linux-kernel - Re: [RFC][PATCH 4/4] cgroup-memcg fix frequent EBUSY at rmdir

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Message-Id: <20090114121205.1bb913aa.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 14 Jan 2009 12:12:05 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Paul Menage <menage@...gle.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>
Subject: Re: [RFC][PATCH 4/4] cgroup-memcg fix frequent EBUSY at rmdir

On Tue, 13 Jan 2009 19:05:35 -0800
Paul Menage <menage@...gle.com> wrote:

> On Tue, Jan 13, 2009 at 7:00 PM, KAMEZAWA Hiroyuki
> <kamezawa.hiroyu@...fujitsu.com> wrote:
> >
> > Hmm, add wait_queue to css and wake it up at css_put() ?
> >
> > like this ?
> > ==
> > __css_put()
> > {
> >        if (atomi_dec_return(&css->refcnt) == 1) {
> >                if (notify_on_release(cgrp) {
> >                        .....
> >                }
> >                if (someone_waiting_rmdir(css)) {
> >                        wake_up_him().
> >                }
> >        }
> > }
> 
> Yes, something like that. A system-wide wake queue is probably fine though.
> 
Ok, I'll try that.

-Kame

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