From: Wang Nan <wangnan0@huawei.com>
To: <acme@kernel.org>
Cc: <pi3orama@163.com>, <linux-kernel@vger.kernel.org>,
Wang Nan <wangnan0@huawei.com>
Subject: [PATCH v6 00/10] perf tools: Support overwritable ring buffer
Date: Wed, 25 May 2016 13:44:48 +0000 [thread overview]
Message-ID: <1464183898-174512-1-git-send-email-wangnan0@huawei.com> (raw)
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
next reply other threads:[~2016-05-25 13:45 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-25 13:44 Wang Nan [this message]
2016-05-25 13:44 ` [PATCH v6 01/10] perf tools: Check 'base' pointer before checking refcnt when put a mmap Wang Nan
2016-06-02 6:32 ` [tip:perf/core] perf evlist: " tip-bot for Wang Nan
2016-05-25 13:44 ` [PATCH v6 02/10] perf tools: Choose correct reading direction according to evlist->backward Wang Nan
2016-06-02 6:33 ` [tip:perf/core] perf evlist: " tip-bot for Wang Nan
2016-05-25 13:44 ` [PATCH v6 03/10] perf tests: Add testcase for auxiliary evlist Wang Nan
2016-05-25 13:44 ` [PATCH v6 04/10] perf record: Introduce rec->overwrite_evlist for overwritable events Wang Nan
2016-05-25 13:44 ` [PATCH v6 05/10] perf record: Toggle overwrite ring buffer for reading Wang Nan
2016-05-25 13:44 ` [PATCH v6 06/10] perf tools: Enable overwrite settings Wang Nan
2016-05-25 13:44 ` [PATCH v6 07/10] perf tools: Don't warn about out of order event if write_backward is used Wang Nan
2016-05-25 13:44 ` [PATCH v6 08/10] perf tools: Check write_backward during evlist config Wang Nan
2016-05-25 13:44 ` [PATCH v6 09/10] tools: Pass arg to fdarray__filter's call back function Wang Nan
2016-06-02 6:33 ` [tip:perf/core] " tip-bot for Wang Nan
2016-05-25 13:44 ` [PATCH v6 10/10] perf record: Unmap overwrite evlist when event terminate Wang Nan
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