systrace don't support async timeline events #39726
Description
For example, async events in Flutter engine:
TRACE_EVENT_ASYNC_BEGIN0("flutter", "Frame Request Pending", frame_number);
...
TRACE_EVENT_ASYNC_END0("flutter", "Frame Request Pending", frame_number_++);
- Show in Timeline:
- set FLAG_systrace_timeline = true, then change timeline recorder to TimelineEventSystraceRecorder on Android
Don't have any async events in systrace:
- With this PR, we can see async events, such as Frame Request Pending:
// in Android Platform, path: android/system/core/libcutils/trace-dev.c
void atrace_async_begin_body(const char* name, int32_t cookie)
{
char buf[ATRACE_MESSAGE_LENGTH];
size_t len;
len = snprintf(buf, ATRACE_MESSAGE_LENGTH, "S|%d|%s|%" PRId32,
getpid(), name, cookie);
write(atrace_marker_fd, buf, len);
}
void atrace_async_end_body(const char* name, int32_t cookie)
{
char buf[ATRACE_MESSAGE_LENGTH];
size_t len;
len = snprintf(buf, ATRACE_MESSAGE_LENGTH, "F|%d|%s|%" PRId32,
getpid(), name, cookie);
write(atrace_marker_fd, buf, len);
}
support TimelineEvent kAsyncBegin and kAsyncEnd with S/F.