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

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Message-ID: <1288173442.15336.1490.camel@twins>
Date:	Wed, 27 Oct 2010 11:57:22 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Brian Gerst <brgerst@...il.com>, tj@...nel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	mingo@...e.hu
Subject: Re: [PATCH] x86-32: Allocate irq stacks seperate from percpu area

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);


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