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SubjectRe: [PATCH 00/10] perf tools: Use SIGUSR2 control data dumpping
On Wed, Apr 13, 2016 at 08:21:03AM +0000, Wang Nan wrote:
> 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@huawei.com>
> Cc: He Kuang <hekuang@huawei.com>
> Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
> Cc: Jiri Olsa <jolsa@kernel.org>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
> Cc: Namhyung Kim <namhyung@kernel.org>
> Cc: Zefan Li <lizefan@huawei.com>
> Cc: pi3orama@163.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

I did not get 3/10 patch and the patchset did not apply cleanly,
git am failed.. would you have it in a branch somewhere?

thanks,
jirka

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