Re: [RFC][PATCH 0/7] memcg async reclaim

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

On Thu, 12 May 2011 17:17:25 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:

> On Thu, 12 May 2011 13:22:37 +0900
> KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
> I'll check what codes in vmscan.c or /mm affects memcg and post a
> required fix in step by step. I think I found some..
> 

After some tests, I doubt that 'automatic' one is unnecessary until
memcg's dirty_ratio is supported. And as Andrew pointed out,
total cpu consumption is unchanged and I don't have workloads which
shows me meaningful speed up.
But I guess...with dirty_ratio, amount of dirty pages in memcg is
limited and background reclaim can work enough without noise of
write_page() while applications are throttled by dirty_ratio.

Hmm, I'll study for a while but it seems better to start active soft limit,
(or some threshold users can set) first. 

Anyway, this work makes me to see vmscan.c carefully and I think I can
post some patches for fix, tunes.

Thanks,
-Kame

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