linux-kernel - Re: [PATCH] rcu: Is it safe to enter an RCU read-side critical section?

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Date:	Mon, 9 Sep 2013 11:47:00 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Christoph Lameter <cl@...ux.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...icios.com, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, dhowells@...hat.com,
	edumazet@...gle.com, darren@...art.com, sbw@....edu
Subject: Re: [PATCH] rcu: Is it safe to enter an RCU read-side critical
 section?

On Mon, 9 Sep 2013 11:41:16 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Mon, 9 Sep 2013 15:24:55 +0000
> Christoph Lameter <cl@...ux.com> wrote:
> 
> > On Mon, 9 Sep 2013, Peter Zijlstra wrote:
> > 
> > > > Slander. Certainly validation is good. Its just that PREEMPT kernels are
> > > > not in use
> > >
> > > Complete bullshit, its part of the mainline kernel, lots of people run
> > > them -- including me, and any patch is supposed to keep it working.
> > 
> > Nonsense. There is no main line distro that supports full preempt. Its an
> > academic exercise.
> 
> Red Hat MRG supports PREEMPT_RT. And Debian has an option to use
> PREEMPT_RT too. Two big main line distros.
> 
> So please, cut out the "academic exercise" crap.

Ubuntu Lucid supplies a CONFIG_PREEMPT kernel too:

http://kernel.ubuntu.com/~kernel-ppa/configs/lucid/amd64--preempt

-- Steve
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