Messages in this thread Patch in this message | | | Date | Fri, 15 Mar 2013 15:39:54 -0400 | From | Steven Rostedt <> | Subject | [for-next][PATCH 19/20] tracing: Add "perf" trace_clock |
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From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>
The function trace_clock() calls "local_clock()" which is exactly the same clock that perf uses. I'm not sure why perf doesn't call trace_clock(), as trace_clock() doesn't have any users.
But now it does. As trace_clock() calls local_clock() like perf does, I added the trace_clock "perf" option that uses trace_clock().
Now the ftrace buffers can use the same clock as perf uses. This will be useful when perf starts reading the ftrace buffers, and will be able to interleave them with the same clock data.
Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> --- kernel/trace/trace.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 8eabfbb..7f0e7fa 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -648,6 +648,7 @@ static struct { { trace_clock_global, "global", 1 }, { trace_clock_counter, "counter", 0 }, { trace_clock_jiffies, "uptime", 1 }, + { trace_clock, "perf", 1 }, ARCH_TRACE_CLOCKS }; -- 1.7.10.4
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