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

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Message-ID: <20131001180609.GB8998@gmail.com>
Date:	Tue, 1 Oct 2013 20:06:09 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	David Ahern <dsahern@...il.com>,
	Namhyung Kim <namhyung@...nel.org>,
	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


* Arnaldo Carvalho de Melo <acme@...stprotocols.net> wrote:

> Em Tue, Oct 01, 2013 at 05:33:09PM +0200, Ingo Molnar escreveu:
> > 
> > * 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:
>  
> I liked this last one:
> 
> >   WARNING: The perf.data file's data size field is 0 which is unexpected.
> >            Was the 'perf record' command properly terminated?
> 
> Can I patch that up into Namhyung's latest patch?

Sure, feel free!

Thanks,

	Ingo
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