From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Andi Kleen <ak@suse.de>
Subject: Re: [discuss] Re: 2.6.15-rc5-mm1 (x86_64-hpet-overflow.patch breaks resume from disk)
Date: Fri, 9 Dec 2005 00:00:21 +0100
User-Agent: KMail/1.9
Cc: Jan Beulich <JBeulich@novell.com>, Andrew Morton <akpm@osdl.org>,
       linux-kernel@vger.kernel.org, Discuss x86-64 <discuss@x86-64.org>
References: <20051204232153.258cd554.akpm@osdl.org> <43980058.76F0.0078.0@novell.com> <20051208224735.GV11190@wotan.suse.de>
In-Reply-To: <20051208224735.GV11190@wotan.suse.de>
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Hi,

On Thursday, 8 December 2005 23:47, Andi Kleen wrote:
> On Thu, Dec 08, 2005 at 09:43:52AM +0100, Jan Beulich wrote:
> > I don't know how resume normally handles the re-syncing of the wall
> > clock, but the problem here is obvious: do_timer runs a loop to
> > increment jiffies, which may require significant amounts of time
> > (depending how long the system was sleeping).
> 
> It would be good if someone could submit a patch to fix
> this up properly. It indeed sounds wrong.

Well, timer_resume() does adjust jiffies and wall_jiffies.

The problem seems to be that vxtime.last and/or vxtime.last_tsc are not
adjusted by it which makes the timer interrupt handler unhappy (with the
hpet-overflow patch applied, that is).

Greetings,
Rafael


-- 
Beer is proof that God loves us and wants us to be happy - Benjamin Franklin
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