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

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Message-ID: <20160301173254.GT5083@two.firstfloor.org>
Date:	Tue, 1 Mar 2016 18:32:54 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	"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

> I tried what Andy suggested below (not sure what he meant by Merom,
> I took PEBS format0 instead), works for me

Thanks Jiri. Patch looks good to me.

Reviewed-by: Andi Kleen <ak@...ux.intel.com>

We may want to make this buffer size a configurable anyways because
with multi-record PEBS it can make sense to use much larger buffers
to reduce overhead.  But that could be done separately.

-Andi