Re: [PATCH v2] memcg: update documentation to describeusage_in_bytes

[KAMEZAWA Hiroyuki]

On Tue, 29 Mar 2011 10:15:11 +0900
Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx> wrote:

> ===
> From: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>
> 
> Since 569b846d(memcg: coalesce uncharge during unmap/truncate), we do batched
> (delayed) uncharge at truncation/unmap. And since cdec2e42(memcg: coalesce
> charging via percpu storage), we have percpu cache for res_counter.
> 
> These changes improved performance of memory cgroup very much, but made
> res_counter->usage usually have a bigger value than the actual value of memory usage.
> So, *.usage_in_bytes, which show res_counter->usage, are not desirable for precise
> values of memory(and swap) usage anymore.
> 
> Instead of removing these files completely(because we cannot know res_counter->usage
> without them), this patch updates the meaning of those files.
> 
> Signed-off-by: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>

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