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Date: Fri, 12 Jun 2009 11:49:31 +0300
Message-ID: <84144f020906120149k6cbe5177vef1944d9d216e8b2@mail.gmail.com>
Subject: Re: slab: setup allocators earlier in the boot sequence
From: Pekka Enberg <penberg@cs.helsinki.fi>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Nick Piggin <npiggin@suse.de>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Linux Kernel list <linux-kernel@vger.kernel.org>,
       linux-mm <linux-mm@kvack.org>, mingo@elte.hu, cl@linux-foundation.org,
       akpm@linux-foundation.org
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On Fri, Jun 12, 2009 at 11:44 AM, Benjamin
Herrenschmidt<benh@kernel.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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