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

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From: Eric W. Biederman <ebiederm@...>
To: Paul Jackson <pj@...>
Cc: Paul Menage <menage@...>, <rientjes@...>, <akpm@...>, <nickpiggin@...>, <a.p.zijlstra@...>, <serue@...>, <clg@...>, <linux-kernel@...>, <svaidy@...>, <xemul@...>, <containers@...>, <balbir@...>
Subject: Re: [PATCH] task containersv11 add tasks file interface fix for cpusets
Date: Thursday, October 11, 2007 - 7:20 pm

Stupid question.

Would it help at all if we structured this as:
- Take the control group off of the cpus and runqueues.
- Modify the tasks in the control group.
- Place the control group back on the runqueues.

Essentially this is what ptrace does (except for one task at a time).

Since we know that the tasks are not running, and that we have
exclusive access to the tasks in the control group we can take action
as if we were the actual tasks themselves.  Which should simplify
locking.

So I think with just a touch of care we can significantly simplify the
locking by being much more coarse grained, at the expense of this kind
of control group operation being more expensive.  Plus we would have
an operation that was reusable.

I think the stop everything.  modify everything, start everything
could also be used instead of an array of task structures.

Eric
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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)