linux-kernel - Re: [stable] 2.6.32.21 - uptime related crashes?

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Message-Id: <20110430090805.354484ad.rdunlap@xenotime.net>
Date:	Sat, 30 Apr 2011 09:08:05 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Greg KH <greg@...ah.com>
Cc:	Nikola Ciprich <nikola.ciprich@...uxbox.cz>,
	Willy Tarreau <w@....eu>, seto.hidetoshi@...fujitsu.com,
	Hervé Commowick <hcommowick@...sec.fr>,
	linux-kernel mlist <linux-kernel@...r.kernel.org>,
	linux-stable mlist <stable@...nel.org>
Subject: Re: [stable] 2.6.32.21 - uptime related crashes?

On Sat, 30 Apr 2011 08:57:07 -0700 Greg KH wrote:

> On Sat, Apr 30, 2011 at 02:02:05PM +0200, Nikola Ciprich wrote:
> > > There was a kernel parameter in the past that was used to make jiffies wrap
> > > a few minutes after boot, maybe we should revive it to try to reproduce
> > > without waiting 7 new months :-/
> > hmm, I've googled this up, and it seems to have been 2.5.x patch, so it will
> > certainly need some porting..
> > I'll try to have a look on it tonight and report...
> 
> I don't think any patch is needed, I thought we did that by default now,
> but I can't seem to find the code where it happens...
> 
> odd.

linux/jiffies.h:

/*
 * Have the 32 bit jiffies value wrap 5 minutes after boot
 * so jiffies wrap bugs show up earlier.
 */
#define INITIAL_JIFFIES ((unsigned long)(unsigned int) (-300*HZ))


and kernel/timer.c:

u64 jiffies_64 __cacheline_aligned_in_smp = INITIAL_JIFFIES;


---
~Randy
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