[PATCH 10/10] perf: Optimize perf_tp_event_match

[Peter Zijlstra]

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@xxxxxxxxx>
---
 kernel/perf_event.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Index: linux-2.6/kernel/perf_event.c
===================================================================
--- linux-2.6.orig/kernel/perf_event.c
+++ linux-2.6/kernel/perf_event.c
@@ -4477,7 +4477,10 @@ static int perf_tp_event_match(struct pe
 				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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