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

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Message-ID: <20090612094918.GH24044@wotan.suse.de>
Date:	Fri, 12 Jun 2009 11:49:19 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	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 07:44:25PM +1000, Benjamin Herrenschmidt wrote:
> On Fri, 2009-06-12 at 11:30 +0200, Nick Piggin wrote:
> > On Fri, Jun 12, 2009 at 07:24:20PM +1000, Benjamin Herrenschmidt wrote:
> > Yeah but it doesn't do it in the page allocator so it isn't
> > really useful as a general allocator flags tweak. ATM it only
> > helps this case of slab allocator hackery.
> 
> I though I did it in page_alloc.c too but I'm happy to be told what I
> missed :-) The intend is certainly do have a general allocator flag
> tweak.

Oh, no I missed that sorry you did. I'd be a bit worried about
wanting it as a general allocator tweak. Even suspending IO
for suspend/resume... it would be better to try solving that
ordering by design and if not then perhaps add something
to mm/vmscan.c rather than modify gfp flags all the way
down.


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