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

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Date:   Tue, 6 Mar 2018 09:53:20 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Cong Wang <xiyou.wangcong@...il.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

> 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?

If you had metrics on line 1 it would be correct.

So you just shifted it to break that case.

If you always want to have the same number of fields
you need to add two empty fields to the normal output
when there are no metrics.

-Andi