diff --git a/media/libmedia/Android.mk b/media/libmedia/Android.mk
index f2b6441..a35d562 100644
--- a/media/libmedia/Android.mk
+++ b/media/libmedia/Android.mk
@@ -13,6 +13,7 @@
 
 LOCAL_SRC_FILES:= \
     AudioTrack.cpp \
+    AudioTrackShared.cpp \
     IAudioFlinger.cpp \
     IAudioFlingerClient.cpp \
     IAudioTrack.cpp \
diff --git a/media/libmedia/AudioTrack.cpp b/media/libmedia/AudioTrack.cpp
index ac672a7..1d87ff8 100644
--- a/media/libmedia/AudioTrack.cpp
+++ b/media/libmedia/AudioTrack.cpp
@@ -1482,180 +1482,4 @@
     }
 }
 
-// =========================================================================
-
-
-audio_track_cblk_t::audio_track_cblk_t()
-    : lock(Mutex::SHARED), cv(Condition::SHARED), user(0), server(0),
-    userBase(0), serverBase(0), frameCount_(0),
-    loopStart(UINT_MAX), loopEnd(UINT_MAX), loopCount(0), mVolumeLR(0x10001000),
-    mSendLevel(0), flags(0)
-{
-}
-
-uint32_t audio_track_cblk_t::stepUser(size_t stepCount, size_t frameCount, bool isOut)
-{
-    ALOGV("stepuser %08x %08x %d", user, server, stepCount);
-
-    uint32_t u = user;
-    u += stepCount;
-    // Ensure that user is never ahead of server for AudioRecord
-    if (isOut) {
-        // If stepServer() has been called once, switch to normal obtainBuffer() timeout period
-        if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS-1) {
-            bufferTimeoutMs = MAX_RUN_TIMEOUT_MS;
-        }
-    } else if (u > server) {
-        ALOGW("stepUser occurred after track reset");
-        u = server;
-    }
-
-    if (u >= frameCount) {
-        // common case, user didn't just wrap
-        if (u - frameCount >= userBase ) {
-            userBase += frameCount;
-        }
-    } else if (u >= userBase + frameCount) {
-        // user just wrapped
-        userBase += frameCount;
-    }
-
-    user = u;
-
-    // Clear flow control error condition as new data has been written/read to/from buffer.
-    if (flags & CBLK_UNDERRUN) {
-        android_atomic_and(~CBLK_UNDERRUN, &flags);
-    }
-
-    return u;
-}
-
-bool audio_track_cblk_t::stepServer(size_t stepCount, size_t frameCount, bool isOut)
-{
-    ALOGV("stepserver %08x %08x %d", user, server, stepCount);
-
-    if (!tryLock()) {
-        ALOGW("stepServer() could not lock cblk");
-        return false;
-    }
-
-    uint32_t s = server;
-    bool flushed = (s == user);
-
-    s += stepCount;
-    if (isOut) {
-        // Mark that we have read the first buffer so that next time stepUser() is called
-        // we switch to normal obtainBuffer() timeout period
-        if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS) {
-            bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS - 1;
-        }
-        // It is possible that we receive a flush()
-        // while the mixer is processing a block: in this case,
-        // stepServer() is called After the flush() has reset u & s and
-        // we have s > u
-        if (flushed) {
-            ALOGW("stepServer occurred after track reset");
-            s = user;
-        }
-    }
-
-    if (s >= loopEnd) {
-        ALOGW_IF(s > loopEnd, "stepServer: s %u > loopEnd %u", s, loopEnd);
-        s = loopStart;
-        if (--loopCount == 0) {
-            loopEnd = UINT_MAX;
-            loopStart = UINT_MAX;
-        }
-    }
-
-    if (s >= frameCount) {
-        // common case, server didn't just wrap
-        if (s - frameCount >= serverBase ) {
-            serverBase += frameCount;
-        }
-    } else if (s >= serverBase + frameCount) {
-        // server just wrapped
-        serverBase += frameCount;
-    }
-
-    server = s;
-
-    if (!(flags & CBLK_INVALID)) {
-        cv.signal();
-    }
-    lock.unlock();
-    return true;
-}
-
-void* audio_track_cblk_t::buffer(void *buffers, size_t frameSize, uint32_t offset) const
-{
-    return (int8_t *)buffers + (offset - userBase) * frameSize;
-}
-
-uint32_t audio_track_cblk_t::framesAvailable(size_t frameCount, bool isOut)
-{
-    Mutex::Autolock _l(lock);
-    return framesAvailable_l(frameCount, isOut);
-}
-
-uint32_t audio_track_cblk_t::framesAvailable_l(size_t frameCount, bool isOut)
-{
-    uint32_t u = user;
-    uint32_t s = server;
-
-    if (isOut) {
-        uint32_t limit = (s < loopStart) ? s : loopStart;
-        return limit + frameCount - u;
-    } else {
-        return frameCount + u - s;
-    }
-}
-
-uint32_t audio_track_cblk_t::framesReady(bool isOut)
-{
-    uint32_t u = user;
-    uint32_t s = server;
-
-    if (isOut) {
-        if (u < loopEnd) {
-            return u - s;
-        } else {
-            // do not block on mutex shared with client on AudioFlinger side
-            if (!tryLock()) {
-                ALOGW("framesReady() could not lock cblk");
-                return 0;
-            }
-            uint32_t frames = UINT_MAX;
-            if (loopCount >= 0) {
-                frames = (loopEnd - loopStart)*loopCount + u - s;
-            }
-            lock.unlock();
-            return frames;
-        }
-    } else {
-        return s - u;
-    }
-}
-
-bool audio_track_cblk_t::tryLock()
-{
-    // the code below simulates lock-with-timeout
-    // we MUST do this to protect the AudioFlinger server
-    // as this lock is shared with the client.
-    status_t err;
-
-    err = lock.tryLock();
-    if (err == -EBUSY) { // just wait a bit
-        usleep(1000);
-        err = lock.tryLock();
-    }
-    if (err != NO_ERROR) {
-        // probably, the client just died.
-        return false;
-    }
-    return true;
-}
-
-// -------------------------------------------------------------------------
-
 }; // namespace android
diff --git a/media/libmedia/AudioTrackShared.cpp b/media/libmedia/AudioTrackShared.cpp
new file mode 100644
index 0000000..bee13c8
--- /dev/null
+++ b/media/libmedia/AudioTrackShared.cpp
@@ -0,0 +1,196 @@
+/*
+ * Copyright (C) 2007 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.
+ */
+
+#define LOG_TAG "AudioTrackShared"
+//#define LOG_NDEBUG 0
+
+#include <private/media/AudioTrackShared.h>
+#include <utils/Log.h>
+
+namespace android {
+
+audio_track_cblk_t::audio_track_cblk_t()
+    : lock(Mutex::SHARED), cv(Condition::SHARED), user(0), server(0),
+    userBase(0), serverBase(0), frameCount_(0),
+    loopStart(UINT_MAX), loopEnd(UINT_MAX), loopCount(0), mVolumeLR(0x10001000),
+    mSendLevel(0), flags(0)
+{
+}
+
+uint32_t audio_track_cblk_t::stepUser(size_t stepCount, size_t frameCount, bool isOut)
+{
+    ALOGV("stepuser %08x %08x %d", user, server, stepCount);
+
+    uint32_t u = user;
+    u += stepCount;
+    // Ensure that user is never ahead of server for AudioRecord
+    if (isOut) {
+        // If stepServer() has been called once, switch to normal obtainBuffer() timeout period
+        if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS-1) {
+            bufferTimeoutMs = MAX_RUN_TIMEOUT_MS;
+        }
+    } else if (u > server) {
+        ALOGW("stepUser occurred after track reset");
+        u = server;
+    }
+
+    if (u >= frameCount) {
+        // common case, user didn't just wrap
+        if (u - frameCount >= userBase ) {
+            userBase += frameCount;
+        }
+    } else if (u >= userBase + frameCount) {
+        // user just wrapped
+        userBase += frameCount;
+    }
+
+    user = u;
+
+    // Clear flow control error condition as new data has been written/read to/from buffer.
+    if (flags & CBLK_UNDERRUN) {
+        android_atomic_and(~CBLK_UNDERRUN, &flags);
+    }
+
+    return u;
+}
+
+bool audio_track_cblk_t::stepServer(size_t stepCount, size_t frameCount, bool isOut)
+{
+    ALOGV("stepserver %08x %08x %d", user, server, stepCount);
+
+    if (!tryLock()) {
+        ALOGW("stepServer() could not lock cblk");
+        return false;
+    }
+
+    uint32_t s = server;
+    bool flushed = (s == user);
+
+    s += stepCount;
+    if (isOut) {
+        // Mark that we have read the first buffer so that next time stepUser() is called
+        // we switch to normal obtainBuffer() timeout period
+        if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS) {
+            bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS - 1;
+        }
+        // It is possible that we receive a flush()
+        // while the mixer is processing a block: in this case,
+        // stepServer() is called After the flush() has reset u & s and
+        // we have s > u
+        if (flushed) {
+            ALOGW("stepServer occurred after track reset");
+            s = user;
+        }
+    }
+
+    if (s >= loopEnd) {
+        ALOGW_IF(s > loopEnd, "stepServer: s %u > loopEnd %u", s, loopEnd);
+        s = loopStart;
+        if (--loopCount == 0) {
+            loopEnd = UINT_MAX;
+            loopStart = UINT_MAX;
+        }
+    }
+
+    if (s >= frameCount) {
+        // common case, server didn't just wrap
+        if (s - frameCount >= serverBase ) {
+            serverBase += frameCount;
+        }
+    } else if (s >= serverBase + frameCount) {
+        // server just wrapped
+        serverBase += frameCount;
+    }
+
+    server = s;
+
+    if (!(flags & CBLK_INVALID)) {
+        cv.signal();
+    }
+    lock.unlock();
+    return true;
+}
+
+void* audio_track_cblk_t::buffer(void *buffers, size_t frameSize, uint32_t offset) const
+{
+    return (int8_t *)buffers + (offset - userBase) * frameSize;
+}
+
+uint32_t audio_track_cblk_t::framesAvailable(size_t frameCount, bool isOut)
+{
+    Mutex::Autolock _l(lock);
+    return framesAvailable_l(frameCount, isOut);
+}
+
+uint32_t audio_track_cblk_t::framesAvailable_l(size_t frameCount, bool isOut)
+{
+    uint32_t u = user;
+    uint32_t s = server;
+
+    if (isOut) {
+        uint32_t limit = (s < loopStart) ? s : loopStart;
+        return limit + frameCount - u;
+    } else {
+        return frameCount + u - s;
+    }
+}
+
+uint32_t audio_track_cblk_t::framesReady(bool isOut)
+{
+    uint32_t u = user;
+    uint32_t s = server;
+
+    if (isOut) {
+        if (u < loopEnd) {
+            return u - s;
+        } else {
+            // do not block on mutex shared with client on AudioFlinger side
+            if (!tryLock()) {
+                ALOGW("framesReady() could not lock cblk");
+                return 0;
+            }
+            uint32_t frames = UINT_MAX;
+            if (loopCount >= 0) {
+                frames = (loopEnd - loopStart)*loopCount + u - s;
+            }
+            lock.unlock();
+            return frames;
+        }
+    } else {
+        return s - u;
+    }
+}
+
+bool audio_track_cblk_t::tryLock()
+{
+    // the code below simulates lock-with-timeout
+    // we MUST do this to protect the AudioFlinger server
+    // as this lock is shared with the client.
+    status_t err;
+
+    err = lock.tryLock();
+    if (err == -EBUSY) { // just wait a bit
+        usleep(1000);
+        err = lock.tryLock();
+    }
+    if (err != NO_ERROR) {
+        // probably, the client just died.
+        return false;
+    }
+    return true;
+}
+
+}   // namespace android
diff --git a/services/audioflinger/Android.mk b/services/audioflinger/Android.mk
index dc65833..6d42143 100644
--- a/services/audioflinger/Android.mk
+++ b/services/audioflinger/Android.mk
@@ -78,6 +78,13 @@
 # LOCAL_SRC_FILES += AudioWatchdog.cpp
 # LOCAL_CFLAGS += -DAUDIO_WATCHDOG
 
+# Define ANDROID_SMP appropriately. Used to get inline tracing fast-path.
+ifeq ($(TARGET_CPU_SMP),true)
+    LOCAL_CFLAGS += -DANDROID_SMP=1
+else
+    LOCAL_CFLAGS += -DANDROID_SMP=0
+endif
+
 include $(BUILD_SHARED_LIBRARY)
 
 #
diff --git a/services/audioflinger/FastMixer.cpp b/services/audioflinger/FastMixer.cpp
index 0366dfe..5e6af16 100644
--- a/services/audioflinger/FastMixer.cpp
+++ b/services/audioflinger/FastMixer.cpp
@@ -17,10 +17,7 @@
 #define LOG_TAG "FastMixer"
 //#define LOG_NDEBUG 0
 
-/** Uncomment for systrace.
- * ATRACE_TAG will default to ATRACE_TAG_NEVER in the header.
- */
-//#define ATRACE_TAG ATRACE_TAG_AUDIO
+#define ATRACE_TAG ATRACE_TAG_AUDIO
 
 #include <sys/atomics.h>
 #include <time.h>
@@ -376,14 +373,14 @@
                 // up to 1 ms.  If enough active tracks all blocked in sequence, this would result
                 // in the overall fast mix cycle being delayed.  Should use a non-blocking FIFO.
                 size_t framesReady = fastTrack->mBufferProvider->framesReady();
-#if defined(ATRACE_TAG) && (ATRACE_TAG != ATRACE_TAG_NEVER)
-                // I wish we had formatted trace names
-                char traceName[16];
-                strcpy(traceName, "framesReady");
-                traceName[11] = i + (i < 10 ? '0' : 'A' - 10);
-                traceName[12] = '\0';
-                ATRACE_INT(traceName, framesReady);
-#endif
+                if (ATRACE_ENABLED()) {
+                    // I wish we had formatted trace names
+                    char traceName[16];
+                    strcpy(traceName, "framesReady");
+                    traceName[11] = i + (i < 10 ? '0' : 'A' - 10);
+                    traceName[12] = '\0';
+                    ATRACE_INT(traceName, framesReady);
+                }
                 FastTrackDump *ftDump = &dumpState->mTracks[i];
                 FastTrackUnderruns underruns = ftDump->mUnderruns;
                 if (framesReady < frameCount) {
@@ -429,13 +426,9 @@
             // FIXME write() is non-blocking and lock-free for a properly implemented NBAIO sink,
             //       but this code should be modified to handle both non-blocking and blocking sinks
             dumpState->mWriteSequence++;
-#if defined(ATRACE_TAG) && (ATRACE_TAG != ATRACE_TAG_NEVER)
             ATRACE_BEGIN("write");
-#endif
             ssize_t framesWritten = outputSink->write(mixBuffer, frameCount);
-#if defined(ATRACE_TAG) && (ATRACE_TAG != ATRACE_TAG_NEVER)
             ATRACE_END();
-#endif
             dumpState->mWriteSequence++;
             if (framesWritten >= 0) {
                 ALOG_ASSERT(framesWritten <= frameCount);
@@ -490,9 +483,7 @@
                 sleepNs = -1;
               if (isWarm) {
                 if (sec > 0 || nsec > underrunNs) {
-#if defined(ATRACE_TAG) && (ATRACE_TAG != ATRACE_TAG_NEVER)
-                    ScopedTrace st(ATRACE_TAG, "underrun");
-#endif
+                    ATRACE_NAME("underrun");
                     // FIXME only log occasionally
                     ALOGV("underrun: time since last cycle %d.%03ld sec",
                             (int) sec, nsec / 1000000L);
@@ -572,10 +563,8 @@
                 // this store #4 is not atomic with respect to stores #1, #2, #3 above, but
                 // the newest open and oldest closed halves are atomic with respect to each other
                 dumpState->mBounds = bounds;
-#if defined(ATRACE_TAG) && (ATRACE_TAG != ATRACE_TAG_NEVER)
                 ATRACE_INT("cycle_ms", monotonicNs / 1000000);
                 ATRACE_INT("load_us", loadNs / 1000);
-#endif
               }
 #endif
             } else {