From: Mike Galbraith <efault@gmx.de>
To: vatsa@linux.vnet.ibm.com
Cc: Rik van Riel <riel@redhat.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Avi Kiviti <avi@redhat.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Chris Wright <chrisw@sous-sol.org>
Subject: Re: [RFC -v2 PATCH 2/3] sched: add yield_to function
Date: Tue, 14 Dec 2010 12:03:58 +0100 [thread overview]
Message-ID: <1292324638.7436.29.camel@marge.simson.net> (raw)
In-Reply-To: <20101214102409.GA3665@linux.vnet.ibm.com>
On Tue, 2010-12-14 at 15:54 +0530, Srivatsa Vaddagiri wrote:
> On Tue, Dec 14, 2010 at 07:08:16AM +0100, Mike Galbraith wrote:
> > That part looks ok, except for the yield cross cpu bit. Trying to yield
> > a resource you don't have doesn't make much sense to me.
>
> So another (crazy) idea is to move the "yieldee" task on another cpu over to
> yielding task's cpu, let it run till the end of yielding tasks slice and then
> let it go back to the original cpu at the same vruntime position!
Yeah, pulling the intended recipient makes fine sense. If he doesn't
preempt you, you can try to swap vruntimes or whatever makes arithmetic
sense and will help. Dunno how you tell him how long he can keep the
cpu though, and him somehow going back home needs to be a plain old
migration, no fancy restoration of ancient history vruntime.
-Mike
next prev parent reply other threads:[~2010-12-14 11:03 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-14 3:44 [RFC -v2 PATCH 0/3] directed yield for Pause Loop Exiting Rik van Riel
2010-12-14 3:45 ` [RFC -v2 PATCH 1/3] kvm: keep track of which task is running a KVM vcpu Rik van Riel
2010-12-14 3:46 ` [RFC -v2 PATCH 2/3] sched: add yield_to function Rik van Riel
2010-12-14 6:08 ` Mike Galbraith
2010-12-14 10:24 ` Srivatsa Vaddagiri
2010-12-14 11:03 ` Mike Galbraith [this message]
2010-12-14 11:26 ` Srivatsa Vaddagiri
2010-12-14 12:47 ` Mike Galbraith
2010-12-16 19:49 ` Rik van Riel
2010-12-17 6:56 ` Mike Galbraith
2010-12-17 7:15 ` Mike Galbraith
2010-12-18 17:08 ` Avi Kivity
2010-12-18 19:13 ` Mike Galbraith
2010-12-19 6:08 ` Avi Kivity
2010-12-20 15:40 ` Rik van Riel
2010-12-20 16:04 ` Mike Galbraith
2010-12-28 5:54 ` Mike Galbraith
2010-12-28 22:34 ` Rik van Riel
2010-12-17 15:09 ` Avi Kivity
2010-12-17 19:51 ` Mike Galbraith
2010-12-18 17:02 ` Avi Kivity
2010-12-18 19:06 ` Mike Galbraith
2010-12-19 6:21 ` Avi Kivity
2010-12-19 10:05 ` Mike Galbraith
2010-12-19 9:19 ` Avi Kivity
2010-12-19 11:18 ` Mike Galbraith
2010-12-20 8:39 ` Mike Galbraith
2010-12-20 8:45 ` Avi Kivity
2010-12-20 8:55 ` Mike Galbraith
2010-12-20 9:03 ` Avi Kivity
2010-12-20 9:30 ` Mike Galbraith
2010-12-20 9:46 ` Avi Kivity
2010-12-20 10:33 ` Mike Galbraith
2010-12-20 10:39 ` Avi Kivity
2010-12-20 10:46 ` Mike Galbraith
2010-12-20 10:49 ` Avi Kivity
2010-12-20 10:50 ` Mike Galbraith
2010-12-20 11:06 ` Avi Kivity
2010-12-14 12:22 ` Peter Zijlstra
2010-12-18 14:50 ` Rik van Riel
2010-12-14 3:48 ` [RFC -v2 PATCH 3/3] kvm: use yield_to instead of sleep in kvm_vcpu_on_spin Rik van Riel
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