Re: [PATCH]sched: convert wall-time to vruntime forcheck_preempt_tick

From: Shaohua Li
Date: Thu Apr 07 2011 - 20:35:59 EST

On Thu, 2011-04-07 at 21:34 +0800, Mike Galbraith wrote:
> On Thu, 2011-04-07 at 20:43 +0800, Shaohua Li wrote:
> > In check_preempt_tick(), delta is vruntime and ideal_runtime is wall runtime.
> > Comparing vruntime and ideal_runtime looks buggy.
> Why is that buggy? It's a distance in units ns, ala wakeup_granularity,
> a number. This number just happens to be variable.
vruntime is scaled wall-time. In all other places we do the scale from
my understanding. I'm wondering why not do it here.

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