liblog: logd: Add android_lookupEventTag_len()
Allows us to mitigate the impact of MAP_PRIVATE and copy on write by
calling android_lookupEventTag_len instead of android_lookupEventTag,
and delaying the copy on write impact to the later. We return a
string length in a supplied location along with the string pointer
with android_lookupEventTag_len(const EventTagMap* map, size_t* len,
int tag). The string is not guaranteed to be nul terminated. Since
android_lookupEventTag() called even once can cause the memory
impact, we will mark it as deprecated, but we currently have no
timeframe for removal since this is a very old interface.
Add an API for __android_log_is_loggable_len() that accepts the non
null terminated content and fixup callers that would gain because the
length is known prior to the call either in the compiler or at
runtime. Tackle transition to android_lookupEventTag_len() and
fixup callers.
On any application that performs logging (eg: com.android.phone)
/proc/<pid>/smaps before:
xxxxxxxxxx-xxxxxxxxxx rw-p 00000000 fd:00 463 /system/etc/event-log-tags
Size: 20 kB
Rss: 20 kB
Pss: 1 kB
Shared_Clean: 0 kB
Shared_Dirty: 20 kB
Private_Clean: 0 kB
Private_Dirty: 0 kB
Referenced: 0 kB
Anonymous: 20 kB
AnonHugePages: 0 kB
Swap: 0 kB
SwapPss: 0 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Locked: 0 kB
VmFlags: rd wr mr mw me ac
/proc/<pid>/smaps after:
xxxxxxxxxx-xxxxxxxxxx rw-p 00000000 fd:00 1773 /system/etc/event-log-tags
Size: 20 kB
Rss: 20 kB
Pss: 1 kB
Shared_Clean: 20 kB (was 0kB)
Shared_Dirty: 0 kB (was 20kB)
Private_Clean: 0 kB
Private_Dirty: 0 kB
Referenced: 20 kB (was 0kB)
Anonymous: 0 kB (was 20kB)
AnonHugePages: 0 kB
Swap: 0 kB
SwapPss: 0 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Locked: 0 kB
VmFlags: rd wr mr mw me ac
Added liblog-unit-tests --gtest_filter=liblog.event_log_tags to
check for Shared_Clean: to not be 0 and Anonymous: to be 0 for
all processes referencing event-log-tags. Which can include multiple
references to /system/etc/event-log-tags and future possible refs to
/data/misc/logd/event-log-tags and /dev/event-log-tags. We want
failure messages to help point to errant code using the deprecated
interface.
This change saves 1/4MB of memory or more on a typical system.
Test: gTest liblog-unit-tests
Bug: 31456426
Change-Id: I9e08e44d9092bd96fe704b5709242e7195281d33
diff --git a/liblog/tests/Android.mk b/liblog/tests/Android.mk
index 8229859..a755b98 100644
--- a/liblog/tests/Android.mk
+++ b/liblog/tests/Android.mk
@@ -40,7 +40,7 @@
LOCAL_MODULE := $(test_module_prefix)benchmarks
LOCAL_MODULE_TAGS := $(test_tags)
LOCAL_CFLAGS += $(benchmark_c_flags)
-LOCAL_SHARED_LIBRARIES += liblog libm
+LOCAL_SHARED_LIBRARIES += liblog libm libbase
LOCAL_SRC_FILES := $(benchmark_src_files)
include $(BUILD_NATIVE_TEST)
@@ -73,6 +73,6 @@
LOCAL_MODULE := $(test_module_prefix)unit-tests
LOCAL_MODULE_TAGS := $(test_tags)
LOCAL_CFLAGS += $(test_c_flags)
-LOCAL_SHARED_LIBRARIES := liblog libcutils
+LOCAL_SHARED_LIBRARIES := liblog libcutils libbase
LOCAL_SRC_FILES := $(test_src_files)
include $(BUILD_NATIVE_TEST)
diff --git a/liblog/tests/liblog_benchmark.cpp b/liblog/tests/liblog_benchmark.cpp
index 7561d8f..cd012ce 100644
--- a/liblog/tests/liblog_benchmark.cpp
+++ b/liblog/tests/liblog_benchmark.cpp
@@ -650,10 +650,14 @@
* Measure the time it takes for __android_log_is_loggable.
*/
static void BM_is_loggable(int iters) {
+ static const char logd[] = "logd";
+
StartBenchmarkTiming();
for (int i = 0; i < iters; ++i) {
- __android_log_is_loggable(ANDROID_LOG_WARN, "logd", ANDROID_LOG_VERBOSE);
+ __android_log_is_loggable_len(ANDROID_LOG_WARN,
+ logd, strlen(logd),
+ ANDROID_LOG_VERBOSE);
}
StopBenchmarkTiming();
diff --git a/liblog/tests/liblog_test.cpp b/liblog/tests/liblog_test.cpp
index 6e709a9..b1dae9e 100644
--- a/liblog/tests/liblog_test.cpp
+++ b/liblog/tests/liblog_test.cpp
@@ -14,6 +14,8 @@
* limitations under the License.
*/
+#include <ctype.h>
+#include <dirent.h>
#include <fcntl.h>
#include <inttypes.h>
#include <semaphore.h>
@@ -22,7 +24,11 @@
#include <sys/types.h>
#include <unistd.h>
+#include <string>
+
#include <android/log.h>
+#include <android-base/file.h>
+#include <android-base/stringprintf.h>
#include <cutils/properties.h>
#include <gtest/gtest.h>
#include <log/logger.h>
@@ -1337,8 +1343,8 @@
continue;
}
fprintf(stderr, "i=%zu j=%zu\r", i, j);
- bool android_log_is_loggable = __android_log_is_loggable(
- levels[i].level, tag, levels[j].level);
+ bool android_log_is_loggable = __android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), levels[j].level);
if ((levels[i].level < levels[j].level)
|| (levels[j].level == -1)) {
if (android_log_is_loggable) {
@@ -1346,8 +1352,8 @@
}
EXPECT_FALSE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_FALSE(__android_log_is_loggable(
- levels[i].level, tag, levels[j].level));
+ EXPECT_FALSE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), levels[j].level));
}
} else {
if (!android_log_is_loggable) {
@@ -1355,8 +1361,8 @@
}
EXPECT_TRUE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_TRUE(__android_log_is_loggable(
- levels[i].level, tag, levels[j].level));
+ EXPECT_TRUE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), levels[j].level));
}
}
}
@@ -1377,8 +1383,8 @@
i, j, key, buf);
usleep(20000);
property_set(key, buf);
- bool android_log_is_loggable = __android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG);
+ bool android_log_is_loggable = __android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG);
if ((levels[i].level < levels[j].level)
|| (levels[j].level == -1)
|| ((levels[i].level < ANDROID_LOG_DEBUG)
@@ -1388,8 +1394,8 @@
}
EXPECT_FALSE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_FALSE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_FALSE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
} else {
if (!android_log_is_loggable) {
@@ -1397,8 +1403,8 @@
}
EXPECT_TRUE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_TRUE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_TRUE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
}
usleep(20000);
@@ -1407,8 +1413,8 @@
fprintf(stderr, "i=%zu j=%zu property_set(\"%s\",\"%s\")\r",
i, j, key + base_offset, buf);
property_set(key + base_offset, buf);
- android_log_is_loggable = __android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG);
+ android_log_is_loggable = __android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG);
if ((levels[i].level < levels[j].level)
|| (levels[j].level == -1)
|| ((levels[i].level < ANDROID_LOG_DEBUG)
@@ -1418,8 +1424,8 @@
}
EXPECT_FALSE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_FALSE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_FALSE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
} else {
if (!android_log_is_loggable) {
@@ -1427,8 +1433,8 @@
}
EXPECT_TRUE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_TRUE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_TRUE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
}
usleep(20000);
@@ -1439,8 +1445,8 @@
fprintf(stderr, "i=%zu j=%zu property_set(\"%s\",\"%s\")\r",
i, j, key, buf);
property_set(key, buf);
- android_log_is_loggable = __android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG);
+ android_log_is_loggable = __android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG);
if ((levels[i].level < levels[j].level)
|| (levels[j].level == -1)
|| ((levels[i].level < ANDROID_LOG_DEBUG)
@@ -1450,8 +1456,8 @@
}
EXPECT_FALSE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_FALSE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_FALSE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
} else {
if (!android_log_is_loggable) {
@@ -1459,8 +1465,8 @@
}
EXPECT_TRUE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_TRUE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_TRUE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
}
usleep(20000);
@@ -1469,8 +1475,8 @@
fprintf(stderr, "i=%zu j=%zu property_set(\"%s\",\"%s\")\r",
i, j, key + base_offset, buf);
property_set(key + base_offset, buf);
- android_log_is_loggable = __android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG);
+ android_log_is_loggable = __android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG);
if ((levels[i].level < levels[j].level)
|| (levels[j].level == -1)
|| ((levels[i].level < ANDROID_LOG_DEBUG)
@@ -1480,8 +1486,8 @@
}
EXPECT_FALSE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_FALSE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_FALSE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
} else {
if (!android_log_is_loggable) {
@@ -1489,8 +1495,8 @@
}
EXPECT_TRUE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_TRUE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_TRUE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
}
usleep(20000);
@@ -1517,8 +1523,8 @@
i, j, key, buf);
usleep(20000);
property_set(key, buf);
- bool android_log_is_loggable = __android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG);
+ bool android_log_is_loggable = __android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG);
if ((levels[i].level < levels[j].level)
|| (levels[j].level == -1)
|| ((levels[i].level < ANDROID_LOG_INFO) // Yes INFO
@@ -1528,8 +1534,8 @@
}
EXPECT_FALSE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_FALSE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_FALSE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
} else {
if (!android_log_is_loggable) {
@@ -1537,8 +1543,8 @@
}
EXPECT_TRUE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_TRUE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_TRUE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
}
usleep(20000);
@@ -1547,8 +1553,8 @@
fprintf(stderr, "i=%zu j=%zu property_set(\"%s\",\"%s\")\r",
i, j, key + base_offset, buf);
property_set(key + base_offset, buf);
- android_log_is_loggable = __android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG);
+ android_log_is_loggable = __android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG);
if ((levels[i].level < levels[j].level)
|| (levels[j].level == -1)
|| ((levels[i].level < ANDROID_LOG_INFO) // Yes INFO
@@ -1558,8 +1564,8 @@
}
EXPECT_FALSE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_FALSE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_FALSE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
} else {
if (!android_log_is_loggable) {
@@ -1567,8 +1573,8 @@
}
EXPECT_TRUE(android_log_is_loggable);
for(size_t k = 10; k; --k) {
- EXPECT_TRUE(__android_log_is_loggable(
- levels[i].level, tag, ANDROID_LOG_DEBUG));
+ EXPECT_TRUE(__android_log_is_loggable_len(
+ levels[i].level, tag, strlen(tag), ANDROID_LOG_DEBUG));
}
}
usleep(20000);
@@ -2617,3 +2623,83 @@
EXPECT_LT(0, ret);
EXPECT_EQ(1U, signaled);
}
+
+// meant to be handed to ASSERT_TRUE / EXPECT_TRUE only to expand the message
+static testing::AssertionResult IsOk(bool ok, std::string &message) {
+ return ok ?
+ testing::AssertionSuccess() :
+ (testing::AssertionFailure() << message);
+}
+
+static void event_log_tags_test_smap(pid_t pid) {
+ std::string filename = android::base::StringPrintf("/proc/%d/smaps", pid);
+
+ std::string content;
+ if (!android::base::ReadFileToString(filename, &content)) return;
+
+ bool shared_ok = false;
+ bool anonymous_ok = false;
+ bool pass_ok = false;
+
+ static const char event_log_tags[] = "event-log-tags";
+ std::string::size_type pos = 0;
+ while ((pos = content.find(event_log_tags, pos)) != std::string::npos) {
+ pos += strlen(event_log_tags);
+
+ // must not be: 'Shared_Clean: 0 kB'
+ static const char shared_clean[] = "Shared_Clean:";
+ std::string::size_type clean = content.find(shared_clean, pos);
+ bool ok = (clean != std::string::npos) &&
+ ((clean = content.find_first_not_of(" \t", clean +
+ strlen(shared_clean))) != std::string::npos) &&
+ (content.find_first_not_of("123456789", clean) != clean);
+ if (ok && !pass_ok) {
+ shared_ok = true;
+ } else if (!ok) {
+ shared_ok = false;
+ }
+
+ // must be: 'Anonymous: 0 kB'
+ static const char anonymous[] = "Anonymous:";
+ std::string::size_type anon = content.find(anonymous, pos);
+ ok = (anon != std::string::npos) &&
+ ((anon = content.find_first_not_of(" \t", anon +
+ strlen(anonymous))) != std::string::npos) &&
+ (content.find_first_not_of("0", anon) != anon);
+ if (ok && !pass_ok) {
+ anonymous_ok = true;
+ } else if (!ok) {
+ anonymous_ok = false;
+ }
+
+ pass_ok = true;
+ }
+ content = "";
+
+ if (!pass_ok) return;
+ if (shared_ok && anonymous_ok) return;
+
+ filename = android::base::StringPrintf("/proc/%d/comm", pid);
+ android::base::ReadFileToString(filename, &content);
+ content = android::base::StringPrintf("%d:%s",
+ pid, content.substr(0, content.find("\n")).c_str());
+
+ EXPECT_TRUE(IsOk(shared_ok, content));
+ EXPECT_TRUE(IsOk(anonymous_ok, content));
+}
+
+TEST(liblog, event_log_tags) {
+ std::unique_ptr<DIR, int(*)(DIR*)> proc_dir(opendir("/proc"), closedir);
+ ASSERT_FALSE(!proc_dir);
+
+ dirent* e;
+ while ((e = readdir(proc_dir.get()))) {
+ if (e->d_type != DT_DIR) continue;
+ if (!isdigit(e->d_name[0])) continue;
+ long long id = atoll(e->d_name);
+ if (id <= 0) continue;
+ pid_t pid = id;
+ if (id != pid) continue;
+ event_log_tags_test_smap(pid);
+ }
+}