linux-kernel - Re: [PATCH] Add cgroup support for enabling controllers at boot time

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Message-ID: <alpine.DEB.1.00.0803062115010.26462@chino.kir.corp.google.com>
Date:	Thu, 6 Mar 2008 21:15:33 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	balbir@...ux.vnet.ibm.com, Paul Menage <menage@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelianov <xemul@...nvz.org>,
	Hugh Dickins <hugh@...itas.com>,
	Sudhir Kumar <skumar@...ux.vnet.ibm.com>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org, taka@...inux.co.jp,
	linux-mm@...ck.org
Subject: Re: [PATCH] Add cgroup support for enabling controllers at boot
 time

On Fri, 7 Mar 2008, KAMEZAWA Hiroyuki wrote:

> > David Rientjes wrote:
> > > On Fri, 7 Mar 2008, Balbir Singh wrote:
> > > 
> > >> @@ -3010,3 +3020,16 @@ static void cgroup_release_agent(struct 
> > >>  	spin_unlock(&release_list_lock);
> > >>  	mutex_unlock(&cgroup_mutex);
> > >>  }
> > >> +
> > >> +static int __init cgroup_disable(char *str)
> > >> +{
> > >> +	int i;
> > >> +	for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
> > >> +		struct cgroup_subsys *ss = subsys[i];
> > >> +		if (!strcmp(str, ss->name)) {
> > >> +			ss->disabled = 1;
> > >> +			break;
> > >> +		}
> > >> +	}
> > >> +}
> > >> +__setup("cgroup_disable=", cgroup_disable);
> > > 
> > > This doesn't handle spaces very well, so isn't it possible for the name of 
> > > a current or future cgroup subsystem to be specified after cgroup_disable= 
> > > on the command line and have it disabled by accident?
> > > 
> > 
> Hmm, cmdline like
> 
> cgroup_disable=cpu,memory, ...
> 
> should be written as
> 
> cgroup_disable=cpu cgroup_disable=memory ....
> 

Or just set the first space following cgroup_disable= to '\0' and you're 
done.  strcmp() will take care of the rest.
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