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

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Message-ID: <20070725085552.GA22965@elte.hu>
Date:	Wed, 25 Jul 2007 10:55:52 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jeremy Fitzhardinge <jeremy@...p.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 <mingo@...e.hu> wrote:

> > Still isn't working.  I'm getting random meaningless softlockup 
> > trippings coming out for no apparent reason.
> 
> hm, you still havent applied the other 4 patches i sent:
> 
>  softlockup-fix.patch
> 
>  softlockup-add-irq-regs-h.patch
>  softlockup-better-printout.patch
>  softlockup-cleanups.patch
>  softlockup-use-cpu-clock.patch
> 
> they are all necessary.
> 
> softlockup-use-cpu-clock.patch could easily solve the present problem 
> you have: as i pointed it out it is _wrong_ to use sched_clock(), 
> because sched_clock() is not a reliable clocksource. Especially on 
> your VAIO.

note: the cpu_clock() API is in v2.6.23-rc1 already so the above patches 
work fine as-is.

[ for -stable, my other patch should be used that restores jiffies use
  in softirq.c. ]

	Ingo
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