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

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Message-ID: <7d5fd554-0d6e-6b25-b4fd-b13b539c87f6@linux.intel.com>
Date:   Mon, 4 Feb 2019 22:56:27 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Jiri Olsa <jolsa@...hat.com>
Cc:     Jiri Olsa <jolsa@...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>
Subject: Re: [RFC/PATCH 00/14] perf record: Add support to store data in
 directory

On 04.02.2019 22:27, Arnaldo Carvalho de Melo wrote:
> Em Mon, Feb 04, 2019 at 10:56:05AM -0800, Stephane Eranian escreveu:
>> On Mon, Feb 4, 2019 at 3:41 AM Jiri Olsa <jolsa@...hat.com> wrote:
>>>
>>> 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
>>>
>> But what happens if you do: perf record -o foo --output_dir foo.d?
> 
> Should fail, i.e. either you use single-file or directory output, I
> think.

I also expect it this way.

Alexey

> 
> - Arnaldo
>