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perf: export perf_event_refresh() to modules

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KVM needs one-shot samples, since a PMC programmed to -X will fire after X
events and then again after 2^40 events (i.e. variable period).

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1309362157-6596-4-git-send-email-avi@redhat.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Avi Kivity 2011-06-29 18:42:37 +03:00 committed by Ingo Molnar
parent 0af3ac1fdb
commit 26ca5c11fb
2 changed files with 7 additions and 1 deletions
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5
include/linux/perf_event.h
View File

@ -955,6 +955,7 @@ extern void perf_pmu_disable(struct pmu *pmu);
extern void perf_pmu_enable(struct pmu *pmu);
extern int perf_event_task_disable(void);
extern int perf_event_task_enable(void);
extern int perf_event_refresh(struct perf_event *event, int refresh);
extern void perf_event_update_userpage(struct perf_event *event);
extern int perf_event_release_kernel(struct perf_event *event);
extern struct perf_event *
@ -1149,6 +1150,10 @@ static inline void perf_event_delayed_put(struct task_struct *task) { }
static inline void perf_event_print_debug(void) { }
static inline int perf_event_task_disable(void) { return -EINVAL; }
static inline int perf_event_task_enable(void) { return -EINVAL; }
static inline int perf_event_refresh(struct perf_event *event, int refresh)
{
return -EINVAL;
}
static inline void
perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) { }

3
kernel/events/core.c
View File

@ -1764,7 +1764,7 @@ out:
raw_spin_unlock_irq(&ctx->lock);
}
static int perf_event_refresh(struct perf_event *event, int refresh)
int perf_event_refresh(struct perf_event *event, int refresh)
{
/*
* not supported on inherited events
@ -1777,6 +1777,7 @@ static int perf_event_refresh(struct perf_event *event, int refresh)
return 0;
}
EXPORT_SYMBOL_GPL(perf_event_refresh);
static void ctx_sched_out(struct perf_event_context *ctx,
struct perf_cpu_context *cpuctx,