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Message-ID: <1397184626.5139.24.camel@marge.simpson.net>
Subject: Re: [RFC PATCH RT] rwsem: The return of multi-reader PI rwsems
From: Mike Galbraith <umgwanakikbuti@gmail.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
        linux-rt-users <linux-rt-users@vger.kernel.org>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Paul Gortmaker <paul.gortmaker@windriver.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Clark Williams <williams@redhat.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@kernel.org>
Date: Fri, 11 Apr 2014 04:50:26 +0200
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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.

-Mike