From: Christoph Lameter <clameter@sgi.com>
To: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>, Mel Gorman <mel@csn.ul.ie>,
Matt Mackall <mpm@selenic.com>,
linux-mm@kvack.org
Subject: Re: [patch 5/9] slub: Fallback to minimal order during slab page allocation
Date: Thu, 20 Mar 2008 11:29:44 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0803201128001.10474@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <1205989839.14496.32.camel@ymzhang>
On Thu, 20 Mar 2008, Zhang, Yanmin wrote:
> page->objects = (PAGE_SIZE << get_order(s->size)) / s->size;
>
>
> It'll look more readable and be simplified.
The earlier version of the fallback had that.
However, its a division in a potentially hot codepath.
And some architectures have slow division logic.
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next prev parent reply other threads:[~2008-03-20 18:29 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20080317230516.078358225@sgi.com>
[not found] ` <20080317230528.279983034@sgi.com>
2008-03-19 9:09 ` [patch 2/9] Store max number of objects in the page struct Zhang, Yanmin
2008-03-19 17:49 ` Christoph Lameter
2008-03-20 3:32 ` Zhang, Yanmin
2008-03-20 21:05 ` Christoph Lameter
2008-03-21 22:24 ` Andrew Morton
2008-03-22 3:27 ` Ben Pfaff
2008-03-24 1:22 ` [PATCH] Add definitions of USHORT_MAX and others Zhang, Yanmin
[not found] ` <20080317230528.939792410@sgi.com>
2008-03-20 5:10 ` [patch 5/9] slub: Fallback to minimal order during slab page allocation Zhang, Yanmin
2008-03-20 18:29 ` Christoph Lameter [this message]
2008-03-21 0:52 ` Zhang, Yanmin
2008-03-21 3:35 ` Christoph Lameter
2008-03-21 5:14 ` Zhang, Yanmin
2008-03-21 6:07 ` Christoph Lameter
2008-03-21 8:23 ` Zhang, Yanmin
[not found] ` <20080317230529.701336582@sgi.com>
2008-03-20 5:53 ` [patch 8/9] slub: Make the order configurable for each slab cache Zhang, Yanmin
2008-03-20 18:31 ` Christoph Lameter
2008-03-20 23:57 ` Christoph Lameter
[not found] ` <20080317230529.474353536@sgi.com>
2008-03-18 18:54 ` [patch 7/9] slub: Adjust order boundaries and minimum objects per slab Pekka Enberg
2008-03-18 19:00 ` Christoph Lameter
2008-03-19 1:04 ` Zhang, Yanmin
2008-03-19 15:20 ` Pekka Enberg
2008-03-20 6:44 ` Zhang, Yanmin
2008-03-20 18:32 ` Christoph Lameter
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