linux-kernel - Re: [RFC][PATCH] memcg: show real limit under hierarchy

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Date:	Fri, 12 Dec 2008 10:24:13 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Balbir Singh" <balbir@...ux.vnet.ibm.com>
Cc:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>
Subject: Re: [RFC][PATCH] memcg: show real limit under hierarchy

On Thu, 11 Dec 2008 19:30:46 +0530
"Balbir Singh" <balbir@...ux.vnet.ibm.com> wrote:

> On Thu, Dec 11, 2008 at 8:54 AM, KOSAKI Motohiro
> <kosaki.motohiro@...fujitsu.com> wrote:
> >> I wonder other people who debugs memcg's hierarchy may use similar patches.
> >> this is my one.
> >> comments ?
> >> ==
> >> From:KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> >>
> >> Show "real" limit of memcg.
> >> This helps my debugging and maybe useful for users.
> >>
> >> While testing hierarchy like this
> >>
> >>       mount -t cgroup none /cgroup -t memory
> >>       mkdir /cgroup/A
> >>       set use_hierarchy==1 to "A"
> >>       mkdir /cgroup/A/01
> >>       mkdir /cgroup/A/01/02
> >>       mkdir /cgroup/A/01/03
> >>       mkdir /cgroup/A/01/03/04
> >>       mkdir /cgroup/A/08
> >>       mkdir /cgroup/A/08/01
> >>       ....
> >> and set each own limit to them, "real" limit of each memcg is unclear.
> >> This patch shows real limit by checking all ancestors in memory.stat.
> >>
> >> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> >
> > Great!
> >
> > I hoped to use this patch at hierarchy inactive_ratio debugging ;)
> 
> I like this very much too
> 
> I would prefer to use
> 
> min_limit = min(tmp, min_limit); and similarly for min_memsw_limit
> 
> Acked-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
> 
Thanks, I'll upadte this and forward to Andrew.

-Kame


> Balbir
> 

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