linux-kernel - Re: [RFC][PATCH 2/5] memcg: uncharge in batched manner

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Message-ID: <20090831122316.GM4770@balbir.in.ibm.com>
Date:	Mon, 31 Aug 2009 17:53:16 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"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 2/5] memcg: uncharge in batched manner

* KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2009-08-31 21:14:10]:

> Balbir Singh wrote:
> >> > Does this effect deleting of a group and delay it by a large amount?
> >> >
> >> plz see what cgroup_release_and_xxxx  fixed. This is not for delay
> >> but for race-condition, which makes rmdir sleep permanently.
> >>
> >
> > I've seen those patches, where rmdir() can hang. My conern was time
> > elapsed since we do css_get() and do a cgroup_release_and_wake_rmdir()
> >
> plz read unmap() and truncate() code.
> The number of pages handled without cond_resched() is limited.
> 
>

I understand that part, I was referring to tasks stuck doing rmdir()
while we do batched uncharge, will it be very visible to the end user?
cond_resched() is bad in this case.. since it means we'll stay longer
before we release the cgroup.
 

-- 
	Balbir
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