On Sun, Nov 22, 2020 at 08:11:52PM +1100, Balbir Singh wrote: > On Tue, Nov 17, 2020 at 06:19:34PM -0500, Joel Fernandes (Google) wrote: > > From: Peter Zijlstra <pet...@infradead.org> > > > > Introduce the basic infrastructure to have a core wide rq->lock. > > > > Reading through the patch, it seems like all the CPUs have to be > running with sched core enabled/disabled? Is it possible to have some > cores with core sched disabled?
Yep, patch even says so: + * XXX entirely possible to selectively enable cores, don't bother for now. > I don't see a strong use case for it, > but I am wondering if the design will fall apart if that assumption is > broken? The use-case I have is not using stop-machine. That is, stopping a whole core at a time, instead of the whole sodding machine. It's on the todo list *somewhere*....
