linux-kernel - Re: [PATCH v5] perf record: Add support for limit perf output file size

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Date:   Wed, 6 Nov 2019 15:58:07 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     jsun4 <jiwei.sun@...driver.com>, acme@...hat.com,
        arnaldo.melo@...il.com, linux-kernel@...r.kernel.org,
        alexander.shishkin@...ux.intel.com, mpetlan@...hat.com,
        namhyung@...nel.org, a.p.zijlstra@...llo.nl,
        adrian.hunter@...el.com, Richard.Danter@...driver.com,
        jiwei.sun.bj@...com
Subject: Re: [PATCH v5] perf record: Add support for limit perf output file
 size

Em Fri, Nov 01, 2019 at 09:13:00AM +0100, Jiri Olsa escreveu:
> On Tue, Oct 22, 2019 at 04:09:01PM +0800, jsun4 wrote:
> > The patch adds a new option to limit the output file size, then based
> > on it, we can create a wrapper of the perf command that uses the option
> > to avoid exhausting the disk space by the unconscious user.
> > 
> > In order to make the perf.data parsable, we just limit the sample data
> > size, since the perf.data consists of many headers and sample data and
> > other data, the actual size of the recorded file will bigger than the
> > setting value.
> > 
> > Testing it:
> > 
> >  # ./perf record -a -g --max-size=10M
> >  Couldn't synthesize bpf events.
> >  [ perf record: perf size limit reached (10249 KB), stopping session ]
> >  [ perf record: Woken up 32 times to write data ]
> >  [ perf record: Captured and wrote 10.133 MB perf.data (71964 samples) ]
> > 
> >  # ls -lh perf.data
> >  -rw------- 1 root root 11M Oct 22 14:32 perf.data
> > 
> >  # ./perf record -a -g --max-size=10K
> >  [ perf record: perf size limit reached (10 KB), stopping session ]
> >  Couldn't synthesize bpf events.
> >  [ perf record: Woken up 0 times to write data ]
> >  [ perf record: Captured and wrote 1.546 MB perf.data (69 samples) ]
> > 
> >  # ls -l perf.data
> >  -rw------- 1 root root 1626952 Oct 22 14:36 perf.data
> > 
> > Signed-off-by: Jiwei Sun <jiwei.sun@...driver.com>
> > ---
> > v5 changes:
> >   - Change the output format like [ perf record: perf size limit XX ]
> >   - change the killing perf way from "raise(SIGTERM)" to set "done == 1"
> 
> Acked-by: Jiri Olsa <jolsa@...nel.org>

Thanks, applied.

- Arnaldo