From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: "Yang, Sheng" <sheng.yang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: [RFC][PATCH 1/2] KVM: In-kernel PIT model
Date: Thu, 24 Jan 2008 11:26:29 +0200 [thread overview]
Message-ID: <479859C5.6010703@qumranet.com> (raw)
In-Reply-To: <200801241729.18787.sheng.yang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Yang, Sheng wrote:
> I updated patch using ktime_get() (Is it too heavy?).
>
>
Shouldn't be. At least on modern hosts.
> And currently all the muldiv64() is used to divide 1e9, which can be insteaded
> by ">> 30" approximately. What's your opinion?
>
Accuracy is more important. And modern processors eat 64-bit divides
for breakfast, they're certainly much less expensive than vmexits.
--
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prev parent reply other threads:[~2008-01-24 9:26 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-21 9:18 [RFC][PATCH 1/2] KVM: In-kernel PIT model Yang, Sheng
[not found] ` <200801211718.23664.sheng.yang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2008-01-21 9:53 ` Jan Kiszka
[not found] ` <47946B96.4040508-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org>
2008-01-21 10:14 ` Avi Kivity
[not found] ` <47947088.5030309-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-21 10:22 ` Jan Kiszka
[not found] ` <47947252.7000606-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org>
2008-01-21 10:44 ` Avi Kivity
2008-01-21 10:28 ` Carsten Otte
[not found] ` <479473D0.7000002-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>
2008-01-22 1:15 ` Yang, Sheng
2008-01-22 13:54 ` Avi Kivity
[not found] ` <4795F582.7050802-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-23 6:00 ` Yang, Sheng
[not found] ` <200801231400.36063.sheng.yang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2008-01-23 9:46 ` Avi Kivity
[not found] ` <47970CEE.2050000-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-24 9:29 ` Yang, Sheng
[not found] ` <200801241729.18787.sheng.yang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2008-01-24 9:26 ` Avi Kivity [this message]
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