linux-kernel - Re: [RFC -v2 PATCH 2/3] sched: add yield

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Date:	Mon, 20 Dec 2010 11:50:43 +0100
From:	Mike Galbraith <efault@....de>
To:	Avi Kivity <avi@...hat.com>
Cc:	Rik van Riel <riel@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [RFC -v2 PATCH 2/3] sched: add yield_to function

On Mon, 2010-12-20 at 12:49 +0200, Avi Kivity wrote:
> On 12/20/2010 12:46 PM, Mike Galbraith wrote:
> > >
> > >  However, if I'm all alone on my cpu, and the other task is runnable but
> > >  not running, behind some unrelated task, then I do need that task to be
> > >  preempted (or to move tasks around).
> >
> > So in that case, a pull may be advantageous.
> 
> Yes.
> 
> > >  >  Would a kick/hint option be useful?
> > >
> > >  Depends on what it does...
> >
> > Let you decide whether you only want to drop a hint and leave it at
> > that, or also attempt a preemption.
> 
> Who is "you" in this?  the scheduler?

The caller.

> I'm fine with hints so long as they are usually acted upon (if it isn't, 
> I'll go back to the guest, spin a bit more, and retry).



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