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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2011-02-16 11:22:34 +0100
committerIngo Molnar <mingo@elte.hu>2011-02-16 13:30:55 +0100
commit163ec4354a5135c6c38c3f4a9b46a31900ebdf48 (patch)
tree59063e726453ace397c66d95cab09ac43265be41 /include/linux/perf_event.h
parent4979d2729af22f6ce8faa325fc60a85a2c2daa02 (diff)
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perf: Optimize throttling code
By pre-computing the maximum number of samples per tick we can avoid a multiplication and a conditional since MAX_INTERRUPTS > max_samples_per_tick. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/perf_event.h')
-rw-r--r--include/linux/perf_event.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 38c8b25..8ceb5a6 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1110,6 +1110,10 @@ extern int sysctl_perf_event_paranoid;
extern int sysctl_perf_event_mlock;
extern int sysctl_perf_event_sample_rate;
+extern int perf_proc_update_handler(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos);
+
static inline bool perf_paranoid_tracepoint_raw(void)
{
return sysctl_perf_event_paranoid > -1;
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