linux-kernel - Re: [RFC -v3 PATCH 2/3] sched: add yield

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Message-ID: <1294160890.2016.171.camel@laptop>
Date:	Tue, 04 Jan 2011 18:08:10 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Hillf Danton <dhillf@...il.com>
Cc:	Rik van Riel <riel@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Avi Kiviti <avi@...hat.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Mike Galbraith <efault@....de>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [RFC -v3 PATCH 2/3] sched: add yield_to function

On Wed, 2011-01-05 at 00:51 +0800, Hillf Danton wrote:
> Where is the yield_to callback in the patch for RT schedule class?
> If @p is RT, what could you do? 

RT guests are a pipe dream, you first need to get the hypervisor (kvm in
this case) to be RT, which it isn't. Then you either need to very
statically set-up the host and the guest scheduling constraints (not
possible with RR/FIFO) or have a complete paravirt RT scheduler which
communicates its requirements to the host.


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