Re: [CFT][RFC] HT scheduler

Jamie Lokier
2003-12-14T04:33:07Z

Nick Piggin wrote:
> >Shared runqueues sound like a simplification to describe execution units
> >which have shared resourses and null cost of changing units. You can do
> >that by having a domain which behaved like that, but a shared runqueue
> >sounds better because it would eliminate the cost of even considering
> >moving a process from one sibling to another.
>
> You are correct, however it would be a miniscule cost advantage,
> possibly outweighed by the shared lock, and overhead of more
> changing of CPUs (I'm sure there would be some cost).

Regarding the overhead of the shared runqueue lock:

Is the "lock" prefix actually required for locking between x86
siblings which share the same L1 cache?

-- Jaime