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Re: [PATCH] Re: [Xen-devel] Time went backwards

To: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject: Re: [PATCH] Re: [Xen-devel] Time went backwards
From: Rik van Riel <riel@xxxxxxxxxx>
Date: Tue, 14 Mar 2006 10:25:18 -0500 (EST)
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On Tue, 14 Mar 2006, Keir Fraser wrote:
> On 14 Mar 2006, at 15:13, Rik van Riel wrote:
> 
> > Tick N:
> >     delta = 2.2
> >     stolen = 0.9
> >     blocked = 0.7
> > 
> >     stolen and blocked will not get incremented, while
> >     the per-cpu processed_time gets 2 jiffies
> 
> But we decrement delta_cpu *before* rounding down. So, after handling 
> stolen and blocked, we'll end up with delta_cpu==0.6 which gets rounded 
> down to 0 and so per-cpu processed_time gets 0 jiffies?

Hmmmm good point!

Now I no longer understand my own bugfix.  Great...

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