From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>, Dave Jones <davej@redhat.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Serge Hallyn <serge.hallyn@canonical.com>,
linux-kernel@vger.kernel.org
Subject: Re: lots of suspicious RCU traces
Date: Wed, 24 Oct 2012 13:15:39 -0700 [thread overview]
Message-ID: <20121024201539.GD2340@swordfish> (raw)
In-Reply-To: <20121024201117.GJ2465@linux.vnet.ibm.com>
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
>
next prev parent reply other threads:[~2012-10-24 20:18 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-17 3:49 lots of suspicious RCU traces Dave Jones
2012-10-24 16:42 ` Sergey Senozhatsky
2012-10-24 18:06 ` Oleg Nesterov
2012-10-24 18:21 ` Sergey Senozhatsky
2012-10-24 18:52 ` Oleg Nesterov
2012-10-24 19:17 ` Sergey Senozhatsky
2012-10-24 19:41 ` Paul E. McKenney
2012-10-24 19:50 ` Sergey Senozhatsky
2012-10-24 20:11 ` Paul E. McKenney
2012-10-24 20:15 ` Sergey Senozhatsky [this message]
2012-10-24 22:32 ` Frederic Weisbecker
2012-10-25 5:50 ` Sergey Senozhatsky
2012-10-25 7:06 ` Frederic Weisbecker
2012-10-25 7:41 ` Sergey Senozhatsky
2012-10-26 9:40 ` [PATCH] rcu: Fix unrecovered RCU user mode in syscall_trace_leave() Frederic Weisbecker
2012-10-26 9:44 ` lots of suspicious RCU traces Frederic Weisbecker
2012-10-26 11:16 ` Sergey Senozhatsky
2012-10-26 15:16 ` Dave Jones
2012-10-25 5:55 ` Sergey Senozhatsky
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