linux-kernel - Re: [PATCH 2/5] perf: generic intel uncore support

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Date:	Tue, 03 Apr 2012 00:24:39 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	mingo@...e.hu, andi@...stfloor.org, eranian@...gle.com,
	linux-kernel@...r.kernel.org, ming.m.lin@...el.com
Subject: Re: [PATCH 2/5] perf: generic intel uncore support

On Sun, 2012-04-01 at 11:11 +0800, Yan, Zheng wrote:
> 
> >> +static int __init uncore_type_init(struct intel_uncore_type *type)
> >> +{
> >> +       struct intel_uncore_pmu *pmus;
> >> +       struct attribute_group *events_group;
> >> +       struct attribute **attrs;
> >> +       int i, j;
> >> +
> >> +       pmus = kzalloc(sizeof(*pmus) * type->num_boxes, GFP_KERNEL);
> >> +       if (!pmus)
> >> +               return -ENOMEM;
> > 
> > Hmm, but if you have a pmu per number of boxes, then what do you need
> > that  pmu->box reference for?
> 
> Type->num_boxes is number of boxes within one physical cpu. pmu->box_hash
> is needed because there can be several physical cpus in a system.  

Ah, indeed. 

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