linux-kernel - Re: lots of suspicious RCU traces

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Message-ID: <20121024201539.GD2340@swordfish>
Date:	Wed, 24 Oct 2012 13:15:39 -0700
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, Dave Jones <davej@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	linux-kernel@...r.kernel.org
Subject: Re: lots of suspicious RCU traces

On (10/24/12 13:11), Paul E. McKenney wrote:
> > > > 
> > > > sorry, I meant idle from RCU point of view:
> > > > 
> > > > int rcu_is_cpu_idle(void)
> > > > {
> > > >          return !rcu_dynticks_nesting;
> > > > }
> > > 
> > > Hmmm...  This reproduces on UP builds, then?
> > 
> > I'll compile UP build (will offlining of N-1 CPUs do the trick?).
> 
> Oh -- you quoted the Tiny RCU (CONFIG_SMP=n) variant of rcu_is_cpu_idle(),

sorry, that was just an 'illustration'.

	-ss

> so I just thought that you were reproducing on CONFIG_SMP=n.  You would
> have to actually rebuild the kernel to get the different version.
> 
> But never mind!  RCU_USER_QS depends on CONFIG_SMP=y, so my question
> was irrelevant.
> 
> 							Thanx, Paul
> 
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