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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2011-02-16 11:22:34 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-02-16 13:30:55 +0100 |
| commit | 163ec4354a5135c6c38c3f4a9b46a31900ebdf48 (patch) | |
| tree | 59063e726453ace397c66d95cab09ac43265be41 /include/linux/perf_event.h | |
| parent | 4979d2729af22f6ce8faa325fc60a85a2c2daa02 (diff) | |
| download | lwn-163ec4354a5135c6c38c3f4a9b46a31900ebdf48.tar.gz lwn-163ec4354a5135c6c38c3f4a9b46a31900ebdf48.zip | |
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.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 38c8b2554842..8ceb5a6fd9c9 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; |