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

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Date:	Wed, 6 Jun 2012 12:12:40 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"Yan, Zheng" <zheng.z.yan@...ux.intel.com>,
	"Yan, Zheng" <zheng.z.yan@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf: Fix intel shared extra msr allocation

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.

On Tue, Jun 5, 2012 at 3:51 PM, Stephane Eranian <eranian@...gle.com> wrote:
> On Tue, Jun 5, 2012 at 3:47 PM, Peter Zijlstra <peterz@...radead.org> wrote:
>> On Tue, 2012-06-05 at 15:38 +0200, Stephane Eranian wrote:
>>
>>> Will try it on my systems. Though it appears the patch has some
>>> ^M all over.
>>
>> Yeah, stupid evolution can only do quoted-printable these days..
>> progress they call this :/
>>
>> I can send you an awk script to unmangle it if you want.. but git can do
>> it too somehow.
>
> Will try with git, otherwise can do it manually, patch is small enough.
> Thanks.
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