Messages in this thread | | | Date | Tue, 24 Nov 2020 09:16:17 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH -tip 04/32] sched: Core-wide rq->lock |
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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 <peterz@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*....
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