linux-kernel - Re: [RFC PATCH RT] rwsem: The return of multi-reader PI rwsems

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Message-ID: <20140410232542.23ee9920@gandalf.local.home>
Date:	Thu, 10 Apr 2014 23:25:42 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Clark Williams <williams@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [RFC PATCH RT] rwsem: The return of multi-reader PI rwsems

On Fri, 11 Apr 2014 04:50:26 +0200
Mike Galbraith <umgwanakikbuti@...il.com> wrote:

> Oh, there was another useful bit. 
> 
> 3.12.17-rt25       403991     384216     377786
>                    405466     394011     392850
> 
> 3.12.17-nopreempt  109049     186133     118766  !?!.. ew, TTWU_QUEUE
>                    350385     318786     367336  !TTWU_QUEUE
>                    326009     356939     378215  !TTWU_QUEUE
> 
> IPI == low-pass filter.

I'm sorry, but I don't have the foggiest clue to what the above means.

-- Steve
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