linux-kernel - [PATCH v1 3/5] perf: export perf_event

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Date:	Wed, 11 May 2011 11:55:31 -0400
From:	Avi Kivity <avi@...hat.com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: [PATCH v1 3/5] 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: Avi Kivity <avi@...hat.com>
---
 include/linux/perf_event.h |    5 +++++
 kernel/events/core.c       |    3 ++-
 2 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index de346a0..b317a8b 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -975,6 +975,7 @@ 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 *
@@ -1170,6 +1171,10 @@ 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, int nmi,
diff --git a/kernel/events/core.c b/kernel/events/core.c
index f60b81c..6f58291 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -1747,7 +1747,7 @@ 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
@@ -1760,6 +1760,7 @@ 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,
-- 
1.7.4.3

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