linux-kernel - Re: [patch] SLQB slab allocator

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Message-ID: <alpine.DEB.1.10.0902041507050.8154@qirst.com>
Date:	Wed, 4 Feb 2009 15:09:15 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Nick Piggin <npiggin@...e.de>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Lin Ming <ming.m.lin@...el.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch] SLQB slab allocator

On Wed, 4 Feb 2009, Nick Piggin wrote:

> That's very true, and we touched on this earlier. It is I guess
> you can say a downside of queueing. But an analogous situation
> in SLUB would be that lots of pages on the partial list with
> very few free objects, or freeing objects to pages with few
> objects in them. Basically SLUB will have to do the extra work
> in the fastpath.

But these are pages with mostly allocated objects and just a few objects
free. The SLAB case is far worse: You have N objects on a queue and they
are keeping possibly N pages away from the page allocator and in those
pages *nothing* is used.

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