linux-kernel - Re: [RFC][PATCH 1/3] CGroups: Add a per-subsystem hierarchy

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Message-ID: <6599ad830812110909t5e268bcak31df359c516874d1@mail.gmail.com>
Date:	Thu, 11 Dec 2008 09:09:15 -0800
From:	Paul Menage <menage@...gle.com>
To:	balbir@...ux.vnet.ibm.com, menage@...gle.com,
	kamezawa.hiroyu@...fujitsu.com,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [RFC][PATCH 1/3] CGroups: Add a per-subsystem hierarchy_mutex

On Wed, Dec 10, 2008 at 10:29 PM, Balbir Singh
<balbir@...ux.vnet.ibm.com> wrote:
>
> Seems reasonable, I was wondering if instead of acquiring a mutex per
> subsystem that shares the root, if we can collapse it to a single
> mutex and prevent cgroup from changing binding. Those are
> optimizations that we can think of later

You mean a single hierarchy_mutex per root? But given that one of the
things being protected is which root you're attached to, if you're
trying to prevent hierarchy changes then which root's hierarchy_mutex
would you lock?

Paul
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