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Date: Mon, 5 May 2014 16:58:15 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Frederic Weisbecker <fweisbec@...il.com>
Cc: linux-kernel@...r.kernel.org, mingo@...nel.org, hpa@...or.com,
paulmck@...ux.vnet.ibm.com, akpm@...ux-foundation.org,
khilman@...aro.org, tglx@...utronix.de, axboe@...com,
linux-tip-commits@...r.kernel.org
Subject: Re: [tip:timers/nohz] nohz: Move full nohz kick to its own IPI
On Mon, May 05, 2014 at 04:52:59PM +0200, Frederic Weisbecker wrote:
> > Should we instead do irq_work_queue_on() ?
>
> I would really much prefer that yeah. But if we do that, expect some added overhead on the local
> irq_work_queue() path though. irq_work_raise can't use local cmpxchg ops anymore.
>
> Or we can have a different pending raise system for remote irq work.
>
> I can try something.
Loosing that local cmpxchg shouldn't be a problem, I don't thnk this is
a particularly hot path.
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