linux-kernel - Re: [KVM timekeeping 11/35] Add helper functions for time computation

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Date:	Mon, 23 Aug 2010 14:58:49 -1000
From:	Zachary Amsden <zamsden@...hat.com>
To:	Glauber Costa <glommer@...hat.com>
CC:	kvm@...r.kernel.org, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <johnstul@...ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: [KVM timekeeping 11/35] Add helper functions for time computation

On 08/20/2010 07:34 AM, Glauber Costa wrote:
> On Thu, Aug 19, 2010 at 10:07:25PM -1000, Zachary Amsden wrote:
>    
>> Add a helper function to compute the kernel time and convert nanoseconds
>> back to CPU specific cycles.  Note that these must not be called in preemptible
>> context, as that would mean the kernel could enter software suspend state,
>> which would cause non-atomic operation.
>>
>> Also, convert the KVM_SET_CLOCK / KVM_GET_CLOCK ioctls to use the kernel
>> time helper, these should be bootbased as well.
>>      
> This is one of the things I believe should be applied right now.
> Maybe we want a cut version of this patch, that exposes this API while
> adjusting KVM_SET_CLOCK / KVM_GET_CLOCK to get in early rather than late?
>    

The first half of the series, at least, is good to go upstream and ready 
for backport.  The trapping and later stuff obviously needs to get some 
upstream testing.
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