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

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Message-ID: <4D0F3266.90908@redhat.com>
Date:	Mon, 20 Dec 2010 12:39:34 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Mike Galbraith <efault@....de>
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 12/20/2010 12:33 PM, Mike Galbraith wrote:
> >
> >  Correct.  I don't want the other task to run before me, I just don't
> >  want to run before it.
>
> OK, so what I gather is that if you can preempt another of your own
> threads to get the target to cpu, that would be a good thing whether
> he's on the same cpu as yield_to() caller or not.  If the target is
> sharing a cpu with you, that's even better.  Correct?

Correct.  I'm not interested in scheduling wrt other tasks, just my tasks.

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).

> Would a kick/hint option be useful?

Depends on what it does...

-- 
error compiling committee.c: too many arguments to function

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