ADHOC/replicant-frameworks_native
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Map realtime to clock_monotonic.

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This maps a monotonic timestamp to the
corresponding real-time timestamp, which
can be used to match up the traces with
other logs that use real-time.

Also write clock_sync records first instead of at
the end, to avoid not being to write it due to the
buffer being full.

Bug: 23668823
Change-Id: I644aeea496197e194ec30f808f754e3e043d905f
This commit is contained in:
Martijn Coenen 2015-07-15 14:25:23 +02:00
parent 8f35ca9730
commit 0bcd97a748
1 changed files with 21 additions and 3 deletions
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24
cmds/atrace/atrace.cpp
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@ -264,9 +264,27 @@ static bool appendStr(const char* filename, const char* str)
static void writeClockSyncMarker()
{
char buffer[128];
int len = 0;
int fd = open(k_traceMarkerPath, O_WRONLY);
if (fd == -1) {
fprintf(stderr, "error opening %s: %s (%d)\n", k_traceMarkerPath,
strerror(errno), errno);
return;
}
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);
len = snprintf(buffer, 128, "trace_event_clock_sync: parent_ts=%f\n", now_in_seconds);
if (write(fd, buffer, len) != len) {
fprintf(stderr, "error writing clock sync marker %s (%d)\n", strerror(errno), errno);
}
int64_t realtime_in_ms = systemTime(CLOCK_REALTIME) / 1000000;
len = snprintf(buffer, 128, "trace_event_clock_sync: realtime_ts=%" PRId64 "\n", realtime_in_ms);
if (write(fd, buffer, len) != len) {
fprintf(stderr, "error writing clock sync marker %s (%d)\n", strerror(errno), errno);
}
close(fd);
}
// Enable or disable a kernel option by writing a "1" or a "0" into a /sys
@ -646,7 +664,6 @@ static bool startTrace()
// Disable tracing in the kernel.
static void stopTrace()
{
writeClockSyncMarker();
setTracingEnabled(false);
}
@ -940,6 +957,7 @@ int main(int argc, char **argv)
// another.
ok = clearTrace();
writeClockSyncMarker();
if (ok && !async) {
// Sleep to allow the trace to be captured.
struct timespec timeLeft;