linux-kernel - Re: [BUG] Core2 cpu triggers hard lockup with perf test

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Message-ID: <20160301145909.GS6356@twins.programming.kicks-ass.net>
Date:	Tue, 1 Mar 2016 15:59:09 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Jiri Olsa <jolsa@...hat.com>, "Liang, Kan" <kan.liang@...el.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Wang Nan <wangnan0@...wei.com>,
	"zheng.z.yan@...el.com" <zheng.z.yan@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] Core2 cpu triggers hard lockup with perf test

On Tue, Mar 01, 2016 at 03:51:05PM +0100, Andi Kleen wrote:
> > im on it.. also the patch that makes this happen just
> > enlarge the buffer for PEBS:
> > 
> >   156174999dd1 perf/intel/x86: Enlarge the PEBS buffer
> > 
> > but I did not find anyaPEBS buffer lenght limitations in SDM
> 
> May be the easiest would be to just keep the old buffer size
> on Merom.

I would still like to know why it breaks though. Just changing code
about because it makes fail go away is never the right answer.