linux-kernel - Re: [PATCH] perf session: Fix infinite loop on invalid perf.data file

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Date:	Tue, 1 Oct 2013 17:33:09 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>, Sonny Rao <sonnyrao@...omium.org>
Subject: Re: [PATCH] perf session: Fix infinite loop on invalid perf.data file


* David Ahern <dsahern@...il.com> wrote:

> On 10/1/13 8:21 AM, Ingo Molnar wrote:
> >But if I understood it correctly this particular message could trigger for
> >regular users of perf as well, of the perf record is terminated in some
> >unusual fashion. Regular users might not have the perf code handy (and
> >might not know about git grep either).
> 
> This is the case I was referring to -- normal users don't care about
> the code reference, hence the more specific question about how the
> perf-record session ended.

Hm, what do you call 'code reference'?

The message I suggested is:

  WARNING: perf/header: Data size is 0. Was the 'perf record' command properly terminated?

I didn't intend 'perf/header' to be a code reference - it wanted to refer 
to the perf.data header. Maybe that should be formulated in a less 
confusing manner? Something like:

  WARNING: The perf.data file's data size field is 0 which is unexpected.
           Was the 'perf record' command properly terminated?

Thanks,

	Ingo
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