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From: Julien Desfossez <ju@klipix.org>
To: kvm@vger.kernel.org
Subject: vread in kvm_clock
Date: Wed, 15 Dec 2010 15:16:37 -0500	[thread overview]
Message-ID: <4D092225.3000300@klipix.org> (raw)

Hi,

I'm currently working with the kvm clocksource and I'm wondering if we 
could implement the vread function for this clock source when we are 
running on a host with constant_tsc.
If I understand correctly the hv_clock structure is per_cpu because of 
the eventual frequency changes, but in the case of constant_tsc (and 
after validation that the TSC is synchronized across all the cores) I 
think we could have a working vread function.

In case of migration, could we have a fallback in case we detect we end 
up on a CPU without constant_tsc ?

Any advice/explanation would be greatly appreciated !

Thanks,

Julien

             reply	other threads:[~2010-12-15 20:39 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-12-15 20:16 Julien Desfossez [this message]
2010-12-17 17:43 ` vread in kvm_clock Zachary Amsden
2010-12-19 15:27   ` Avi Kivity
2010-12-20  1:15     ` Zachary Amsden
2010-12-20  6:16       ` Avi Kivity
2010-12-20 20:48         ` Zachary Amsden

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