linux-kernel - Re: [patch] SLQB slab allocator (try 2)

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Message-ID: <alpine.DEB.1.10.0902041049090.19633@qirst.com>
Date:	Wed, 4 Feb 2009 10:49:46 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
cc:	Mel Gorman <mel@....ul.ie>, Pekka Enberg <penberg@...helsinki.fi>,
	Nick Piggin <npiggin@...e.de>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lin Ming <ming.m.lin@...el.com>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Subject: Re: [patch] SLQB slab allocator (try 2)

On Tue, 3 Feb 2009, Nick Piggin wrote:

> > so the max_order is inclusive not exclusive. This will force the order-0
> > allocations I think you are looking for.
>
> Well, but in the case of really bad internal fragmentation in the page,
> SLAB will do order-1 allocations even if it doesn't strictly need to.
> Probably this isn't a huge deal, but I think if we do slub_min_objects=1,
> then SLUB won't care about number of objects per page, and slub_max_order=1
> will mean it stops caring about fragmentation after order-1. I think. Which
> would be pretty close to SLAB (depending on exactly how much fragmentation
> it cares about).

slub_max_order=0 will fore all possible slabs to order 0. This means that
some slabs that SLAB will run as order 1 will be order 0 under SLUB.
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