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Date: Mon, 20 Dec 2010 11:46:50 +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 12:39 +0200, Avi Kivity wrote: > 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). So in that case, a pull may be advantageous. > > 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. -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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