Messages in this thread Patch in this message | | | Date | Sat, 21 Nov 2009 13:41:01 GMT | From | tip-bot for Peter Zijlstra <> | Subject | [tip:perf/core] perf: Allow for custom overflow handlers |
| |
Commit-ID: 453f19eea7dbad837425e9b07d84568d14898794 Gitweb: http://git.kernel.org/tip/453f19eea7dbad837425e9b07d84568d14898794 Author: Peter Zijlstra <a.p.zijlstra@chello.nl> AuthorDate: Fri, 20 Nov 2009 22:19:43 +0100 Committer: Ingo Molnar <mingo@elte.hu> 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@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <20091120212508.222339539@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu> --- 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: */
| |