linux-kernel - Re: [RFC/PATCH 00/14] perf record: Add support to store data in directory

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Message-ID: <20190204114144.GC18141@krava>
Date:   Mon, 4 Feb 2019 12:41:44 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [RFC/PATCH 00/14] perf record: Add support to store data in
 directory

On Mon, Feb 04, 2019 at 02:29:56PM +0300, Alexey Budankov wrote:
> On 04.02.2019 13:36, Jiri Olsa wrote:
> > On Mon, Feb 04, 2019 at 01:12:11PM +0300, Alexey Budankov wrote:
> >>
> >> Hi,
> >>
> >> On 03.02.2019 18:30, Jiri Olsa wrote:
> >>> hi,
> >>> this patchset adds the --dir option to record command (and all
> >>> the other record command that overload cmd_record) that allows
> >>> the data to be stored in directory with multiple data files.
> >>>
> >>> It's next step for multiple threads implementation in record.
> >>> It's now possible to make directory data via --dir option, like:
> >>>
> >>>   $ perf record --dir perf bench sched messaging
> >>
> >> Is it possible to name data directory differently from perf.data 
> >> e.g. using --output option, like this?
> >>
> >>   $ perf record --output result_1 --dir perf bench sched messaging
> > 
> > 
> > yep, it's taken into account:
> > 
> > [jolsa@...va perf]$ ./perf record --output result_1 --dir ./perf bench sched messaging
> > Couldn't synthesize bpf events.
> > # Running 'sched/messaging' benchmark:
> > # 20 sender and receiver processes per group
> > # 10 groups == 400 processes run
> > 
> >      Total time: 0.177 [sec]
> > [ perf record: Woken up 1 times to write data ]
> > [ perf record: Captured and wrote 0.316 MB result_1 (7225 samples) ]
> > 
> > [jolsa@...va perf]$ ll result_1/
> > total 348
> > -rw-------. 1 jolsa jolsa 27624 Feb  4 11:35 data.0
> > -rw-------. 1 jolsa jolsa 56672 Feb  4 11:35 data.1
> > -rw-------. 1 jolsa jolsa 30824 Feb  4 11:35 data.2
> > -rw-------. 1 jolsa jolsa 49136 Feb  4 11:35 data.3
> > -rw-------. 1 jolsa jolsa 22712 Feb  4 11:35 data.4
> > -rw-------. 1 jolsa jolsa 53392 Feb  4 11:35 data.5
> > -rw-------. 1 jolsa jolsa 43352 Feb  4 11:35 data.6
> > -rw-------. 1 jolsa jolsa 46688 Feb  4 11:35 data.7
> > -rw-------. 1 jolsa jolsa  9068 Feb  4 11:35 header
> 
> Awesome. What do you think about having it like this:
> 
>   $ perf record --output result_1.data ... - writes data to a file
> 
>   $ perf record --dir result_1 ... - or even
>   $ perf record --output_dir result_1 ... - writes data into a directory
> 
> IMHO, this interface is simpler for a user.

yep, seems more convenient.. I'll add it

thanks,
jirka