From: Minchan Kim <minchan.kim@gmail.com>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: Mel Gorman <mel@csn.ul.ie>, Tejun Heo <tj@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Bob Liu <lliubbo@gmail.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 2/6] change alloc function in pcpu_alloc_pages
Date: Thu, 22 Apr 2010 02:06:22 +0900 [thread overview]
Message-ID: <i2t28c262361004211006yc1301a84ncf9b3acbff37e212@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1004210914570.4959@router.home>
On Wed, Apr 21, 2010 at 11:15 PM, Christoph Lameter
<cl@linux-foundation.org> wrote:
> On Tue, 20 Apr 2010, Mel Gorman wrote:
>
>> alloc_pages_exact_node() avoids a branch in a hot path that is checking for
>> something the caller already knows. That's the reason it exists.
>
> We can avoid alloc_pages_exact_node() by making all callers of
> alloc_pages_node() never use -1. -1 is ambiguous and only rarely will a
> caller pass that to alloc_pages_node().
That's very reasonable to me.
Then, we can remove alloc_pages_exact_node and nid < 0 check in
alloc_pages_node at the same time.
Mel. Could you agree?
Firstly Tejun suggested this but I didn't got the point.
Sorry for bothering you.
Okay. I will dive into this approach.
Thanks for careful review, All.
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Kind regards,
Minchan Kim
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next prev parent reply other threads:[~2010-04-21 17:06 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-13 15:24 [PATCH 1/6] Remove node's validity check in alloc_pages Minchan Kim
2010-04-13 15:24 ` [PATCH 2/6] change alloc function in pcpu_alloc_pages Minchan Kim
2010-04-13 15:48 ` Mel Gorman
2010-04-14 23:39 ` Tejun Heo
2010-04-15 1:31 ` Minchan Kim
2010-04-15 7:21 ` Tejun Heo
2010-04-15 8:00 ` Minchan Kim
2010-04-15 8:15 ` Tejun Heo
2010-04-15 9:40 ` Minchan Kim
2010-04-15 10:08 ` Tejun Heo
2010-04-15 10:21 ` Minchan Kim
2010-04-15 10:33 ` Minchan Kim
2010-04-15 11:43 ` Tejun Heo
2010-04-15 11:49 ` Minchan Kim
2010-04-16 16:07 ` Christoph Lameter
2010-04-16 19:13 ` Lee Schermerhorn
2010-04-18 15:55 ` Minchan Kim
2010-04-18 15:54 ` Minchan Kim
2010-04-18 21:22 ` Tejun Heo
2010-04-19 0:03 ` Minchan Kim
2010-04-19 17:45 ` Christoph Lameter
2010-04-20 0:20 ` Minchan Kim
2010-04-19 17:38 ` Christoph Lameter
2010-04-19 22:27 ` Tejun Heo
2010-04-20 15:05 ` Mel Gorman
2010-04-21 10:48 ` Tejun Heo
2010-04-22 10:15 ` Minchan Kim
2010-04-21 14:15 ` Christoph Lameter
2010-04-21 17:06 ` Minchan Kim [this message]
2010-04-13 15:25 ` [PATCH 3/6] change alloc function in alloc_slab_page Minchan Kim
2010-04-13 15:52 ` Mel Gorman
2010-04-13 16:01 ` Minchan Kim
2010-04-13 16:14 ` Mel Gorman
2010-04-13 21:37 ` David Rientjes
2010-04-13 23:40 ` Minchan Kim
2010-04-13 23:55 ` David Rientjes
2010-04-14 0:02 ` Minchan Kim
2010-04-14 0:18 ` KAMEZAWA Hiroyuki
2010-04-14 12:23 ` Pekka Enberg
2010-04-16 16:10 ` Christoph Lameter
2010-04-18 18:49 ` Pekka Enberg
2010-04-19 9:05 ` Mel Gorman
2010-04-13 15:25 ` [PATCH 4/6] change alloc function in vmemmap_alloc_block Minchan Kim
2010-04-13 15:59 ` Mel Gorman
2010-04-14 0:19 ` KAMEZAWA Hiroyuki
2010-04-13 15:25 ` [PATCH 5/6] change alloc function in __vmalloc_area_node Minchan Kim
2010-04-13 16:02 ` Mel Gorman
2010-04-14 0:22 ` KAMEZAWA Hiroyuki
2010-04-14 0:33 ` Minchan Kim
2010-04-13 15:25 ` [PATCH 6/6] Add comment in alloc_pages_exact_node Minchan Kim
2010-04-13 16:13 ` Mel Gorman
2010-04-13 16:20 ` Minchan Kim
2010-04-13 15:32 ` [PATCH 1/6] Remove node's validity check in alloc_pages Mel Gorman
2010-04-14 0:04 ` KAMEZAWA Hiroyuki
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