From patchwork Mon May 23 07:13:47 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wang Nan X-Patchwork-Id: 68331 Delivered-To: patch@linaro.org Received: by 10.140.92.199 with SMTP id b65csp1073438qge; Mon, 23 May 2016 00:16:24 -0700 (PDT) X-Received: by 10.98.22.129 with SMTP id 123mr25306801pfw.74.1463987784015; Mon, 23 May 2016 00:16:24 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id m124si49750158pfm.35.2016.05.23.00.16.23; Mon, 23 May 2016 00:16:24 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753409AbcEWHQL (ORCPT + 30 others); Mon, 23 May 2016 03:16:11 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:38683 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753251AbcEWHOz (ORCPT ); Mon, 23 May 2016 03:14:55 -0400 Received: from 172.24.1.137 (EHLO szxeml432-hub.china.huawei.com) ([172.24.1.137]) by szxrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DHM41885; Mon, 23 May 2016 15:14:11 +0800 (CST) Received: from linux-4hy3.site (10.107.193.248) by szxeml432-hub.china.huawei.com (10.82.67.209) with Microsoft SMTP Server id 14.3.235.1; Mon, 23 May 2016 15:14:00 +0800 From: Wang Nan To: CC: , , Wang Nan , He Kuang , "Arnaldo Carvalho de Melo" , Jiri Olsa , Masami Hiramatsu , Namhyung Kim , "Zefan Li" Subject: [PATCH v3 10/11] perf tools: Don't warn about out of order event if write_backward is used Date: Mon, 23 May 2016 07:13:47 +0000 Message-ID: <1463987628-163563-11-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1463987628-163563-1-git-send-email-wangnan0@huawei.com> References: <1463987628-163563-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090202.5742ADC5.007C, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: b2bb8b434863da127dddeb39011891db Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If write_backward attribute is set, records are written into kernel ring buffer from end to beginning, but read from beginning to end. To avoid 'XX out of order events recorded' warning message (timestamps of records is in reverse order when using write_backward), suppress the warning message if write_backward is selected by at lease one event. Result: Before this patch: # perf record -m 1 -e raw_syscalls:sys_exit/overwrite/ \ -e raw_syscalls:sys_enter \ dd if=/dev/zero of=/dev/null count=300 300+0 records in 300+0 records out 153600 bytes (154 kB) copied, 0.000601617 s, 255 MB/s [ perf record: Woken up 5 times to write data ] Warning: 40 out of order events recorded. [ perf record: Captured and wrote 0.096 MB perf.data (696 samples) ] After this patch: # perf record -m 1 -e raw_syscalls:sys_exit/overwrite/ \ -e raw_syscalls:sys_enter \ dd if=/dev/zero of=/dev/null count=300 300+0 records in 300+0 records out 153600 bytes (154 kB) copied, 0.000644873 s, 238 MB/s [ perf record: Woken up 5 times to write data ] [ perf record: Captured and wrote 0.096 MB perf.data (696 samples) ] Signed-off-by: Wang Nan Signed-off-by: He Kuang Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Zefan Li Cc: pi3orama@163.com --- tools/perf/util/session.c | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-) -- 1.8.3.4 diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 2335b28..8e3d9d4 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -1495,10 +1495,27 @@ int perf_session__register_idle_thread(struct perf_session *session) return err; } +static void +perf_session__warn_order(const struct perf_session *session) +{ + const struct ordered_events *oe = &session->ordered_events; + struct perf_evsel *evsel; + bool should_warn = true; + + evlist__for_each(session->evlist, evsel) { + if (evsel->attr.write_backward) + should_warn = false; + } + + if (!should_warn) + return; + if (oe->nr_unordered_events != 0) + ui__warning("%u out of order events recorded.\n", oe->nr_unordered_events); +} + static void perf_session__warn_about_errors(const struct perf_session *session) { const struct events_stats *stats = &session->evlist->stats; - const struct ordered_events *oe = &session->ordered_events; if (session->tool->lost == perf_event__process_lost && stats->nr_events[PERF_RECORD_LOST] != 0) { @@ -1555,8 +1572,7 @@ static void perf_session__warn_about_errors(const struct perf_session *session) stats->nr_unprocessable_samples); } - if (oe->nr_unordered_events != 0) - ui__warning("%u out of order events recorded.\n", oe->nr_unordered_events); + perf_session__warn_order(session); events_stats__auxtrace_error_warn(stats);