Messages in this thread | | | Date | Wed, 20 Feb 2002 17:40:56 -0800 | From | Kimio Suganuma <> | Subject | Re: [Lse-tech] Re: [PATCH] O(1) scheduler set_cpus_allowed for non-current tasks |
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Hi all,
On Wed, 20 Feb 2002 17:12:21 -0800 Paul Jackson <pj@engr.sgi.com> wrote:
> > Another problem is the right moment to change the cpu field of the > > task. ... The IPI to the target CPU is the same as in the > > initial design of Ingo. It has to wait for the task to unschedule and > > knows it will find it dequeued. > > How about not changing anything of the target task synchronously, > except for some new "proposed_cpus_allowed" field. Set that > field and get out of there. Let the target process run the > set_cpus_allowed() routine on itself, next time it passes through > the schedule() code. Leave it the case that the set_cpus_allowed() > routine can only be run on the current process. > > Perhaps others need this cpus_allowed change (and the migration > of a task to a different allowed cpu) to happen "right away". > But I don't, and I don't (yet) know that anyone else does.
CPU hotplug needs to change cpus_allowed in definite time. When a process is sleeping for 100000 seconds, how can we offline a CPU the process belongs?
Regards, Kimi
-- Kimio Suganuma <k-suganuma@mvj.biglobe.ne.jp>
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