinger::dumpAllLocked(const Vector<String16>& args, size_t& index,
         String8& result) const
 {
@@ -2788,6 +2835,8 @@
     dumpStaticScreenStats(result);
     result.append("\n");
 
+    dumpBufferingStats(result);
+
     /*
      * Dump the visible layer list
      */
@@ -3560,6 +3609,11 @@
     }
 }
 
+bool SurfaceFlinger::getFrameTimestamps(const Layer& layer,
+        uint64_t frameNumber, FrameTimestamps* outTimestamps) {
+    return mFenceTracker.getFrameTimestamps(layer, frameNumber, outTimestamps);
+}
+
 // ---------------------------------------------------------------------------
 
 SurfaceFlinger::LayerVector::LayerVector() {
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 633e956..28666e2 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -42,6 +42,7 @@
 
 #include <gui/ISurfaceComposer.h>
 #include <gui/ISurfaceComposerClient.h>
+#include <gui/OccupancyTracker.h>
 
 #include <hardware/hwcomposer_defs.h>
 
@@ -57,6 +58,9 @@
 #include "DisplayHardware/HWComposer.h"
 #include "Effects/Daltonizer.h"
 
+#include <map>
+#include <string>
+
 namespace android {
 
 // ---------------------------------------------------------------------------
@@ -432,6 +436,13 @@
 
     void dumpStaticScreenStats(String8& result) const;
 
+    void recordBufferingStats(const char* layerName,
+            std::vector<OccupancyTracker::Segment>&& history);
+    void dumpBufferingStats(String8& result) const;
+
+    bool getFrameTimestamps(const Layer& layer, uint64_t frameNumber,
+            FrameTimestamps* outTimestamps);
+
     /* ------------------------------------------------------------------------
      * Attributes
      */
@@ -526,6 +537,29 @@
     nsecs_t mFrameBuckets[NUM_BUCKETS];
     nsecs_t mTotalTime;
     std::atomic<nsecs_t> mLastSwapTime;
+
+    // Double- vs. triple-buffering stats
+    struct BufferingStats {
+        BufferingStats()
+          : numSegments(0),
+            totalTime(0),
+            twoBufferTime(0),
+            doubleBufferedTime(0),
+            tripleBufferedTime(0) {}
+
+        size_t numSegments;
+        nsecs_t totalTime;
+
+        // "Two buffer" means that a third buffer was never used, whereas
+        // "double-buffered" means that on average the segment only used two
+        // buffers (though it may have used a third for some part of the
+        // segment)
+        nsecs_t twoBufferTime;
+        nsecs_t doubleBufferedTime;
+        nsecs_t tripleBufferedTime;
+    };
+    mutable Mutex mBufferingStatsMutex;
+    std::unordered_map<std::string, BufferingStats> mBufferingStats;
 };
 
 }; // namespace android
diff --git a/services/surfaceflinger/SurfaceFlingerConsumer.cpp b/services/surfaceflinger/SurfaceFlingerConsumer.cpp
index c71b3bc..ba0a527 100644
--- a/services/surfaceflinger/SurfaceFlingerConsumer.cpp
+++ b/services/surfaceflinger/SurfaceFlingerConsumer.cpp
@@ -18,6 +18,7 @@
 //#define LOG_NDEBUG 0
 
 #include "SurfaceFlingerConsumer.h"
+#include "Layer.h"
 
 #include <private/gui/SyncFeatures.h>
 
@@ -251,6 +252,12 @@
     }
 }
 
+bool SurfaceFlingerConsumer::getFrameTimestamps(uint64_t frameNumber,
+        FrameTimestamps* outTimestamps) const {
+    sp<const Layer> l = mLayer.promote();
+    return l.get() ? l->getFrameTimestamps(frameNumber, outTimestamps) : false;
+}
+
 // ---------------------------------------------------------------------------
 }; // namespace android
 
diff --git a/services/surfaceflinger/SurfaceFlingerConsumer.h b/services/surfaceflinger/SurfaceFlingerConsumer.h
index 51b002f..3762659 100644
--- a/services/surfaceflinger/SurfaceFlingerConsumer.h
+++ b/services/surfaceflinger/SurfaceFlingerConsumer.h
@@ -23,6 +23,8 @@
 namespace android {
 // ----------------------------------------------------------------------------
 
+class Layer;
+
 /*
  * This is a thin wrapper around GLConsumer.
  */
@@ -35,10 +37,10 @@
     };
 
     SurfaceFlingerConsumer(const sp<IGraphicBufferConsumer>& consumer,
-            uint32_t tex)
+            uint32_t tex, const Layer* layer)
         : GLConsumer(consumer, tex, GLConsumer::TEXTURE_EXTERNAL, false, false),
           mTransformToDisplayInverse(false), mSurfaceDamage(),
-          mPrevReleaseFence(Fence::NO_FENCE)
+          mPrevReleaseFence(Fence::NO_FENCE), mLayer(layer)
     {}
 
     class BufferRejecter {
@@ -82,6 +84,9 @@
     void releasePendingBuffer();
 #endif
 
+    virtual bool getFrameTimestamps(uint64_t frameNumber,
+            FrameTimestamps* outTimestamps) const override;
+
 private:
     virtual void onSidebandStreamChanged();
 
@@ -103,6 +108,9 @@
 
     // The release fence of the already displayed buffer (previous frame).
     sp<Fence> mPrevReleaseFence;
+
+    // The layer for this SurfaceFlingerConsumer
+    wp<const Layer> mLayer;
 };
 
 // ----------------------------------------------------------------------------
diff --git a/services/surfaceflinger/SurfaceFlinger_hwc1.cpp b/services/surfaceflinger/SurfaceFlinger_hwc1.cpp
index 7f3b269..a86c692 100644
--- a/services/surfaceflinger/SurfaceFlinger_hwc1.cpp
+++ b/services/surfaceflinger/SurfaceFlinger_hwc1.cpp
@@ -943,11 +943,7 @@
 void SurfaceFlinger::handleMessageRefresh() {
     ATRACE_CALL();
 
-#ifdef ENABLE_FENCE_TRACKING
     nsecs_t refreshStartTime = systemTime(SYSTEM_TIME_MONOTONIC);
-#else
-    nsecs_t refreshStartTime = 0;
-#endif
     static nsecs_t previousExpectedPresent = 0;
     nsecs_t expectedPresent = mPrimaryDispSync.computeNextRefresh(0);
     static bool previousFrameMissed = false;
@@ -1029,16 +1025,16 @@
     }
 }
 
-#ifdef ENABLE_FENCE_TRACKING
 void SurfaceFlinger::postComposition(nsecs_t refreshStartTime)
-#else
-void SurfaceFlinger::postComposition(nsecs_t /*refreshStartTime*/)
-#endif
 {
     const LayerVector& layers(mDrawingState.layersSortedByZ);
     const size_t count = layers.size();
     for (size_t i=0 ; i<count ; i++) {
-        layers[i]->onPostComposition();
+        bool frameLatched = layers[i]->onPostComposition();
+        if (frameLatched) {
+            recordBufferingStats(layers[i]->getName().string(),
+                    layers[i]->getOccupancyHistory(false));
+        }
     }
 
     const HWComposer& hwc = getHwComposer();
@@ -1059,10 +1055,8 @@
         }
     }
 
-#ifdef ENABLE_FENCE_TRACKING
     mFenceTracker.addFrame(refreshStartTime, presentFence,
             hw->getVisibleLayersSortedByZ(), hw->getClientTargetAcquireFence());
-#endif
 
     if (mAnimCompositionPending) {
         mAnimCompositionPending = false;
@@ -1666,6 +1660,8 @@
     if (!mLayersPendingRemoval.isEmpty()) {
         // Notify removed layers now that they can't be drawn from
         for (size_t i = 0; i < mLayersPendingRemoval.size(); i++) {
+            recordBufferingStats(mLayersPendingRemoval[i]->getName().string(),
+                    mLayersPendingRemoval[i]->getOccupancyHistory(true));
             mLayersPendingRemoval[i]->onRemoved();
         }
         mLayersPendingRemoval.clear();
@@ -2623,14 +2619,12 @@
                 dumpAll = false;
             }
 
-#ifdef ENABLE_FENCE_TRACKING
             if ((index < numArgs) &&
                     (args[index] == String16("--fences"))) {
                 index++;
                 mFenceTracker.dump(&result);
                 dumpAll = false;
             }
-#endif
         }
 
         if (dumpAll) {
@@ -2751,6 +2745,58 @@
             NUM_BUCKETS - 1, bucketTimeSec, percent);
 }
 
+void SurfaceFlinger::recordBufferingStats(const char* layerName,
+        std::vector<OccupancyTracker::Segment>&& history) {
+    Mutex::Autolock lock(mBufferingStatsMutex);
+    auto& stats = mBufferingStats[layerName];
+    for (const auto& segment : history) {
+        if (!segment.usedThirdBuffer) {
+            stats.twoBufferTime += segment.totalTime;
+        }
+        if (segment.occupancyAverage < 1.0f) {
+            stats.doubleBufferedTime += segment.totalTime;
+        } else if (segment.occupancyAverage < 2.0f) {
+            stats.tripleBufferedTime += segment.totalTime;
+        }
+        ++stats.numSegments;
+        stats.totalTime += segment.totalTime;
+    }
+}
+
+void SurfaceFlinger::dumpBufferingStats(String8& result) const {
+    result.append("Buffering stats:\n");
+    result.append("  [Layer name] <Active time> <Two buffer> "
+            "<Double buffered> <Triple buffered>\n");
+    Mutex::Autolock lock(mBufferingStatsMutex);
+    typedef std::tuple<std::string, float, float, float> BufferTuple;
+    std::map<float, BufferTuple, std::greater<float>> sorted;
+    for (const auto& statsPair : mBufferingStats) {
+        const char* name = statsPair.first.c_str();
+        const BufferingStats& stats = statsPair.second;
+        if (stats.numSegments == 0) {
+            continue;
+        }
+        float activeTime = ns2ms(stats.totalTime) / 1000.0f;
+        float twoBufferRatio = static_cast<float>(stats.twoBufferTime) /
+                stats.totalTime;
+        float doubleBufferRatio = static_cast<float>(
+                stats.doubleBufferedTime) / stats.totalTime;
+        float tripleBufferRatio = static_cast<float>(
+                stats.tripleBufferedTime) / stats.totalTime;
+        sorted.insert({activeTime, {name, twoBufferRatio,
+                doubleBufferRatio, tripleBufferRatio}});
+    }
+    for (const auto& sortedPair : sorted) {
+        float activeTime = sortedPair.first;
+        const BufferTuple& values = sortedPair.second;
+        result.appendFormat("  [%s] %.2f %.3f %.3f %.3f\n",
+                std::get<0>(values).c_str(), activeTime,
+                std::get<1>(values), std::get<2>(values),
+                std::get<3>(values));
+    }
+    result.append("\n");
+}
+
 void SurfaceFlinger::dumpAllLocked(const Vector<String16>& args, size_t& index,
         String8& result) const
 {
@@ -2802,6 +2848,8 @@
     dumpStaticScreenStats(result);
     result.append("\n");
 
+    dumpBufferingStats(result);
+
     /*
      * Dump the visible layer list
      */
@@ -3548,6 +3596,11 @@
     return result;
 }
 
+bool SurfaceFlinger::getFrameTimestamps(const Layer& layer,
+        uint64_t frameNumber, FrameTimestamps* outTimestamps) {
+    return mFenceTracker.getFrameTimestamps(layer, frameNumber, outTimestamps);
+}
+
 void SurfaceFlinger::checkScreenshot(size_t w, size_t s, size_t h, void const* vaddr,
         const sp<const DisplayDevice>& hw, uint32_t minLayerZ, uint32_t maxLayerZ) {
     if (DEBUG_SCREENSHOTS) {
diff --git a/services/surfaceflinger/surfaceflinger.rc b/services/surfaceflinger/surfaceflinger.rc
index 2b4ea2a..435aa0c 100644
--- a/services/surfaceflinger/surfaceflinger.rc
+++ b/services/surfaceflinger/surfaceflinger.rc
@@ -3,4 +3,4 @@
     user system
     group graphics drmrpc readproc
     onrestart restart zygote
-    writepid /sys/fs/cgroup/stune/foreground/tasks
+    writepid /dev/stune/foreground/tasks