linux-kernel - Re: task isolation discussion at Linux Plumbers

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Message-ID: <20161107191624.GL20591@arm.com>
Date:   Mon, 7 Nov 2016 19:16:24 +0000
From:   Will Deacon <will.deacon@....com>
To:     Rik van Riel <riel@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Gilad Ben Yossef <giladb@...lanox.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Christoph Lameter <cl@...ux.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Andy Lutomirski <luto@...capital.net>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Francis Giraldeau <francis.giraldeau@...il.com>,
        Andi Kleen <andi@...stfloor.org>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: Re: task isolation discussion at Linux Plumbers

On Mon, Nov 07, 2016 at 02:12:13PM -0500, Rik van Riel wrote:
> On Mon, 2016-11-07 at 19:36 +0100, Thomas Gleixner wrote:
> > On Mon, 7 Nov 2016, Thomas Gleixner wrote:
> > > 
> > > > 
> > > > == Missing oneshot_stopped callbacks ==
> > > > 
> > > > I raised the issue that various clock_event_device sources don't
> > > > always support oneshot_stopped, which can cause an additional
> > > > final interrupt to occur after the timer infrastructure believes
> > > > the
> > > > interrupt has been stopped.  I have patches to fix this for tile
> > > > and
> > > > arm64 in my patch series; Thomas volunteered to look at adding
> > > > equivalent support for x86.
> > > 
> > > Right.
> > 
> > Untested patch below should fix that.
> > 
> 
> That whitespace cleanup looks awesome, but I am not
> optimistic about its chances to bring about functional
> change.
> 
> What am I overlooking?

It hooks up .set_state_oneshot_stopped?

Will