linux-kernel - Re: Rough notes from sys_membarrier() lightning BoF

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Message-ID: <20170922093329.wizest62uolktwc7@hirez.programming.kicks-ass.net>
Date:   Fri, 22 Sep 2017 11:33:29 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     James Bottomley <James.Bottomley@...senPartnership.com>
Cc:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Andy Lutomirski <luto@...nel.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Will Deacon <will.deacon@....com>,
        Alan Stern <stern@...land.harvard.edu>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Dave Watson <davejwatson@...com>,
        maged michael <maged.michael@...il.com>
Subject: Re: Rough notes from sys_membarrier() lightning BoF

On Thu, Sep 21, 2017 at 10:23:39AM -0700, James Bottomley wrote:

>  We have one system that locks up if
> multiple CPUs have outstanding coherency operations on the private bus,
> but that's only one annoying CPU (which we manage with a special lock
> inside the PA-RISC mmu code).

Hehe, yeah. I saw that code recently and had a WTF moment ;-)