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

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Message-Id: <20110105120219.B639.A69D9226@jp.fujitsu.com>
Date:	Wed,  5 Jan 2011 12:17:02 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	kosaki.motohiro@...fujitsu.com, 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

> NAK NAK NAK, yield_to is utter crap, and the only reason kvm 'needs' it
> is because its wants to be utter crap (run unmodified guests).
> 
> There is plenty of sane serialization primitives for userspace, fix your
> locking mess instead of pushing crap.
> 
> The only reason I'm maybe half-way considering this is because its a
> pure in-kernel interface which we can 'fix' once unmodified guests
> aren't important anymore.

KVM also have slow and inefficient mecanism. Userspace have a lot of
slow primitives too.

But okey, I'm withdraw this claim even though I disagree userspace have
plenty of sane serialization. It's offtopic and we need more discuss
at proper place.

Thanks.



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