On Tue, 29 Mar 2011 10:15:11 +0900
Daisuke Nishimura [off-list ref] wrote:

===
From: Daisuke Nishimura <redacted>

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 <redacted>

Acked-by: KAMEZAWA Hiroyuki <redacted>

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