linux-kernel - Re: slab: setup allocators earlier in the boot sequence

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Date:	Fri, 12 Jun 2009 11:49:31 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Nick Piggin <npiggin@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, mingo@...e.hu,
	cl@...ux-foundation.org, akpm@...ux-foundation.org
Subject: Re: slab: setup allocators earlier in the boot sequence

On Fri, Jun 12, 2009 at 11:44 AM, Benjamin
Herrenschmidt<benh@...nel.crashing.org> wrote:
> On Fri, 2009-06-12 at 11:04 +0300, Pekka Enberg wrote:
>> Hi Nick,
>>
>> On Fri, 2009-06-12 at 10:02 +0200, Nick Piggin wrote:
>> > Fair enough, but this can be done right down in the synchronous
>> > reclaim path in the page allocator. This will catch more cases
>> > of code using the page allocator directly, and should be not
>> > as hot as the slab allocator.
>>
>> So you want to push the local_irq_enable() to the page allocator too? We
>> can certainly do that but I think we ought to wait for Andrew to merge
>> Mel's patches to mainline first, OK?
>
> Doesn't my patch take care of all the cases in a much more simple way ?

Nick, the patch Ben is talking about is here:

http://patchwork.kernel.org/patch/29700/

The biggest problem with the patch is that the gfp_smellybits is wide
open for abuse. Hmm.

                        Pekka
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