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

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Message-ID: <adaeij0gj3a.fsf@roland-alpha.cisco.com>
Date:	Wed, 31 Mar 2010 16:35:53 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Darren Hart <dvhltc@...ibm.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

 > 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.
-- 
Roland Dreier <rolandd@...co.com> || For corporate legal information go to:
http://www.cisco.com/web/about/doing_business/legal/cri/index.html
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