linux-kernel - Re: [PATCH 08/14] hrtimer: Allow hrtimer::function() to free the timer

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Date:	Wed, 10 Jun 2015 08:55:06 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	umgwanakikbuti@...il.com, mingo@...e.hu, ktkhai@...allels.com,
	rostedt@...dmis.org, tglx@...utronix.de, juri.lelli@...il.com,
	pang.xunlei@...aro.org, wanpeng.li@...ux.intel.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/14] hrtimer: Allow hrtimer::function() to free the
 timer

On Tue, 2015-06-09 at 23:33 +0200, Oleg Nesterov wrote:
> 
> Yes, but wmb() is cheap on x86... Perhaps we can make this code
> "obviously correct" ?

I'll reply to the rest a bit later; got to run some errands first.

The 'problem' of course is ARM/PPC etc.. we would like to keep this
generic code fast, even for the loosely ordered machines.

And wmb() is certainly not cheap for them; although not as bad as a full
barrier.
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