linux-kernel - Re: [PATCH] perf: Fix intel shared extra msr allocation

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Message-ID: <4FD0030F.4040205@intel.com>
Date:	Thu, 07 Jun 2012 09:25:35 +0800
From:	"Yan, Zheng" <zheng.z.yan@...el.com>
To:	Stephane Eranian <eranian@...gle.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	"Yan, Zheng" <zheng.z.yan@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf: Fix intel shared extra msr allocation

On 06/06/2012 06:12 PM, Stephane Eranian wrote:
> There is something wrong with this patch, I instrumented the code
> and I can see:
> [ 1377.324575] 1. idx=1 reg_idx=1 ref=-1 config=0xff01 era->config=0xff01
>                                                    ^^^^^^
> The test case on WSM (RSP0, RSP1):
> 
> $ perf stat  -a -C13 -e
> offcore_response_1:dmnd_data_rd,offcore_response_1:dmnd_data_rd sleep
> 100 &
> $ perf stat -a -C1 -e offcore_response_1:dmnd_rfo sleep 1
> 
> I think this happens during scheduling of the events, i.e., during the
> run and not on initial
> programming. That could happen with cgroups, for instance.
> 

Maybe we need adjust shared MSRs' reference counts in intel_fixup_er() ?
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