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

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Message-ID: <20100820173440.GF2937@mothafucka.localdomain>
Date:	Fri, 20 Aug 2010 14:34:41 -0300
From:	Glauber Costa <glommer@...hat.com>
To:	Zachary Amsden <zamsden@...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 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?
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