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

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Message-ID: <20100401170230.GW29241@sequoia.sous-sol.org>
Date:	Thu, 1 Apr 2010 10:02:30 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Darren Hart <dvhltc@...ibm.com>
Cc:	Roland Dreier <rdreier@...co.com>,
	"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

* Darren Hart (dvhltc@...ibm.com) wrote:
> 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!

No worries Darren, I happen to be interested in the topic too ;-)
(from KVM point of view, which has a slightly different take)
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