linux-kernel - Re: [PATCH 02/25] perf stat record: Add record command

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Date:	Fri, 6 Nov 2015 15:13:29 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Kan Liang <kan.liang@...el.com>
Subject: Re: [PATCH 02/25] perf stat record: Add record command

On Fri, Nov 06, 2015 at 10:33:03AM -0300, Arnaldo Carvalho de Melo wrote:

SNIP

> 
> Humm, no, there are several things we should strive for, and
> bisectability is one of the first, it requires smaller, self contained
> patches, sure, but it also requires that at after applying each patch we
> have sane output from the tools.
> 
> So, after applying the patch above we get a message that says the file
> is corrupted, and more than that, it even forgets to put a newline,
> further breaking the output.

well, because the 'perf stat record' creates just minimal
perf.data and I'm adding data itself in later commits

>  
> > [PATCH 02/25] perf stat record: Add record command
> >    - adds record command that creates empty perf.data
> > 
> > [PATCH 03/25] perf stat record: Initialize record features
> >    - adds FEATURES initialization for stat data
> > 
> > [PATCH 04/25] perf stat record: Synthesize stat record data
> >    - adds meta data
> > 
> > [PATCH 05/25] perf stat record: Store events IDs in perf data file
> >    - adds event IDs
> > ...
> > 
> > 
> > you get proper warning right after patch 3/25, where
> > we store STAT feature bit and properly check it when
> > opening perf.data
> 
> But that will be will _new_ tools, right? I'm talking about getting sane
> output from _older_, unmodified, tools, like I demonstrated.

new and old.. there's change to react on STAT feature
during opening perf data file in 03/25 that fixes the
issue.. I moved it from 'report' command patch earlier
in the patchset

jirka
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