linux-kernel - Re: [GIT PULL] perf fixes

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Message-ID: <AANLkTi=V61L6vgFZ_4u20dZvv2=tvi-XJMc2HqOnjMo4@mail.gmail.com>
Date:	Tue, 25 Jan 2011 06:27:31 +1000
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] perf fixes

On Tue, Jan 25, 2011 at 6:17 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> It only happens for me with "g". With "perf record -af sleep 10" it worked.

Actually, it's something subtler than that. It must depend on the
actual data, because now when I tried it again, it worked with 'g'
too. I hadn't saved the old perf.data that caused the lockup (it got
overwritten by the non-g test), and now when I try to re-create it it
doesn't hang on the result.

So it's probably some very specific data pattern that causes it.

(And I don't know if it's a hard hang - it could just be something
_very_ slow. But we're talking half a minute kind of slow).

                     Linus
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