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Change path order when trying to open tracing
/sys/kernel/debug/tracing is the old path[1] and only present for backwards compatibility. Check the new path first otherwise accessing /sys/kernel/debug/tracing will cause debugfs to be mounted. If permissions are not set correctly after the mount, the user process may not have a way to access the trace_marker. [1] https://www.kernel.org/doc/Documentation/trace/ftrace.txt Bug: None Change-Id: Ifbd967c0f7298c8877c23bd4908d172b94f9e2d2 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/96832 Reviewed-by: Ryan Macnak <rmacnak@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>
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@ -28,9 +28,9 @@ static int OpenTraceFD() {
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const char* kSystraceDebugPath = "/sys/kernel/debug/tracing/trace_marker";
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const char* kSystracePath = "/sys/kernel/tracing/trace_marker";
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int fd = TEMP_FAILURE_RETRY(::open(kSystraceDebugPath, O_WRONLY));
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int fd = TEMP_FAILURE_RETRY(::open(kSystracePath, O_WRONLY));
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if (fd < 0) {
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fd = TEMP_FAILURE_RETRY(::open(kSystracePath, O_WRONLY));
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fd = TEMP_FAILURE_RETRY(::open(kSystraceDebugPath, O_WRONLY));
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}
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if (fd < 0 && FLAG_trace_timeline) {
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