linux-kernel - Re: [PATCH 2/2] perf/x86: Uncore Filter support for SandyBridge-EP

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Date:	Thu, 28 Jun 2012 09:30:17 +0800
From:	"Yan, Zheng" <zheng.z.yan@...el.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	eranian@...gle.com, mingo@...e.hu, andi@...stfloor.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] perf/x86: Uncore Filter support for SandyBridge-EP

On 06/27/2012 06:06 PM, Peter Zijlstra wrote:
> On Wed, 2012-06-27 at 15:09 +0800, Yan, Zheng wrote:
>> > @@ -1048,10 +1190,9 @@ static int uncore_validate_group(struct intel_uncore_pmu *pmu,
>> >  {
>> >         struct perf_event *leader = event->group_leader;
>> >         struct intel_uncore_box *fake_box;
>> > -       int assign[UNCORE_PMC_IDX_MAX];
>> >         int ret = -EINVAL, n;
>> >  
>> > -       fake_box = uncore_alloc_box(smp_processor_id());
>> > +       fake_box = uncore_alloc_box(pmu->type, smp_processor_id());
>> >         if (!fake_box)
>> >                 return -ENOMEM;
>> >  
>> > @@ -1073,7 +1214,7 @@ static int uncore_validate_group(struct intel_uncore_pmu *pmu,
>> >  
>> >         fake_box->n_events = n;
>> >  
>> > -       ret = uncore_assign_events(fake_box, assign, n);
>> > +       ret = uncore_assign_events(fake_box, NULL, n);
>> >  out:
>> >         kfree(fake_box);
>> >         return ret; 
> Isn't the uncore now suffering the same problem you found for the
> regular extra stuff?

The snbep_uncore_get/put_constraint(...) has check for that. The uncore case is simpler,
because we don't need try swapping RSP_0/RSP_1.

Regards
Yan, Zheng

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