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

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Message-ID: <4D0CEA7F.9080603@redhat.com>
Date:	Sat, 18 Dec 2010 19:08:15 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Mike Galbraith <mgalbraith@...e.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 12/17/2010 09:15 AM, Mike Galbraith wrote:
> BTW, with this vruntime donation thingy, what prevents a task from
> forking off accomplices who do nothing but wait for a wakeup and
> yield_to(exploit)?
>

What's the difference between that and forking off accomplices who 
run(exploit) directly?

Many threads dominating the scheduler has been solved by group 
scheduling.  We need to make sure directed yield doesn't violate that, 
but I don't see new problems.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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