Re: Stolen and degraded time and schedulers


* Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:

Ingo Molnar wrote:
touching the 'timer tick' is the wrong approach. 'stolen time' only
matters to the /scheduler tick/. So extend the hypervisor interface to
allow the injection of 'virtual' scheduler tick events: via the use of a
special clockevents device - do not change clockevents itself.

I didn't. I was using sloppy terminology: I hang the stolen time
accounting off the Xen timer interrupt routine, just so that it gets
run every now and again.

i dont understand: how are you separating 'stolen time' drifts from
events generated for absolute timeouts?

I suppose I could explicitly hook stolen time accounting into the
scheduler, but its not obvious to me that it's necessary.

right now i dont see any clean way to solve this problem without having
two clockevents drivers: one for the scheduler, one for timer events.

Ingo
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