Re: [PATCH 00/10] perf tools: Use SIGUSR2 control data dumpping

[Wangnan (F)]

On 2016/4/15 18:40, Jiri Olsa wrote:
> 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@xxxxxxxxxx
> >
> > Cc: Wang Nan <wangnan0@xxxxxxxxxx>
> > Cc: He Kuang <hekuang@xxxxxxxxxx>
> > Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> > Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
> > Cc: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
> > Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
> > Cc: Zefan Li <lizefan@xxxxxxxxxx>
> > Cc: pi3orama@xxxxxxx
> >
> > 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?

Sorry, you are not in the CC list. 'git send-email' failed to extract your
email address from the Acked-by tag.

I'll inform you after I putting them into a git branch. Please wait.

Thank you.