From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752796AbcEYNpa (ORCPT ); Wed, 25 May 2016 09:45:30 -0400 Received: from szxga03-in.huawei.com ([119.145.14.66]:35397 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752518AbcEYNp2 (ORCPT ); Wed, 25 May 2016 09:45:28 -0400 From: Wang Nan To: CC: , , Wang Nan Subject: [PATCH v6 00/10] perf tools: Support overwritable ring buffer Date: Wed, 25 May 2016 13:44:48 +0000 Message-ID: <1464183898-174512-1-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020206.5745AC66.004F,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-05-26 15:14:31, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 9f50878d6b314548a3786c2dafa1effd Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch set enables daemonized perf recording by utilizing overwritable backward ring buffer. With this feature one can put perf background, and dump ring buffer records by a SIGUSR2 when he/she find something unusual. For example, following command record system calls, schedule events and samples on cpu cycles continously: # perf record -g -e cycles -e raw_syscalls:*/call-graph=no/ \ -e sched:sched_switch/call-graph=no/ \ --switch-output --overwrite -a Then by sending SIGUSR2 to perf when lagging is happen, we get multiple perf.data output, each of them correspond a abnormal event, and the data size is reasonable: # ls -l ./perf.data* -rw------- 1 root root 5122165 May 13 23:51 ./perf.data.2016051323511683 -rw------- 1 root root 5135093 May 13 23:51 ./perf.data.2016051323512107 -rw------- 1 root root 5135213 May 13 23:51 ./perf.data.2016051323512215 -rw------- 1 root root 5135157 May 13 23:51 ./perf.data.2016051323512387 v1 -> v2: Totally redesign: drop the principle of 'channal', use auxiliary evlist instead. Fix missing documentation. v2 -> v3: Rename perf_evlist__toggle_paused() to perf_evlist__pause/resume. v3 -> v4: Update commit message to describe auxiliary evlist more clearly. v4 -> v5: Reorder commits, ensure '--overwrite' works right after perf support the option. Add test cases for auxiliary evlist. Avoid bug if main evlist is empty. v5 -> v6: Improve filter pollfd related code. Wang Nan (10): perf tools: Check 'base' pointer before checking refcnt when put a mmap perf tools: Choose correct reading direction according to evlist->backward perf tests: Add testcase for auxiliary evlist perf record: Introduce rec->overwrite_evlist for overwritable events perf record: Toggle overwrite ring buffer for reading perf tools: Enable overwrite settings perf tools: Don't warn about out of order event if write_backward is used perf tools: Check write_backward during evlist config tools: Pass arg to fdarray__filter's call back function perf record: Unmap overwrite evlist when event terminate tools/lib/api/fd/array.c | 5 +- tools/lib/api/fd/array.h | 3 +- tools/perf/Documentation/perf-record.txt | 14 ++ tools/perf/builtin-record.c | 301 +++++++++++++++++++++++++++---- tools/perf/perf.h | 1 + tools/perf/tests/backward-ring-buffer.c | 86 +++++++-- tools/perf/tests/fdarray.c | 8 +- tools/perf/util/evlist.c | 23 ++- tools/perf/util/evlist.h | 4 +- tools/perf/util/evsel.c | 27 +-- tools/perf/util/evsel.h | 15 ++ tools/perf/util/parse-events.c | 20 +- tools/perf/util/parse-events.h | 2 + tools/perf/util/parse-events.l | 2 + tools/perf/util/record.c | 17 ++ tools/perf/util/session.c | 22 ++- 16 files changed, 465 insertions(+), 85 deletions(-) -- 1.8.3.4