From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756195AbcETQkU (ORCPT ); Fri, 20 May 2016 12:40:20 -0400 Received: from szxga01-in.huawei.com ([58.251.152.64]:18074 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756135AbcETQkP (ORCPT ); Fri, 20 May 2016 12:40:15 -0400 From: Wang Nan To: CC: , , Wang Nan , Arnaldo Carvalho de Melo , He Kuang , Jiri Olsa , Masami Hiramatsu , Namhyung Kim , "Peter Zijlstra" , Zefan Li Subject: [PATCH v2 00/13] perf tools: Support overwritable ring buffer Date: Fri, 20 May 2016 16:38:22 +0000 Message-ID: <1463762315-155689-1-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=0001.0A020201.573F3D9A.0270,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: c0384e36333b2a3fd4050468472f96e3 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. Wang Nan (13): perf tools: Add overwrite attribute to evsel and check write_backward perf tools: Record fd into perf_mmap perf tools: Add API to pause a evlist perf record: Prevent reading invalid data in record__mmap_read perf record: Rename variable to make code clear perf record: Read from backward ring buffer perf evlist: Introduce aux perf evlist perf tools: Don't poll and mmap overwritable events perf tools: Enable overwrite settings perf record: Introduce rec->overwrite_evlist for overwritable events perf record: Toggle overwrite ring buffer for reading perf tools: Don't warn about out of order event if write_backward is used perf tools: Check write_backward during evlist config tools/perf/Documentation/perf-record.txt | 14 ++ tools/perf/arch/x86/util/tsc.c | 2 + tools/perf/builtin-record.c | 344 +++++++++++++++++++++++++++---- tools/perf/perf.h | 1 + tools/perf/util/evlist.c | 81 ++++++-- tools/perf/util/evlist.h | 6 + tools/perf/util/evsel.c | 38 +++- tools/perf/util/evsel.h | 16 ++ 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 +- 13 files changed, 497 insertions(+), 68 deletions(-) Cc: Arnaldo Carvalho de Melo Cc: He Kuang Cc: Jiri Olsa Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Wang Nan Cc: Zefan Li Cc: pi3orama@163.com -- 1.8.3.4