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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-05-20 20:54:31 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-05-21 11:38:00 +0200 |
| commit | 580d607cd666dfabfc1c7b0fb08c8ac690c7c87f (patch) | |
| tree | 6d7c87d60b12adbacd4dbcb8c784975bc1203228 /kernel/perf_event.c | |
| parent | a94ffaaf55552769af328eaca9260fe6291c66c7 (diff) | |
| download | lwn-580d607cd666dfabfc1c7b0fb08c8ac690c7c87f.tar.gz lwn-580d607cd666dfabfc1c7b0fb08c8ac690c7c87f.zip | |
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>
Diffstat (limited to 'kernel/perf_event.c')
| -rw-r--r-- | kernel/perf_event.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index d25c864cadbf..e099650cd249 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -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)) |