Path: csiph.com!goblin2!goblin.stu.neva.ru!gothmog.csi.it!bofh.it!news.nic.it!robomod From: Wang Nan Newsgroups: linux.kernel Subject: [PATCH v12 0/8] perf tools: Support overwritable ring buffer Date: Fri, 01 Jul 2016 04:30:01 +0200 Message-ID: X-Original-To: , 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=0001.0A020203.5775D446.00F9,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: b246dc17995b98adeff1a337cf12ef58 Sender: robomod@news.nic.it List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Approved: robomod@news.nic.it Lines: 83 Organization: linux.* mail to news gateway X-Original-Cc: , , , Wang Nan X-Original-Date: Fri, 1 Jul 2016 02:23:43 +0000 X-Original-Message-ID: <1467339831-171169-1-git-send-email-wangnan0@huawei.com> X-Original-Sender: linux-kernel-owner@vger.kernel.org Xref: csiph.com linux.kernel:1434968 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. v6 -> v7: Rebase to newest perf/core. v7 -> v8: Unmap mmaps from parent and children in perf_evlist__munmap_filtered(), hide more detail of aux evlist. Add --tail-synthesize, do synthesize at the end of perf.data. v8 -> v9: Beautify code of test case, make patch set more granular, improve documentation. v9 -> v10: Make patch set more granular: extract preparation code to patch 1-3. v10 -> v11: Rebase to newest perf/core: solve conflicts caused by commit e5cadb93d08 ("perf evlist: Rename for_each() macros to for_each_entry()"). v11 -> v12: Improve 'perf test backward': skip this test on old kernel, resolve conflicts. Arnaldo Carvalho de Melo (1): perf tests: Skip backward ring buffer on old kernel Wang Nan (7): perf evlist: Introduce aux evlist perf tests: Add testcase for auxiliary evlist perf record: Introduce rec->overwrite_evlist for overwritable events perf record: Read from overwritable ring buffer perf tools: Enable overwrite settings perf tools: Don't warn about out of order event if write_backward is used perf tools: Add --tail-synthesize option tools/perf/Documentation/perf-record.txt | 22 +++ tools/perf/builtin-record.c | 228 +++++++++++++++++++++++++++++-- tools/perf/perf.h | 2 + tools/perf/tests/backward-ring-buffer.c | 89 +++++++++--- tools/perf/util/evlist.c | 49 +++++-- tools/perf/util/evlist.h | 20 +++ tools/perf/util/evsel.c | 12 ++ tools/perf/util/evsel.h | 2 + tools/perf/util/parse-events.c | 20 ++- tools/perf/util/parse-events.h | 2 + tools/perf/util/parse-events.l | 2 + tools/perf/util/session.c | 22 ++- 12 files changed, 426 insertions(+), 44 deletions(-) -- 1.8.3.4