linux-kernel - Re: [PATCH -tip 2/3] sched/wake

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Message-ID: <20150915124800.GB16853@twins.programming.kicks-ass.net>
Date:	Tue, 15 Sep 2015 14:48:00 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Davidlohr Bueso <dave@...olabs.net>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH -tip 2/3] sched/wake_q: Relax to acquire semantics

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.
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