commit 90092f4335b7360b149a57ee759df778e099ff87
author Mikael Pessa <mikaelpessa@google.com> Mon Aug 26 17:22:04 2019 -0700
committer Yiwei Zhang <zzyiwei@google.com> Fri Aug 30 17:46:03 2019 +0000
tree 5725e9600ce49c70c3ced8b2d73a6ab70e76ba90
parent 7fcea26183280ad81d09835c8fabf4fe095e3300

Refactor: Pull tracing out of TimeStats.

The tracing in TimeStats ended up having no actual overlap with current
TimeStats functionality. This CL pulls all tracing related code out
into its own class.

Test: atest libsurfaceflinger_unittest and manually inspected traces.

Run trace with:
{ adb shell perfetto -c - --txt -o /data/misc/perfetto-traces/trace <<EOF
buffers: {
    size_kb: 1280
}
data_sources: {
    config {
        name: "android.surfaceflinger.frame"
    }
}
duration_ms: 3000
EOF
} && adb pull /data/misc/perfetto-traces/trace ~/Desktop/trace

Fixes: 140298240
Change-Id: I52d80d46eb8dee8979b02416ab7a758b7e58dfd1

services/surfaceflinger/SurfaceFlinger.cpp

diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 6543089..e8902b3 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -98,6 +98,7 @@
 #include "DisplayHardware/HWComposer.h"
 #include "DisplayHardware/VirtualDisplaySurface.h"
 #include "Effects/Daltonizer.h"
+#include "FrameTracer/FrameTracer.h"
 #include "RegionSamplingThread.h"
 #include "Scheduler/DispSync.h"
 #include "Scheduler/DispSyncSource.h"
@@ -257,6 +258,7 @@
       : mFactory(factory),
         mInterceptor(mFactory.createSurfaceInterceptor(this)),
         mTimeStats(mFactory.createTimeStats()),
+        mFrameTracer(std::make_unique<FrameTracer>()),
         mEventQueue(mFactory.createMessageQueue()),
         mCompositionEngine(mFactory.createCompositionEngine()),
         mPhaseOffsets(mFactory.createPhaseOffsets()) {}
@@ -513,7 +515,7 @@
     const nsecs_t duration = now - mBootTime;
     ALOGI("Boot is finished (%ld ms)", long(ns2ms(duration)) );
 
-    mTimeStats->initializeTracing();
+    mFrameTracer->initialize();
 
     // wait patiently for the window manager death
     const String16 name("window");