Commit-ID: 453f19eea7dbad837425e9b07d84568d14898794
Gitweb: http://git.kernel.org/tip/453f19eea7dbad837425e9b07d84568d14898794
Author: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
AuthorDate: Fri, 20 Nov 2009 22:19:43 +0100
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Sat, 21 Nov 2009 14:11:35 +0100
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@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
LKML-Reference: <20091120212508.222339539@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
include/linux/perf_event.h | 6 ++++++
kernel/perf_event.c | 8 +++++++-
2 files changed, 13 insertions(+), 1 deletions(-)
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index b5cdac0..a430ac3 100644
--- a/include/linux/perf_event.h
+++ b/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
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 3852e26..1dfb6cc 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -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:
*/
--
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