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Re: [PATCH] task containersv11 add tasks file interface fix for cpusets

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From: Paul Menage <menage@...>
To: Paul Jackson <pj@...>
Cc: <akpm@...>, <nickpiggin@...>, <a.p.zijlstra@...>, <serue@...>, <clg@...>, <linux-kernel@...>, <ebiederm@...>, <rientjes@...>, <svaidy@...>, <xemul@...>, <containers@...>, <balbir@...>
Subject: Re: [PATCH] task containersv11 add tasks file interface fix for cpusets
Date: Wednesday, October 3, 2007 - 2:10 pm

On 10/3/07, Paul Jackson <pj@sgi.com> wrote:

What's the rationale for this?

Given that later in cpusets.txt you say:


why can't the same thing be done when changing the 'cpus' file manually.

What's wrong with, in update_cpumask(), doing a loop across all
members of the cgroup and updating their cpus_allowed fields?

The existing cpusets API is broken, since a new child can always be
forked between reading the tasks file and doing the writes.

Paul
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Messages in current thread:
[PATCH] task containersv11 add tasks file interface fix for ..., Paul Jackson, (Wed Oct 3, 4:42 am)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Jackson, (Wed Oct 3, 4:56 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Menage, (Wed Oct 3, 11:51 am)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Jackson, (Wed Oct 3, 1:58 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Menage, (Wed Oct 3, 2:10 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Jackson, (Wed Oct 3, 4:16 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Menage, (Wed Oct 3, 4:31 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Jackson, (Sat Oct 6, 4:24 am)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Menage, (Sat Oct 6, 4:53 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., David Rientjes, (Sat Oct 6, 1:54 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Menage, (Sat Oct 6, 5:11 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., David Rientjes, (Sun Oct 7, 2:15 am)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Menage, (Wed Oct 10, 4:46 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., David Rientjes, (Wed Oct 10, 4:59 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Jackson, (Thu Oct 11, 7:15 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., David Rientjes, (Fri Oct 12, 11:13 am)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Jackson, (Sat Oct 6, 3:59 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., David Rientjes, (Sun Oct 7, 2:13 am)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Menage, (Sat Oct 6, 5:09 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Jackson, (Thu Oct 11, 6:03 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Eric W. Biederman, (Thu Oct 11, 7:20 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Jackson, (Thu Oct 11, 9:23 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Jackson, (Sat Oct 6, 5:41 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Jackson, (Wed Oct 3, 4:52 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Menage, (Wed Oct 3, 4:58 pm)
Re: [PATCH] task containersv11 add tasks file interface fix ..., Paul Menage, (Wed Oct 3, 2:25 pm)