#include <cutils/properties.h>
#include <utils/String8.h>
+#include <utils/Timers.h>
#include <utils/Trace.h>
using namespace android;
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;
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)
// Disable tracing in the kernel.
static void stopTrace()
{
+ writeClockSyncMarker();
setTracingEnabled(false);
}