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perf counters: add prctl interface to disable/enable counters

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Add a way for self-monitoring tasks to disable/enable counters summarily,
via a prctl:

	PR_TASK_PERF_COUNTERS_DISABLE		31
	PR_TASK_PERF_COUNTERS_ENABLE		32

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
2008-12-11 14:59:31 +01:00
parent bae43c9945
commit 1d1c7ddbfa
4 changed files with 93 additions and 7 deletions
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4
include/linux/perf_counter.h
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@ -213,6 +213,8 @@ extern u64 hw_perf_save_disable(void);
extern void hw_perf_restore(u64 ctrl);
extern void atomic64_counter_set(struct perf_counter *counter, u64 val64);
extern u64 atomic64_counter_read(struct perf_counter *counter);
extern int perf_counter_task_disable(void);
extern int perf_counter_task_enable(void);
#else
static inline void
@ -226,6 +228,8 @@ static inline void perf_counter_notify(struct pt_regs *regs) { }
static inline void perf_counter_print_debug(void) { }
static inline void hw_perf_restore(u64 ctrl) { }
static inline u64 hw_perf_save_disable(void) { return 0; }
static inline int perf_counter_task_disable(void) { return -EINVAL; }
static inline int perf_counter_task_enable(void) { return -EINVAL; }
#endif
#endif /* _LINUX_PERF_COUNTER_H */