From: Glauber Costa <glommer@redhat.com>
To: Avi Kivity <avi@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] allow userspace to adjust kvmclock offset
Date: Tue, 13 Oct 2009 09:46:38 -0300 [thread overview]
Message-ID: <20091013124638.GC8092@mothafucka.localdomain> (raw)
In-Reply-To: <4AD4730C.9010305@redhat.com>
On Tue, Oct 13, 2009 at 03:31:08PM +0300, Avi Kivity wrote:
> On 10/13/2009 03:28 PM, Glauber Costa wrote:
>>
>>> Do we want an absolute or relative adjustment?
>>>
>> What exactly do you mean?
>>
>
> Absolute adjustment: clock = t
> Relative adjustment: clock += t
The delta is absolute, but the adjustment in the clock is relative.
So we pick the difference between what userspace is passing us and what
we currently have, then relatively adds up so we can make sure we won't
go back or suffer a too big skew.
next prev parent reply other threads:[~2009-10-13 12:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-06 17:24 Glauber Costa
2009-10-12 8:53 ` Avi Kivity
2009-10-13 12:28 ` Glauber Costa
2009-10-13 12:31 ` Avi Kivity
2009-10-13 12:46 ` Glauber Costa [this message]
2009-10-15 0:46 ` Avi Kivity
2009-10-15 14:58 ` Glauber Costa
2009-10-22 16:23 ` Avi Kivity
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