linux-kernel - Re: [GIT PULL RFC] pvclock cleanups and pvclock vsyscall support

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Date:	Sun, 18 Oct 2009 17:18:16 +0900
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Avi Kivity <avi@...hat.com>
CC:	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	kurt.hackel@...cle.com,
	Glauber de Oliveira Costa <gcosta@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Chris Mason <chris.mason@...cle.com>
Subject: Re: [GIT PULL RFC] pvclock cleanups and pvclock vsyscall support

On 10/18/09 15:43, Avi Kivity wrote:
> On 10/16/2009 04:46 AM, Jeremy Fitzhardinge wrote:
>> Care to cook up a patch to implement the kvm bits to make sure it all
>> works OK for you?
>>    
>
> I've started to do that, but it occurs to me that we're missing out on
> NUMA placement by forcing all clocks to be on the same page. OTOH, if
> the clocks are heavily used, they'll stay in cache, and if not, who
> cares.
>

Yes, I'd say so.  I'd expect the data to be very close to read-only, so
the lines should be shared pretty efficiently. 

On the other hand, there's nothing to stop us from moving to multiple
pages in future (either to support NUMA placement, or just more than 64
cpus).

    J
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