linux-kernel - Re: [PATCH] Dynamically allocate struct mem_cgroup_stat

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Date:	Fri, 14 Nov 2008 11:52:41 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Jan Blunck <jblunck@...e.de>, containers@...ts.osdl.org,
	Linux-Kernel Mailinglist <linux-kernel@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: [PATCH] Dynamically allocate struct mem_cgroup_stat_cpu memory

CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC: Balbir Singh <balbir@...ux.vnet.ibm.com>

Andrew Morton wrote:
> (cc containers@...ts.osdl.org)
> 
> On Thu, 13 Nov 2008 17:42:01 +0100 Jan Blunck <jblunck@...e.de> wrote:
> 
>> When increasing NR_CPUS to 4096 the size of struct mem_cgroup is growing to
>> 507904 bytes per instance on x86_64. This patch changes the allocation of
>> struct mem_cgroup_stat_cpu to be based on the number of configured CPUs during
>> boot time. The init_mem_cgroup still is that huge since it stays statically
>> allocated and therefore uses the compile-time maximum.
>>

I think you can just remove init_mem_cgroup, because memcg doesn't require
early initialization (when kmalloc is not avaiable), and I found init_mem_cgroup
is not treated specially after greping 'init_mem_cgroup' in the code.


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