linux-kernel - Re: [PATCH] perf stat: fix cvs output format

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Message-ID: <CAM_iQpUfRMW4aGfaTdFqCRwuuLXFX69Aewg+k-aa6BMUKSrhTA@mail.gmail.com>
Date:   Tue, 6 Mar 2018 09:47:09 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Jiri Olsa <jolsa@...hat.com>, Ilya Pronin <ipronin@...tter.com>
Subject: Re: [PATCH] perf stat: fix cvs output format

On Tue, Mar 6, 2018 at 9:00 AM, Andi Kleen <ak@...ux.intel.com> wrote:
> On Mon, Mar 05, 2018 at 10:43:53PM -0800, Cong Wang wrote:
>> From: Ilya Pronin <ipronin@...tter.com>
>>
>> When printing stats in CSV mode, perf stat appends extra CSV
>> separators when counter is not supported:
>>
>> <not supported>,,L1-dcache-store-misses,mesos/bd442f34-2b4a-47df-b966-9b281f9f56fc,0,100.00,,,,
>>
>> which causes a failure of parsing fields. The numbers of separators
>
> Causes failure in what?

Failed to know how many fields in that line, clearly there are less
separators when it is supported.


>
>> is fixed for each line, no matter supported or not supported.
>
> I don't think they're extra fields, there are cases where they can be filled out
> for variance, metricvalue, unit. And other code in perf too uses empty
> fields when something is not available.

Are you saying there should be more fields when it is not supported?

Here is the output from your own commit:

      423470,,stalled-cycles-frontend,509102,100.00,65.69,frontend cycles idle
      <not supported>,,stalled-cycles-backend,0,100.00,,,,

so line 1 has 7 fields, line 2 has 9 fields, and this is expected?