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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>
hifive-unleashed-5.1
Peter Zijlstra 2010-05-20 20:54:31 +02:00 committed by Ingo Molnar
parent a94ffaaf55
commit 580d607cd6
1 changed files with 4 additions and 1 deletions
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5
kernel/perf_event.c
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@ -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))