Re: [RFC PATCH 2/3] sched: add yield_to function

Srivatsa Vaddagiri
2010-12-03T13:30:57Z

On Fri, Dec 03, 2010 at 02:23:39PM +0100, Peter Zijlstra wrote:
> Right, so another approach might be to simply swap the vruntime between
> curr and p.

Can't that cause others to stave? For ex: consider a cpu p0 having these tasks:

p0 -> A0 B0 A1

A0/A1 have entered some sort of AB<->BA spin-deadlock, as a result A0 wants to
direct yield to A1 which wants to direct yield to A0. If we keep swapping their
runtimes, can't it starve B0?

- vatsa