Merge "Add trace_event_clock_sync to atrace" (0faebfb2) · Commits · e / os / platform_frameworks_native

cmds/atrace/atrace.cpp

+13 −0

Original line number	Diff line number	Diff line
		@@ -35,6 +35,7 @@
		#include <cutils/properties.h>

		#include <utils/String8.h>
		#include <utils/Timers.h>
		#include <utils/Trace.h>

		using namespace android;
		@@ -192,6 +193,9 @@ static const char* k_tracingOnPath =
		static const char* k_tracePath =
		"/sys/kernel/debug/tracing/trace";

		static const char* k_traceMarkerPath =
		"/sys/kernel/debug/tracing/trace_marker";

		// Check whether a file exists.
		static bool fileExists(const char* filename) {
		return access(filename, F_OK) != -1;
		@@ -254,6 +258,14 @@ static bool appendStr(const char* filename, const char* str)
		return _writeStr(filename, str, O_APPEND\|O_WRONLY);
		}

		static void writeClockSyncMarker()
		{
		char buffer[128];
		float now_in_seconds = systemTime(CLOCK_MONOTONIC) / 1000000000.0f;
		snprintf(buffer, 128, "trace_event_clock_sync: parent_ts=%f\n", now_in_seconds);
		writeStr(k_traceMarkerPath, buffer);
		}

		// Enable or disable a kernel option by writing a "1" or a "0" into a /sys
		// file.
		static bool setKernelOptionEnable(const char* filename, bool enable)
		@@ -631,6 +643,7 @@ static bool startTrace()
		// Disable tracing in the kernel.
		static void stopTrace()
		{
		writeClockSyncMarker();
		setTracingEnabled(false);
		}