linux-kernel - Re: [RFC][PATCH 3/3] CGroups: Add css

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Message-Id: <20081211162937.2829e625.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 11 Dec 2008 16:29:37 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Paul Menage <menage@...gle.com>
Cc:	balbir@...ux.vnet.ibm.com, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [RFC][PATCH 3/3] CGroups: Add css_tryget()

On Wed, 10 Dec 2008 23:28:12 -0800
Paul Menage <menage@...gle.com> wrote:

> On Wed, Dec 10, 2008 at 9:15 PM, KAMEZAWA Hiroyuki
> <kamezawa.hiroyu@...fujitsu.com> wrote:
> >
> > Could you add this ?
> > ==
> > bool    css_is_removed(struct cgroup_subsys_state *css)
> > {
> >        return test_bit(CSS_REMOVED, &css->flags);
> > }
> > ==
> > Then, I'll use this instead of memcg->obsolete flag.
> 
> I actually had a patch almost ready to send out the nuked memcg->obsolete.
> 
> A difference in mine is that I did
> 
> #define css_is_removed(__css) test_bit(CSS_REMOVED, &(__css)->css.flags)
> 
> so that you can use it on any subsystem state object that contains a
> "struct cgroup_subsys_state css;" field, which is currently all of
> them I think, without having to add the "->css" every time.
> 
ok, thx. very useful :)

-Kame

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