From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756028AbZKTV2e (ORCPT ); Fri, 20 Nov 2009 16:28:34 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755067AbZKTV2b (ORCPT ); Fri, 20 Nov 2009 16:28:31 -0500 Received: from casper.infradead.org ([85.118.1.10]:48330 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755258AbZKTV21 (ORCPT ); Fri, 20 Nov 2009 16:28:27 -0500 Message-Id: <20091120212508.222339539@chello.nl> References: <20091120211942.676891948@chello.nl> User-Agent: quilt/0.46-1 Date: Fri, 20 Nov 2009 22:19:43 +0100 From: Peter Zijlstra To: Paul Mackerras , Ingo Molnar , Peter Zijlstra Cc: linux-kernel@vger.kernel.org Subject: [PATCH 01/15] perf: allow for custom overflow handlers Content-Disposition: inline; filename=perf-overflow.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org in-kernel perf users might wish to have custom actions on the sample interrupt. Signed-off-by: Peter Zijlstra --- 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: */ --