linux-kernel - Re: cgroup: status-quo and userland efforts

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Date:	Tue, 16 Apr 2013 19:17:17 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	<containers@...ts.linux-foundation.org>, <cgroups@...r.kernel.org>,
	<bsingharora@...il.com>, <dhaval.giani@...il.com>,
	Kay Sievers <kay.sievers@...y.org>, <jpoimboe@...hat.com>,
	<berrange@...hat.com>, <lpoetter@...hat.com>,
	<workman-devel@...hat.com>, <linux-kernel@...r.kernel.org>
Subject: Re: cgroup: status-quo and userland efforts

On 2013/4/6 9:21, Tejun Heo wrote:
> Hello, guys.
> 
>  Status-quo
>  ==========
> 
> It's been about a year since I wrote up a summary on cgroup status quo
> and future plans.  We're not there yet but much closer than we were
> before.  At least the locking and object life-time management aren't
> crazy anymore and most controllers now support proper hierarchy
> although not all of them agree on how to treat inheritance.
> 
> IIRC, the yet-to-be-converted ones are blk-throttle and perf.  cpu
> needs to be updated so that it at least supports a similar mechanism
> as cfq-iosched for configuring ratio between tasks on an internal
> cgroup and its children.  Also, we really should update how cpuset
> handles a cgroup becoming empty (no cpus or memory node left due to
> hot-unplug).  It currently transfers all its tasks to the nearest
> ancestor with executing resources, which is an irreversible process
> which would affect all other co-mounted controllers.  We probably want
> it to just take on the masks of the ancestor until its own executing
> resources become online again, and the new behavior should be gated
> behind a switch (Li, can you please look into this?).
> 

Sure, I'll be working on sane hierarchy behavior for cpuset.

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