From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Michal Hocko <mhocko@suse.cz>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2] memcg: update documentation to describe usage_in_bytes
Date: Tue, 29 Mar 2011 10:24:45 +0900 [thread overview]
Message-ID: <20110329102445.a46760ef.kamezawa.hiroyu@jp.fujitsu.com> (raw)
In-Reply-To: <20110329101511.d30f3518.nishimura@mxp.nes.nec.co.jp>
On Tue, 29 Mar 2011 10:15:11 +0900
Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> wrote:
> ===
> From: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
>
> 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>
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next prev parent reply other threads:[~2011-03-29 1:31 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-18 15:25 cgroup: real meaning of memory.usage_in_bytes Michal Hocko
2011-03-18 15:29 ` Michal Hocko
2011-03-21 9:34 ` Michal Hocko
2011-03-21 10:24 ` [PATCH] memcg: consider per-cpu stock reserves when returning RES_USAGE for _MEM Michal Hocko
2011-03-22 0:10 ` KAMEZAWA Hiroyuki
2011-03-22 1:47 ` Daisuke Nishimura
2011-03-22 7:31 ` Michal Hocko
2011-03-23 0:27 ` Daisuke Nishimura
2011-03-23 4:35 ` KAMEZAWA Hiroyuki
2011-03-27 23:55 ` Daisuke Nishimura
2011-03-28 4:25 ` [PATCH] memcg: update documentation to describe usage_in_bytes Daisuke Nishimura
2011-03-28 7:43 ` Michal Hocko
2011-03-28 9:11 ` KAMEZAWA Hiroyuki
2011-03-28 9:48 ` Michal Hocko
2011-03-28 10:31 ` KAMEZAWA Hiroyuki
2011-03-29 1:15 ` [PATCH v2] " Daisuke Nishimura
2011-03-29 1:24 ` KAMEZAWA Hiroyuki [this message]
2011-03-29 7:21 ` Michal Hocko
2011-04-19 12:14 ` Michal Hocko
2011-04-19 23:24 ` Daisuke Nishimura
2011-03-21 17:22 ` cgroup: real meaning of memory.usage_in_bytes Ying Han
2011-03-22 7:35 ` Michal Hocko
2011-03-22 17:06 ` Ying Han
2011-03-23 14:26 ` Michal Hocko
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