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

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Date:	Wed, 05 Jan 2011 11:24:14 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Avi Kivity <avi@...hat.com>, Rik van Riel <riel@...hat.com>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	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 17:40 +0900, KOSAKI Motohiro wrote:
> > > If you are interesting GIL mess and issue, please feel free to ask more.
> > 
> > I suggest looking into an explicit round-robin scheme, where each thread 
> > adds itself to a queue and an unlock wakes up the first waiter.
> 
> I'm sure you haven't try your scheme. but I did. It's slow.

Of course it is, but then your locking scheme (GIL) is the problem, not
the locking constructs.
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