linux-kernel - Re: [FIX][PATCH 6/7] cgroup/memcg: fix frequent -EBUSY at rmdir

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Message-Id: <20090126165823.dcf9cf78.randy.dunlap@oracle.com>
Date:	Mon, 26 Jan 2009 16:58:23 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"menage@...gle.com" <menage@...gle.com>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [FIX][PATCH 6/7] cgroup/memcg: fix frequent -EBUSY at rmdir

On Thu, 22 Jan 2009 18:40:18 +0900 KAMEZAWA Hiroyuki wrote:

>  Documentation/cgroups/cgroups.txt |    6 +-
>  include/linux/cgroup.h            |   16 +-----
>  kernel/cgroup.c                   |   97 ++++++++++++++++++++++++++++++++------
>  mm/memcontrol.c                   |    5 +
>  4 files changed, 93 insertions(+), 31 deletions(-)
> 
> Index: mmotm-2.6.29-Jan16/Documentation/cgroups/cgroups.txt
> ===================================================================
> --- mmotm-2.6.29-Jan16.orig/Documentation/cgroups/cgroups.txt
> +++ mmotm-2.6.29-Jan16/Documentation/cgroups/cgroups.txt
> @@ -478,11 +478,13 @@ cgroup->parent is still valid. (Note - c
>  newly-created cgroup if an error occurs after this subsystem's
>  create() method has been called for the new cgroup).
>  
> -void pre_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp);
> +int pre_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp);
>  
>  Called before checking the reference count on each subsystem. This may
>  be useful for subsystems which have some extra references even if
> -there are not tasks in the cgroup.
> +there are not tasks in the cgroup. If pre_destroy() returns error code,
> +rmdir() will fail with it. From this behavior, pre_destroy() can be
> +called plural times against a cgroup.

s/plural/multiple/ please.

>  
>  int can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
>  	       struct task_struct *task)


---
~Randy
--
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