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Date: Thu, 28 Jul 2011 12:34:22 -0700
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
        linux-rt-users <linux-rt-users@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Jason Wessel <jason.wessel@windriver.com>
Subject: Re: [ANNOUNCE] 3.0-rt4
Message-ID: <20110728193422.GT2403@linux.vnet.ibm.com>
Reply-To: paulmck@linux.vnet.ibm.com
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On Thu, Jul 28, 2011 at 09:05:14PM +0200, Thomas Gleixner wrote:
> On Thu, 28 Jul 2011, Paul E. McKenney wrote:
> 
> > On Thu, Jul 28, 2011 at 07:43:43PM +0200, Thomas Gleixner wrote:
> > > 
> > > On Thu, 28 Jul 2011, Paul E. McKenney wrote:
> > > 
> > > > On Wed, Jul 27, 2011 at 11:37:09PM +0200, Thomas Gleixner wrote:
> > > > > Dear RT Folks,
> > > > > 
> > > > > I'm pleased to announce the 3.0-rt4 release.
> > > > 
> > > > 3.0-rt5 boots single-CPU under KVM on a 32-bit laptop.  Also with "-smp
> > > > 2".  It even survived a minute or so of rcutorture in both cases.  ;-)
> > > > 
> > > > Some weirdness with interactivity -- if the system is idle aside from
> > > > rcutorture, the rcutorture.stat_interval console messages don't come
> > > > out unless I hit "enter" on the console.  But if I run "top", they do
> > > > come out regularly.  Might well be KVM's fault, except that running
> > > > rcutorture on non-rt kernels doesn't exhibit this behavior.
> > > 
> > > Nah, that's my lazy "avoid printing from atomic context" hack :)
> > 
> > Well, then, that does seem to be working...  ;-)
> > 
> > Except that these printk()s are from process level -- rcu_torture_stats()
> > in kernel/rcutorture.c.
> > 
> > > > I guess I should try RCU_BOOST=y, then...
> > > 
> > > Good luck :)
> > 
> > Compiled without error and has been running rcutorture smp=2 for
> > about 30 minutes now.
> 
> Hmm, perhaps it was some weird interaction with NOHZ which is a
> separate issue.

OK, I guess I have no alternative but to try enabling NOHZ...

							Thanx, Paul