Message-ID: <471DA974.8060509@linux.vnet.ibm.com>
Date: Tue, 23 Oct 2007 13:27:40 +0530
From: Balbir Singh <balbir@linux.vnet.ibm.com>
Reply-To: balbir@linux.vnet.ibm.com
Organization: IBM
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To: Paul Menage <menage@google.com>
CC: vatsa@linux.vnet.ibm.com, containers@lists.linux-foundation.org,
       Andrew Morton <akpm@linux-foundation.org>, Ingo Molnar <mingo@elte.hu>,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] CFS CGroup: Report usage
References: <471D4523.4040509@google.com> <20071023024036.GC3324@linux.vnet.ibm.com> <6599ad830710222306m6a3e3f52k4daf501836c05274@mail.gmail.com> <6599ad830710230021n536908c0xd95250f36aa8a27d@mail.gmail.com> <471DA78F.4090600@linux.vnet.ibm.com> <6599ad830710230053l35fffaf5ld8882eaae8b9df7c@mail.gmail.com>
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Paul Menage wrote:
> On 10/23/07, Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
>> Well, most people who care about deletion will use the notify_on_release
>> callback and retry.
> 
> I'm not convinced this is true. Certainly the userspace approaches
> we're developing at Google don't (currently) use notify_on_release.
> 
> Paul

Well, without notify_on_release you can never be sure if a new task
got added to the control group or if someone acquired a reference
to it. I can't think of a safe way of removing control groups/cpusets
without using notify_on_release.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL

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