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Subject: Re: [PATCH] x86-32: Allocate irq stacks seperate from percpu area
From: Peter Zijlstra <peterz@infradead.org>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Brian Gerst <brgerst@gmail.com>, tj@kernel.org, x86@kernel.org,
        linux-kernel@vger.kernel.org, torvalds@linux-foundation.org,
        mingo@elte.hu
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Date: Wed, 27 Oct 2010 11:57:22 +0200
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On Wed, 2010-10-27 at 08:07 +0200, Eric Dumazet wrote:
> > -     irqctx = &per_cpu(hardirq_stack, cpu);
> > +     irqctx = (union irq_ctx *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER);
> 
> Hmm, then we lose NUMA affinity for stacks. 

I guess we could use:

  alloc_pages_node(cpu_to_node(cpu), THREAD_FLAGS, THREAD_ORDER);