[Devel] Re: [PATCH] Dynamically allocate struct mem_cgroup_stat_cpu memory

[KAMEZAWA Hiroyuki]

On Fri, 14 Nov 2008 11:52:41 +0800
Li Zefan <lizf at cn.fujitsu.com> wrote:

> CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu at jp.fujitsu.com>
> CC: Balbir Singh <balbir at linux.vnet.ibm.com>
> 
> Andrew Morton wrote:
> > (cc containers at lists.osdl.org)
> > 
> > On Thu, 13 Nov 2008 17:42:01 +0100 Jan Blunck <jblunck at suse.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.
> 
yes. but if you want to make changes minimum, just leave init_mem_cgroup.cpustat=NULL
and initialize it later. maybe not so difficult.


Thanks,
-Kame

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