On Sat, 27 Jan 2007 01:16:22 +0530
Dipankar Sarma <[email protected]> wrote:
> > The plan is, I hope, to rip it all out and do freeze_processes() on the
> > hotplug side, so nobody else needs to worry about cpu hotplug any more.
> > But at present everyone seems to be in hiding.
>
> This would be ideal. However, we don't seem to have any momentum
> on this.
There's no point in expending effort on a fancy new lock until this option
has been eliminated, so yeah, things are stuck.
> The other thing we would need to do in this case is to
> check if all the users of cpu hotplug can tolerate a very slow
> hotplug step if there are 10s of thousands of processes and threads.
Yes, that needs evaluation. If it's a problem then we might need to
introduce a more sophisticated user interface which enables userspace to
take multiple CPUs online and offline in a single step, rather than
one-at-a-time. I expect that'd be fairly straightforward.
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