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

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Message-ID: <alpine.DEB.1.10.0901231057280.32253@qirst.com>
Date:	Fri, 23 Jan 2009 10:59:17 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
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 Sat, 24 Jan 2009, Nick Piggin wrote:

> 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.

Why not? Remember the discussion we had a while ago. You can bring the
pages into a state where minimal manipulations are required for alloc free
and avoid all the checks in the hot paths. The SLUB method could be used
taking a big contiguous chunk and then issueing page size portions of it.
That could be quite fast.

Or if you prefer order-0. Do a single linked list like SLQB does.

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