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perf: Allow for custom overflow handlers

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

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20091120212508.222339539@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-11-20 22:19:43 +01:00 committed by Ingo Molnar
parent ef6ae72425
commit 453f19eea7
2 changed files with 13 additions and 1 deletions
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6
include/linux/perf_event.h
View File

@ -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

8
kernel/perf_event.c
View File

@ -3710,7 +3710,11 @@ static int __perf_event_overflow(struct perf_event *event, int nmi,
perf_event_disable(event);
}
perf_event_output(event, nmi, data, regs);
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:
*/