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SubjectRe: [PATCH][2.5] Don't schedule tasks on offline cpus

On Mon, 17 Feb 2003, Zwane Mwaikambo wrote:

> We don't want to allow a cpu going offline to keep doing scheduler work
> so let it exit early, otherwise we'd keep pulling in tasks every timer
> tick.

i'd rather have all the hotplug CPU code to do this kind of stuff
completely out of line. Start up a max-RT-priority housekeeping task and
just clean the runqueue and deregister the CPU in one atomic pass - look
at how the migration threads do similar stuff. No need to contaminate
various codepaths with 'is this CPU online' checks.

Ingo

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