linux-kernel - Re: [PATCH] fix jiffy calculations in calibrate_delay

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Message-Id: <4D52A241020000780003107A@vpn.id2.novell.com>
Date:	Wed, 09 Feb 2011 13:18:41 +0000
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"Jiri Slaby" <jslaby@...e.cz>
Cc:	"Tim Deegan" <Tim.Deegan@...rix.com>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	<akpm@...ux-foundation.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fix jiffy calculations in calibrate_delay_direct
	 to handle overflow

>>> On 09.02.11 at 10:53, Jiri Slaby <jslaby@...e.cz> wrote:
> On 02/09/2011 10:44 AM, Jan Beulich wrote:
>>>>> On 09.02.11 at 10:21, Jiri Slaby <jslaby@...e.cz> wrote:
>>> On 02/09/2011 09:31 AM, Jan Beulich wrote:
>>>> Fixes a hang when booting as dom0 under Xen, when jiffies can be
>>>> quite large by the time the kernel init gets this far.
>>>
>>> As I wrote this might happen if the boot till this point takes ~ 5
>>> minutes because we start at -5 minutes.
>>>
>>> That said, is this a candidate for stable? (If so, please CC stable.)
>> 
>> Honestly, I'm not certain (given that mainline Xen Dom0 support
>> is still only in its beginnings).
> 
> What about other VMs? If I run few non-kvm qemu VMs (kvm presets lpj) on
> a busy dual-core machine, this will be a problem too, right?

Yes, quite possible indeed.

Jan

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