linux-kernel - Re: [RFC -v5 PATCH 2/4] sched: Add yield

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Message-ID: <1295025343.2274.5.camel@twins>
Date:	Fri, 14 Jan 2011 18:15:43 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Rik van Riel <riel@...hat.com>
Cc:	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>, ttracy@...hat.com,
	dshaks@...hat.com
Subject: Re: [RFC -v5 PATCH 2/4] sched: Add yield_to(task, preempt)
 functionality.

On Fri, 2011-01-14 at 03:03 -0500, Rik van Riel wrote:
> From: Mike Galbraith <efault@....de>
> 
> Currently only implemented for fair class tasks.
> 
> Add a yield_to_task method() to the fair scheduling class. allowing the
> caller of yield_to() to accelerate another thread in it's thread group,
> task group.
> 
> Implemented via a scheduler hint, using cfs_rq->next to encourage the
> target being selected.  We can rely on pick_next_entity to keep things
> fair, so noone can accelerate a thread that has already used its fair
> share of CPU time.
> 
> This also means callers should only call yield_to when they really
> mean it.  Calling it too often can result in the scheduler just
> ignoring the hint.
> 
> Signed-off-by: Rik van Riel <riel@...hat.com>
> Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com>
> Signed-off-by: Mike Galbraith <efault@....de> 

Looks good to me, do you want me to merge this or will you merge it
through the kvm tree with all other patches?

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