linux-kernel - Re: [RFC PATCH 1/2] perf_events: add support for per-cpu per-cgroup monitoring (v2)

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Message-ID: <AANLkTimZYnfHUHoXC6ncCVDaugHZZ0YNQdjvsOpOwxiY@mail.gmail.com>
Date:	Wed, 8 Sep 2010 15:59:11 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	eranian@...il.com, linux-kernel@...r.kernel.org, mingo@...e.hu,
	paulus@...ba.org, davem@...emloft.net, fweisbec@...il.com,
	perfmon2-devel@...ts.sf.net, robert.richter@....com,
	acme@...hat.com
Subject: Re: [RFC PATCH 1/2] perf_events: add support for per-cpu per-cgroup
 monitoring (v2)

On Wed, Sep 8, 2010 at 3:57 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, 2010-09-08 at 15:56 +0200, stephane eranian wrote:
>> On Wed, Sep 8, 2010 at 3:52 PM, Peter Zijlstra <peterz@...radead.org> wrote:
>> > On Wed, 2010-09-08 at 15:30 +0200, Stephane Eranian wrote:
>> >> +       } times[NR_CPUS] ____cacheline_aligned_in_smp;
>> >
>> > That's fail! NR_CPUS can be like 4k for distro configs.
>> >
>> How do you do this on struct that are dynamically allocated?
>> The number of css is dynamic.
>
> alloc_percpu()?
>
Ok, I will look into this. Thanks.
Clearly we can kmalloc() the array. But it would be nicer to have one
struct allocated per-cpu (avoid the cacheline_aligned_in_smp stuff).
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