linux-kernel - Re: [PATCHSET] cgroup: cftype based file interface, take #2

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Message-ID: <20120330154246.GE28934@google.com>
Date:	Fri, 30 Mar 2012 08:42:46 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	glommer@...allels.com, lizf@...fujitsu.com,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, fweisbec@...il.com, rni@...gle.com,
	ctalbott@...gle.com
Subject: Re: [PATCHSET] cgroup: cftype based file interface, take #2

Hey, Li.

On Fri, Mar 30, 2012 at 08:42:07PM +0800, Li Zefan wrote:
> > This patch replaces cgroup file interface with cftype based one which
> > allows dynamic additions and removals of cftype arrays whether the
> > target subsystem is attached or not.  This can be used to make subsys
> > rebinding via remount work properly but I intentionally avoided doing
> > that at the moment.
> 
> What's the problem with remount?

Subsys can't be changed if any non-root cgroup exists.

> and is it important enough that it should be fixed even the feature
> is marked as deprecated?

I'm not sure.  We *might* need it during multi-mount -> single-mount
transition depending on how that's implemented, so the "at the moment"
qualifier.  It probably won't be fixed but I'm not fully sure.

> > This makes cgroup population simpler for controllers and will be used
> > to allow controllers to be more dynamic.  e.g. blkio subsys has
> > sub-policies which may come and go while blkio subsys is attached and
> > it currently uses fixed set of files which stays blank if not in use.
> 
> Dynamic cgroup files was mentioned before. The scenario in mind was blkio
> control files can be added/removed automatically as devices come and ago.
> 
> So this time blkio subsystem is really going to be made more dynamic
> soon?

Patchset already posted.

  http://thread.gmane.org/gmane.linux.kernel.cgroups/1376

Thanks.

-- 
tejun
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