linux-kernel - Re: [PATCH 3/6] change alloc function in alloc_slab

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Message-ID: <i2x28c262361004130901p9c34b49cu9c7ebd1a24de5ed9@mail.gmail.com>
Date:	Wed, 14 Apr 2010 01:01:31 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Bob Liu <lliubbo@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [PATCH 3/6] change alloc function in alloc_slab_page

On Wed, Apr 14, 2010 at 12:52 AM, Mel Gorman <mel@....ul.ie> wrote:
> On Wed, Apr 14, 2010 at 12:25:00AM +0900, Minchan Kim wrote:
>> alloc_slab_page never calls alloc_pages_node with -1.
>
> Are you certain? What about
>
> __kmalloc
>  -> slab_alloc (passed -1 as a node from __kmalloc)
>    -> __slab_alloc
>      -> new_slab
>        -> allocate_slab
>          -> alloc_slab_page
>

Sorry for writing confusing changelog.

I means if node == -1 alloc_slab_page always calls alloc_pages.
So we don't need redundant check.

-- 
Kind regards,
Minchan Kim
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