linux-kernel - Re: bisected: 'perf top' causing soft lockups under Xen

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Message-ID: <20120210192901.GK2526@infradead.org>
Date:	Fri, 10 Feb 2012 17:29:01 -0200
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Steven Noonan <steven@...inklabs.net>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...e.hu>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: bisected: 'perf top' causing soft lockups under Xen

Em Fri, Feb 10, 2012 at 11:27:23AM -0800, Steven Noonan escreveu:
> > [  160.172856] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S
> > [  160.172984] iwlwifi 0000:02:00.0: Radio type=0x1-0x2-0x0
> 
> It actually gets even more interesting. Once I did 'perf test' under
> Xen, and I waited for it to finish, perf suddenly works fine. I can
> re-run 'perf test -v 3' with no hangs, and can now run 'perf top' with
> no issue. Bizarre.

Heck, I keep wishing people use perf test more often to figure out bugs
sooner, but this side effect was surprising! ;-)

- Arnaldo
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