From: Avi Kivity <avi@redhat.com>
To: Glauber Costa <glommer@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] keep guest wallclock in sync with host clock
Date: Wed, 02 Sep 2009 15:56:16 +0300 [thread overview]
Message-ID: <4A9E6B70.2080707@redhat.com> (raw)
In-Reply-To: <20090902124839.GM30340@mothafucka.localdomain>
On 09/02/2009 03:48 PM, Glauber Costa wrote:
>
>> You can't prevent host preemption. You might read kvmclock again and
>> repeat if too much time has passed.
>>
> But then you can be scheduled after you did settimeofday, but before reading
> kvmclock again. Since we're aiming for periodic adjustments here,
> any discrepancies should not last long, so we can maybe live with it.
>
do {
read_kvmclock
settimeofday
read_kvmclock
} while the_difference_between_the_two_reads_is_too_large
--
error compiling committee.c: too many arguments to function
prev parent reply other threads:[~2009-09-02 12:56 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-01 11:50 [PATCH 0/2] Automatically grab wallclock time updates from hypervisor Glauber Costa
2009-09-01 11:50 ` [PATCH 1/2] keep guest wallclock in sync with host clock Glauber Costa
2009-09-01 11:50 ` [PATCH 2/2] add sysctl for kvm wallclock sync Glauber Costa
2009-09-02 6:54 ` Chris Lalancette
2009-09-02 11:31 ` Glauber Costa
2009-09-02 11:40 ` Avi Kivity
2009-09-02 11:44 ` [PATCH 1/2] keep guest wallclock in sync with host clock Avi Kivity
2009-09-02 12:21 ` Glauber Costa
2009-09-02 12:24 ` Avi Kivity
2009-09-02 12:48 ` Glauber Costa
2009-09-02 12:56 ` Avi Kivity [this message]
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