linux-kernel - Re: [PATCH] SLUB: revert direct page allocator pass through

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Message-Id: <200901240241.06670.nickpiggin@yahoo.com.au>
Date:	Sat, 24 Jan 2009 02:41:06 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	yanmin_zhang@...ux.intel.com, Andi Kleen <andi@...stfloor.org>,
	Matthew Wilcox <matthew@....cx>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] SLUB: revert direct page allocator pass through

On Saturday 24 January 2009 02:25:06 Christoph Lameter wrote:
> On Fri, 23 Jan 2009, Pekka Enberg wrote:
> > On Fri, Jan 23, 2009 at 5:03 PM, Christoph Lameter
> >
> > <cl@...ux-foundation.org> wrote:
> > > It seems that we currently need the slab allocators to compensate for
> > > the performance problems in the page allocator for these higher order
> > > allocs. I'd rather have the page allocator fixed but things are as they
> > > are.
> >
> > So, is that an ACK or a NAK for the patch?-)
>
> Doesnt that break down Nick's order-0 dominates-the-world scheme break
> down?

SLUB is your scheme. And yes it definitely goes against my liking of
order-0 allocations regardless of this patch.


> One of the reasons for doing this was to get the page allocator
> performance issues exposed and addressed.

Page allocator is never going to be as fast as slab allocator, for
issues I explained a long time ago. Not to say it can't be improved,
just stating facts.

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