linux-kernel - Re: [PATCH] memcg: use ID in page

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Message-Id: <20100824101425.2dc25773.nishimura@mxp.nes.nec.co.jp>
Date:	Tue, 24 Aug 2010 10:14:25 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-mm@...ck.org,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	gthelen@...gle.com, m-ikeda@...jp.nec.com,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kamezawa.hiroyuki@...il.com,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH] memcg: use ID in page_cgroup

> > > @@ -723,6 +729,11 @@ static inline bool mem_cgroup_is_root(st
> > >  	return (mem == root_mem_cgroup);
> > >  }
> > >  
> > > +static inline bool mem_cgroup_is_rootid(unsigned short id)
> > > +{
> > > +	return (id == 1);
> > > +}
> > > +
> > It might be better to add
> > 
> > 	BUG_ON(newid->id != 1)
> > 
> > in cgroup.c::cgroup_init_idr().
> > 
> 
> Why ??
> 
Just to make sure that the root css has id==1. mem_cgroup_is_rootid() make
use of the fact.
I'm sorry if I miss something.

Thanks,
Daisuke Nishimura.
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