linux-kernel - Re: [PATCH 08/18] Add helper functions for time computation

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Message-ID: <4C3E09C8.2020806@redhat.com>
Date:	Wed, 14 Jul 2010 15:02:32 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Zachary Amsden <zamsden@...hat.com>
CC:	KVM <kvm@...r.kernel.org>, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Glauber Costa <glommer@...hat.com>,
	Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 08/18] Add helper functions for time computation

On 07/12/2010 10:25 PM, 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.
>
> Signed-off-by: Zachary Amsden<zamsden@...hat.com>

Acked-by: Rik van Riel <riel@...hat.com>

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