linux-kernel - Re: Question for remount

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Date:	Tue, 24 Feb 2009 10:47:51 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	menage@...gle.com, containers@...ts.linux-foundation.org
Subject: Re: Question for remount

On Tue, 24 Feb 2009 09:41:28 +0800
Li Zefan <lizf@...fujitsu.com> wrote:

> >>  To change the set of subsystems bound to a mounted hierarchy, just
> >>  remount with different options:
> >> +# mount -o remount,cpuset,ns hier1 /dev/cgroup
> >>  
> >> -# mount -o remount,cpuset,ns  /dev/cgroup
> >> +Now numtasks is removed from the hierarchy and ns is added.
> >> +
> >> +Note this will add ns to the hierarchy but won't remove numtasks or
> >> +cpuset:
> >> +# mount -o remount,ns /dev/cgroup
> >>  
> > 
> > Just a question. What is "numtasks" here ? We have numtasks cgroup ?
> > 
> 
> No, I guess that's a proposed but not implemented cgroup subsystem. :)
> And I can change it to an existing one.
> 
O.K. thanks.

BTW, how about writing this kind of text in explicit way ?
+Note: this will add ns to the hierarchy but won't remove numtasks or
+cpuset because new options is appended to old options. If you want to
+override, please use.....

-Kame

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