linux-kernel - Re: [PATCH] cgroup: prefer [kv]zalloc over [kv]malloc+memset in memory controller code.

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Message-ID: <20101101200122.GH840@cmpxchg.org>
Date:	Mon, 1 Nov 2010 16:01:22 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Jesper Juhl <jj@...osbits.net>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	containers@...ts.linux-foundation.org
Subject: Re: [PATCH] cgroup: prefer [kv]zalloc over [kv]malloc+memset in
 memory controller code.

On Mon, Nov 01, 2010 at 08:40:56PM +0100, Jesper Juhl wrote:
> Hi (please CC me on replies),
> 
> 
> Apologies to those who receive this multiple times. I screwed up the To: 
> field in my original mail :-(
> 
> 
> In mem_cgroup_alloc() we currently do either kmalloc() or vmalloc() then 
> followed by memset() to zero the memory. This can be more efficiently 
> achieved by using kzalloc() and vzalloc().
> 
> 
> Signed-off-by: Jesper Juhl <jj@...osbits.net>

Looks good to me, but there is also the memset after kmalloc in
alloc_mem_cgroup_per_zone_info().  Can you switch that over as well in
this patch?  You can pass __GFP_ZERO to kmalloc_node() for zeroing.

Thanks!
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