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perf: Optimize throttling code

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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>
This commit is contained in:
Peter Zijlstra
2011-02-16 11:22:34 +01:00
committed by Ingo Molnar
parent 4979d2729a
commit 163ec4354a
3 changed files with 29 additions and 20 deletions
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2
kernel/sysctl.c
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@@ -948,7 +948,7 @@ static struct ctl_table kern_table[] = {
.data = &sysctl_perf_event_sample_rate,
.maxlen = sizeof(sysctl_perf_event_sample_rate),
.mode = 0644,
.proc_handler = proc_dointvec,
.proc_handler = perf_proc_update_handler,
},
#endif
#ifdef CONFIG_KMEMCHECK