linux-kernel - Re: [PATCH] x86-32: Allocate irq stacks seperate from percpu area

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Date:	Wed, 27 Oct 2010 17:30:53 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Brian Gerst <brgerst@...il.com>, tj@...nel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86-32: Allocate irq stacks seperate from percpu area


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Tue, Oct 26, 2010 at 10:43 PM, Brian Gerst <brgerst@...il.com> wrote:
> > The percpu allocator cannot handle alignments larger than one page.
> > Allocate the irq stacks seperately, and only keep the pointers as
> > percpu data.
> 
> Ok, so I definitely want this (although it sounds like it would be good to do the 
> allocation numa-aware - possibly a separate issue).
> 
> However, I also want to remove all the crap that got added for the multi-page 
> percpu support. It was ugly, and apparently never really worked. All the 
> PER_CPU_MULTIPAGE_ALIGNED crud just needs to go away.
> 
> Ingo, can you take care of this all, or should I just take the patch and remove 
> the multipage stuff manually?

Sure, i'm queuing up Brian's patch (initially wanted to wait for the NUMA-aware 
version) and will remove all the multipage pcpu bits - will send you a pull request 
later today, after a bit of testing.

Thanks,

	Ingo
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