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

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Message-ID: <CAPz6YkWOQ4_YPHjHYM5-rUc7wj1Ygikdk2EFTCPGyaKmb+DuqQ@mail.gmail.com>
Date:	Mon, 30 Sep 2013 17:28:41 -0700
From:	Sonny Rao <sonnyrao@...omium.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>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH] perf session: Fix infinite loop on invalid perf.data file

On Mon, Sep 30, 2013 at 6:49 AM, David Ahern <dsahern@...il.com> wrote:
> On 9/30/13 2:19 AM, Namhyung Kim wrote:
>>
>> From: Namhyung Kim <namhyung.kim@....com>
>>
>> perf-record updates the header in the perf.data file at termination.
>> Without this update perf-report (and other processing built-ins) it
>> caused an infinite loop when perf report (or something like) called.
>>
>> This is because the algorithm in __perf_session__process_events()
>> depends on the data_size which is read from file header.  Use file
>> size directly instead in this case to do the best-effort processing.
>>
>> Cc: David Ahern <dsahern@...il.com>
>> Cc: Sonny Rao <sonnyrao@...omium.org>
>> Signed-off-by: David Ahern <dsahern@...il.com>
>> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
>
>
> worked ok for me. Sonny can you verify?

Yes, it works for me as well, thanks!


> David
>
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