Commit 26ca5c11 authored by Avi Kivity's avatar Avi Kivity Committed by Ingo Molnar
Browse files

perf: export perf_event_refresh() to modules 



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: default avatarAvi Kivity <avi@redhat.com>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1309362157-6596-4-git-send-email-avi@redhat.com


Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 0af3ac1f

include/linux/perf_event.h

+5 −0
Original line number Diff line number Diff line
@@ -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)	{ }

kernel/events/core.c

+2 −1
Original line number Diff line number Diff line
@@ -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,

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