linux-kernel - Re: [patch 1/2] Ignore stolen time in the softlockup watchdog

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Message-id: <4608C121.4050309@cosmosbay.com>
Date:	Tue, 27 Mar 2007 09:00:49 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	virtualization@...ts.osdl.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	john stultz <johnstul@...ibm.com>,
	Zachary Amsden <zach@...are.com>,
	James Morris <jmorris@...ei.org>,
	Dan Hecht <dhecht@...are.com>,
	Paul Mackerras <paulus@...ba.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Prarit Bhargava <prarit@...hat.com>,
	Chris Lalancette <clalance@...hat.com>,
	Rick Lindsley <ricklind@...ibm.com>
Subject: Re: [patch 1/2] Ignore stolen time in the softlockup watchdog

Jeremy Fitzhardinge a écrit :

> +static DEFINE_PER_CPU(unsigned long long, touch_timestamp);

...

>  void touch_softlockup_watchdog(void)
>  {
> -	__raw_get_cpu_var(touch_timestamp) = jiffies;
> +	__raw_get_cpu_var(touch_timestamp) = sched_clock();
>  }

Not very clear if this is safe on 32bit, since this is not anymore atomic.

Maybe a comment would help ?


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