linux-kernel - [PATCH 00/10] perf tools: Use SIGUSR2 control data dumpping

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Date:	Wed, 13 Apr 2016 08:21:03 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<acme@...nel.org>
CC:	<linux-kernel@...r.kernel.org>, <pi3orama@....com>,
	Wang Nan <wangnan0@...wei.com>, He Kuang <hekuang@...wei.com>,
	"Arnaldo Carvalho de Melo" <acme@...hat.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 00/10] perf tools: Use SIGUSR2 control data dumpping

This patch set is a preparation to support overwritable ring buffer.
However, even without the kernel side core patch [1] is accept this
patch set is still useful.

With this patch set, perf switches output when receiving SIGUSR2. For
example:

 # perf record -a -F99 --switch-output &
 [1] 26435
 # kill -s SIGUSR2 26435
 [ perf record: dump data: Woken up 1 times ]
 # [ perf record: Dump perf.data.2016041323544373 ]
 # kill -s SIGUSR2 26435
 [ perf record: dump data: Woken up 1 times ]
 # [ perf record: Dump perf.data.2016041323544730 ]
 # fg
 perf record -a -F99 --switch-output
 ^C[ perf record: Woken up 1 times to write data ]
 [ perf record: Dump perf.data.2016041323545019 ]
 [ perf record: Captured and wrote 0.395 MB perf.data.<timestamp> ]

User can periodically generates perf trace with a simple script, then
remove most of them, only keeps scripts collected when something
unusual is detected.

After [1], perf can be totally silent before receiving SIGUSR2. Trace
is collected in kernel overwritable ring buffer, and dumpped when
SIGUSR2 is received.

[1] http://lkml.kernel.org/r/1459865478-53413-1-git-send-email-wangnan0@huawei.com

Cc: Wang Nan <wangnan0@...wei.com>
Cc: He Kuang <hekuang@...wei.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com

Wang Nan (10):
  perf tools: Make ordered_events reusable
  perf tools: Add perf_data_file__switch() helper
  perf record: Turns auxtrace_snapshot_enable into 3 states
  perf record: Add '--timestamp-filename' option to append timestamp to
    output filename
  perf record: Split output into multiple files via '--switch-output'
  perf record: Force enable --timestamp-filename when --switch-output is
    provided
  perf record: Disable buildid cache options by default in switch output
    mode
  perf record: Re-synthesize tracking events after output switching
  perf record: Generate tracking events for process forked by perf
  perf core: Add backward attribute to perf event

 include/linux/perf_event.h       |  28 +++++-
 include/uapi/linux/perf_event.h  |   3 +-
 kernel/events/core.c             |  48 ++++++++-
 kernel/events/ring_buffer.c      |  16 ++-
 tools/perf/builtin-record.c      | 208 +++++++++++++++++++++++++++++++++++----
 tools/perf/util/data.c           |  41 ++++++++
 tools/perf/util/data.h           |  11 ++-
 tools/perf/util/ordered-events.c |   9 ++
 tools/perf/util/ordered-events.h |   1 +
 tools/perf/util/session.c        |   6 +-
 10 files changed, 341 insertions(+), 30 deletions(-)

-- 
1.8.3.4