Re: [PATCH] rcu: Is it safe to enter an RCU read-side criticalsection?

From: Steven Rostedt
Date: Mon Sep 09 2013 - 11:47:09 EST


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

> On Mon, 9 Sep 2013 15:24:55 +0000
> Christoph Lameter <cl@xxxxxxxxx> 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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