From: Andrew Morton <akpm@linux-foundation.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: Mel Gorman <mel@csn.ul.ie>,
linux-mm@kvack.org, Nick Piggin <npiggin@suse.de>,
Pekka J Enberg <penberg@cs.helsinki.fi>
Subject: Re: SLUB tbench regression due to page allocator deficiency
Date: Sat, 9 Feb 2008 14:35:18 -0800 [thread overview]
Message-ID: <20080209143518.ced71a48.akpm@linux-foundation.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0802091332450.12965@schroedinger.engr.sgi.com>
On Sat, 9 Feb 2008 13:45:11 -0800 (PST) Christoph Lameter <clameter@sgi.com> wrote:
> Isnt there a way that we can make the page allocator handle PAGE_SIZEd
> allocations in such a way that is competitive with the slab allocators?
> The cycle count for an allocation needs to be <100 not just below 1000 as
> it is now.
>
Well. Where are the cycles spent?
We are notorious for sucking but I don't think even we suck enough to have
left a 10x optimisation opportunity in the core page allocator ;)
> include/linux/slub_def.h | 6 +++---
> mm/slub.c | 25 +++++++++++++++++--------
I am worrried by a patch which squeezes a few percent out of tbench. Does
it improve real things? Does anything regress?
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next prev parent reply other threads:[~2008-02-09 22:35 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-09 21:45 SLUB tbench regression due to page allocator deficiency Christoph Lameter
2008-02-09 22:35 ` Andrew Morton [this message]
2008-02-10 0:19 ` Christoph Lameter
2008-02-10 2:45 ` Nick Piggin
2008-02-10 3:36 ` Christoph Lameter
2008-02-10 3:39 ` Christoph Lameter
2008-02-10 23:24 ` Nick Piggin
2008-02-11 19:14 ` Christoph Lameter
2008-02-11 22:03 ` Christoph Lameter
2008-02-11 7:18 ` Nick Piggin
2008-02-11 19:21 ` Christoph Lameter
2008-02-11 23:40 ` Nick Piggin
2008-02-11 23:42 ` Christoph Lameter
2008-02-11 23:56 ` Nick Piggin
2008-02-12 0:08 ` Christoph Lameter
2008-02-12 6:06 ` Fastpath prototype? Christoph Lameter
2008-02-12 10:40 ` Andi Kleen
2008-02-12 20:10 ` Christoph Lameter
2008-02-12 22:31 ` Christoph Lameter
2008-02-13 11:38 ` Andi Kleen
2008-02-13 20:09 ` Christoph Lameter
2008-02-13 18:33 ` SLUB tbench regression due to page allocator deficiency Paul Jackson
2008-02-11 13:50 ` Mel Gorman
2008-02-13 11:15 ` Mel Gorman
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