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| author | Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> | 2011-04-27 15:26:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-04-28 11:28:21 -0700 |
| commit | a111c966a65e4b5d9c6fd2d8459978c1407077d5 (patch) | |
| tree | 00deb8e67fff61c8e234ad048a7534f9129c618d /mm | |
| parent | 98909cf0d125eb0110afe92d0b419be7fa097f78 (diff) | |
| download | linux-a111c966a65e4b5d9c6fd2d8459978c1407077d5.tar.bz2 | |
memcg: update documentation to describe usage_in_bytes
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@mxp.nes.nec.co.jp>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions