Messages in this thread | | | Date | Tue, 15 Sep 2015 07:09:22 -0700 | From | "Paul E. McKenney" <> | Subject | Re: [PATCH -tip 2/3] sched/wake_q: Relax to acquire semantics |
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On Tue, Sep 15, 2015 at 02:48:00PM +0200, Peter Zijlstra wrote: > On Tue, Sep 15, 2015 at 05:41:42AM -0700, Paul E. McKenney wrote: > > > Never mind, the PPC people will implement this with lwsync and that is > > > very much not transitive IIRC. > > > > I am probably lost on context, but... > > > > It turns out that lwsync is transitive in special cases. One of them > > is a series of release-acquire pairs, which can extend indefinitely. > > > > Does that help in this case? > > Probably not, but good to know. I still don't think we want to rely on > ACQUIRE/RELEASE being transitive in general though.
OK, I will bite... Why not?
Thanx, Paul
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