linux-kernel - Re: RFC: Ideal Adaptive Spinning Conditions

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Message-ID: <4BB3FF03.7060400@us.ibm.com>
Date:	Wed, 31 Mar 2010 19:03:47 -0700
From:	Darren Hart <dvhltc@...ibm.com>
To:	Roland Dreier <rdreier@...co.com>
CC:	"lkml\, " <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Gregory Haskins <ghaskins@...ell.com>,
	Sven-Thorsten Dietrich <sdietrich@...ell.com>,
	Peter Morreale <pmorreale@...ell.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: RFC: Ideal Adaptive Spinning Conditions

Roland Dreier wrote:
>  > I'm looking at some adaptive spinning with futexes as a way to help
>  > reduce the dependence on sched_yield() to implement userspace
>  > spinlocks. Chris, I included you in the CC after reading your comments
>  > regarding sched_yield() at kernel summit and I thought you might be
>  > interested.
> 
> I think you may have the wrong Chris.  Chris Wright wasn't at the most
> recent kernel summit and I do have a vague recollection of Chris Mason
> mentioning that Oracle developers found that sched_yield() performed
> better than futexes + kernel scheduling.

Oh bother, Sorry Chris! I even talked to Chris Wright about this already 
in person and he told me I probably was looking for Chris Mason, and I 
still got the last names crossed up!

-- 
Darren Hart
IBM Linux Technology Center
Real-Time Linux Team
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