Messages in this thread Patch in this message | | | Date | Fri, 21 May 2010 11:30:33 GMT | From | tip-bot for Peter Zijlstra <> | Subject | [tip:perf/core] perf: Optimize perf_tp_event_match() |
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Commit-ID: 580d607cd666dfabfc1c7b0fb08c8ac690c7c87f Gitweb: http://git.kernel.org/tip/580d607cd666dfabfc1c7b0fb08c8ac690c7c87f Author: Peter Zijlstra <a.p.zijlstra@chello.nl> AuthorDate: Thu, 20 May 2010 20:54:31 +0200 Committer: Ingo Molnar <mingo@elte.hu> CommitDate: Fri, 21 May 2010 11:38:00 +0200
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> --- 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 d25c864..e099650 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))
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