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

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Message-ID: <1288159670.2652.181.camel@edumazet-laptop>
Date:	Wed, 27 Oct 2010 08:07:50 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Brian Gerst <brgerst@...il.com>
Cc:	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

Le mercredi 27 octobre 2010 à 01:43 -0400, Brian Gerst a écrit :
> The percpu allocator cannot handle alignments larger than one page.
> Allocate the irq stacks seperately, and only keep the pointers as
> percpu data.
> 
> Signed-off-by: Brian Gerst <brgerst@...il.com>

>  
> -	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.



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