Messages in this thread | | | Subject | Re: [PATCH RFC 1/2] sched: Minimize the idle cpu selection race window. | From | Mike Galbraith <> | Date | Tue, 28 Nov 2017 11:49:11 +0100 |
| |
On Tue, 2017-11-28 at 10:34 +0100, Uladzislau Rezki wrote: > On Fri, Nov 24, 2017 at 07:46:30PM +0100, Mike Galbraith wrote: > > > My view is you're barking up the wrong tree: you're making the idle > > data SIS is using more accurate, but I question the benefit. That it > > makes an imperfect placement decision occasionally due to raciness is > > nearly meaningless compared to the cost of frequent bounce.
> Before sitting down and start testing, i just illustrated how we can > apply claim_wake_up to ilb asking community a specific view on it: > drawbacks, pros/cons, proposals etc.
Even if you make the thing atomic, what is ILB supposed to do, look over its shoulder every step of the way and sh*t it's pants if somebody touches claim_wake_up as it's about to or just after it did something?
If you intend to make all of LB race free, good luck.
-Mike
| |