linux-kernel - Re: [PATCH] perf, x86: Fix Intel shared extra MSR allocation

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Date:	Wed, 6 Jun 2012 13:43:50 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, zheng.z.yan@...ux.intel.com
Subject: Re: [PATCH] perf, x86: Fix Intel shared extra MSR allocation

On Wed, Jun 6, 2012 at 12:53 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, 2012-06-06 at 12:36 +0200, Peter Zijlstra wrote:
>> On Wed, 2012-06-06 at 12:35 +0200, Stephane Eranian wrote:
>> > Ok, I found the problem. It was in intel_fixup_er().
>> > Unlike in the original code, this routine must update
>> > the event->extra_reg.idx to the idx parameter instead
>> > of trying to swap out from it.
>>
>> Ah indeed. Thanks!
>
>
> static void intel_fixup_er(struct perf_event *event, int idx)
> {
>        event->hw.extra_reg.idx = idx;
>
>        if (idx == EXTRA_REG_RSP_0) {
>                event->hw.config &= ~INTEL_ARCH_EVENT_MASK;
>                event->hw.config |= 0x01b7;
>                event->hw.extra_reg.reg = MSR_OFFCORE_RSP_0;
>        } else if (idx == EXTRA_REG_RSP_1) {
>                event->hw.config &= ~INTEL_ARCH_EVENT_MASK;
>                event->hw.config |= 0x01bb;
>                event->hw.extra_reg.reg = MSR_OFFCORE_RSP_1;
>        }
> }
>
> Like that then?

Yes.
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