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perf: Add helper function to return number of counters

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The number of counters for the registered pmu is needed in a few places
so provide a helper function that returns this number.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
Tested-by: Will Deacon <will.deacon@arm.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Robert Richter <robert.richter@amd.com>
This commit is contained in:
Matt Fleming
2010-09-27 20:22:24 +01:00
committed by Robert Richter
parent 4cbe75be5c
commit 3bf101ba42
4 changed files with 34 additions and 13 deletions
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include/linux/perf_event.h
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@@ -849,6 +849,7 @@ extern int perf_max_events;
extern const struct pmu *hw_perf_event_init(struct perf_event *event);
extern int perf_num_counters(void);
extern void perf_event_task_sched_in(struct task_struct *task);
extern void perf_event_task_sched_out(struct task_struct *task, struct task_struct *next);
extern void perf_event_task_tick(struct task_struct *task);