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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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