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Subject[PATCH 01/15] perf: allow for custom overflow handlers
in-kernel perf users might wish to have custom actions on the sample
interrupt.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
include/linux/perf_event.h | 6 ++++++
kernel/perf_event.c | 8 +++++++-
2 files changed, 13 insertions(+), 1 deletion(-)

Index: linux-2.6/include/linux/perf_event.h
===================================================================
--- linux-2.6.orig/include/linux/perf_event.h
+++ linux-2.6/include/linux/perf_event.h
@@ -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
Index: linux-2.6/kernel/perf_event.c
===================================================================
--- linux-2.6.orig/kernel/perf_event.c
+++ linux-2.6/kernel/perf_event.c
@@ -3710,7 +3710,11 @@ static int __perf_event_overflow(struct
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_
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:
*/
--



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