From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757476AbZDBMGH (ORCPT ); Thu, 2 Apr 2009 08:06:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756657AbZDBMFP (ORCPT ); Thu, 2 Apr 2009 08:05:15 -0400 Received: from hera.kernel.org ([140.211.167.34]:42375 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756627AbZDBMFN (ORCPT ); Thu, 2 Apr 2009 08:05:13 -0400 Date: Thu, 2 Apr 2009 12:03:47 GMT From: Peter Zijlstra To: linux-tip-commits@vger.kernel.org Cc: linux-kernel@vger.kernel.org, paulus@samba.org, hpa@zytor.com, mingo@redhat.com, a.p.zijlstra@chello.nl, tglx@linutronix.de, cjashfor@linux.vnet.ibm.com, mingo@elte.hu Reply-To: mingo@redhat.com, hpa@zytor.com, paulus@samba.org, linux-kernel@vger.kernel.org, a.p.zijlstra@chello.nl, tglx@linutronix.de, cjashfor@linux.vnet.ibm.com, mingo@elte.hu In-Reply-To: <20090402091319.323309784@chello.nl> References: <20090402091319.323309784@chello.nl> Subject: [tip:perfcounters/core] perf_counter: per event wakeups Message-ID: Git-Commit-ID: b202978dae5fce00d19480360f165a181be19704 X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.0 (hera.kernel.org [127.0.0.1]); Thu, 02 Apr 2009 12:03:49 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: b202978dae5fce00d19480360f165a181be19704 Gitweb: http://git.kernel.org/tip/b202978dae5fce00d19480360f165a181be19704 Author: Peter Zijlstra AuthorDate: Thu, 2 Apr 2009 11:12:01 +0200 Committer: Ingo Molnar CommitDate: Thu, 2 Apr 2009 13:52:59 +0200 perf_counter: per event wakeups By request, provide a way to request a wakeup every 'n' events instead of every page of output. Signed-off-by: Peter Zijlstra Cc: Paul Mackerras Cc: Corey Ashford LKML-Reference: <20090402091319.323309784@chello.nl> Signed-off-by: Ingo Molnar --- include/linux/perf_counter.h | 3 ++- kernel/perf_counter.c | 10 +++++++++- 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h index 06a6fba..5428ba1 100644 --- a/include/linux/perf_counter.h +++ b/include/linux/perf_counter.h @@ -145,7 +145,7 @@ struct perf_counter_hw_event { __reserved_1 : 53; __u32 extra_config_len; - __u32 __reserved_4; + __u32 wakeup_events; /* wakeup every n events */ __u64 __reserved_2; __u64 __reserved_3; @@ -321,6 +321,7 @@ struct perf_mmap_data { int nr_pages; atomic_t wakeup; atomic_t head; + atomic_t events; struct perf_counter_mmap_page *user_page; void *data_pages[0]; }; diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index 995063d..9bcab10 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -1760,7 +1760,15 @@ static void perf_output_copy(struct perf_output_handle *handle, static void perf_output_end(struct perf_output_handle *handle) { - if (handle->wakeup) + int wakeup_events = handle->counter->hw_event.wakeup_events; + + if (wakeup_events) { + int events = atomic_inc_return(&handle->data->events); + if (events >= wakeup_events) { + atomic_sub(wakeup_events, &handle->data->events); + __perf_output_wakeup(handle); + } + } else if (handle->wakeup) __perf_output_wakeup(handle); rcu_read_unlock(); }