Commit 580d607c authored May 20, 2010 by Peter Zijlstra Committed by Ingo Molnar May 21, 2010

perf: Optimize perf_tp_event_match()



Since we know tracepoints come from kernel context,
avoid conditionals that try and establish that very
fact.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <20100521090710.904944001@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent a94ffaaf

kernel/perf_event.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -4496,7 +4496,10 @@ static int perf_tp_event_match(struct perf_event *event,
		struct perf_sample_data *data,
		struct pt_regs *regs)
		{
		if (perf_exclude_event(event, regs))
		/*
		* All tracepoints are from kernel-space.
		*/
		if (event->attr.exclude_kernel)
		return 0;

		if (!perf_tp_filter_match(event, data))