linux-kernel - Re: [patch] fix the softlockup watchdog to actually work

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Date:	Thu, 19 Jul 2007 07:31:11 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	stable@...nel.org, Greg KH <greg@...ah.com>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [patch] fix the softlockup watchdog to actually work

Ingo Molnar wrote:
> btw., could you apply the patch below as well? Maybe sched_clock() is 
> misbehaving on your box? (with this i have 5 softlockup patches in my 
> tree - and they are working fine so far.)
>
> 	Ingo
>
> ---------------->
> Subject: [patch] softlockup: use a reliable global time source
> From: Ingo Molnar <mingo@...e.hu>
>
> using sched_clock() for the soft-lockups was a bad idea, sched_clock()
> is not a reliable global time-source.
>   

How reliable does it need to be?  All we need is to measure "about 10
seconds"; if we can't get that out of it, how can it be good for
anything else?

    J
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