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Commit 453f19ee authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

perf: Allow for custom overflow handlers 



in-kernel perf users might wish to have custom actions on the
sample interrupt.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20091120212508.222339539@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent ef6ae724

include/linux/perf_event.h

+6 −0
Original line number Diff line number Diff line
@@ -567,6 +567,8 @@ struct perf_pending_entry { 


typedef void (*perf_callback_t)(struct perf_event *, void *);



struct perf_sample_data;



/**

 * struct perf_event - performance event kernel representation:

 */
@@ -658,6 +660,10 @@ struct perf_event { 
	struct pid_namespace		*ns;

	u64				id;



	void (*overflow_handler)(struct perf_event *event,

			int nmi, struct perf_sample_data *data,

			struct pt_regs *regs);



#ifdef CONFIG_EVENT_PROFILE

	struct event_filter		*filter;

#endif

kernel/perf_event.c

+7 −1
Original line number Diff line number Diff line
@@ -3710,7 +3710,11 @@ static int __perf_event_overflow(struct perf_event *event, int nmi, 
			perf_event_disable(event);

	}



	if (event->overflow_handler)

		event->overflow_handler(event, nmi, data, regs);

	else

		perf_event_output(event, nmi, data, regs);



	return ret;

}
@@ -4836,6 +4840,8 @@ inherit_event(struct perf_event *parent_event, 
	if (parent_event->attr.freq)

		child_event->hw.sample_period = parent_event->hw.sample_period;



	child_event->overflow_handler = parent_event->overflow_handler;



	/*

	 * Link it up in the child's context:

	 */