From: Frederic Weisbecker <fweisbec@gmail.com>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca,
josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de,
peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com,
edumazet@google.com, darren@dvhart.com, sbw@mit.edu
Subject: Re: [PATCH RFC nohz_full v2 6/7] nohz_full: Add full-system-idle state machine
Date: Mon, 1 Jul 2013 22:55:56 +0200 [thread overview]
Message-ID: <20130701205554.GQ7246@somewhere.redhat.com> (raw)
In-Reply-To: <20130701181040.GO3773@linux.vnet.ibm.com>
On Mon, Jul 01, 2013 at 11:10:40AM -0700, Paul E. McKenney wrote:
> On Mon, Jul 01, 2013 at 06:35:31PM +0200, Frederic Weisbecker wrote:
> > What makes sure that we are not reading a stale value of rdtp->dynticks_idle
> > in the following scenario:
> >
> > CPU 0 CPU 1
> >
> > //CPU 1 idle
> > //rdtp(1)->dynticks_idle == 0
> >
> > sysidle_check_cpu(CPU 1) {
> > rdtp(1)->dynticks_idle == 0
> > }
> > cmpxchg(full_sysidle_state,
> > ...RCU_SYSIDLE_SHORT)
> > rcu_irq_exit() {
>
> rcu_irq_enter(), right?
>
Woops, I meant rcu_idle_exit(). But yeah rcu_irq_enter() as well.
Thanks.
next prev parent reply other threads:[~2013-07-01 20:56 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-28 20:09 [PATCH RFC nohz_full 0/7] v2 Provide infrastructure for full-system idle Paul E. McKenney
2013-06-28 20:10 ` [PATCH RFC nohz_full v2 1/7] nohz_full: Add Kconfig parameter for scalable detection of all-idle state Paul E. McKenney
2013-06-28 20:10 ` [PATCH RFC nohz_full v2 2/7] nohz_full: Add rcu_dyntick data " Paul E. McKenney
2013-07-01 15:31 ` Josh Triplett
2013-07-01 15:52 ` Paul E. McKenney
2013-07-01 18:16 ` Josh Triplett
2013-07-01 18:23 ` Paul E. McKenney
2013-07-01 18:34 ` Josh Triplett
2013-07-01 19:16 ` Paul E. McKenney
2013-07-02 5:10 ` Mike Galbraith
2013-07-02 5:58 ` Paul E. McKenney
2013-06-28 20:10 ` [PATCH RFC nohz_full v2 3/7] nohz_full: Add per-CPU idle-state tracking Paul E. McKenney
2013-07-01 15:33 ` Josh Triplett
2013-06-28 20:10 ` [PATCH RFC nohz_full v2 4/7] nohz_full: Add full-system idle states and variables Paul E. McKenney
2013-06-28 20:10 ` [PATCH RFC nohz_full v2 5/7] nohz_full: Add full-system-idle arguments to API Paul E. McKenney
2013-06-28 20:10 ` [PATCH RFC nohz_full v2 6/7] nohz_full: Add full-system-idle state machine Paul E. McKenney
2013-07-01 16:35 ` Frederic Weisbecker
2013-07-01 18:10 ` Paul E. McKenney
2013-07-01 20:55 ` Frederic Weisbecker [this message]
2013-07-01 16:53 ` Frederic Weisbecker
2013-07-01 18:17 ` Paul E. McKenney
2013-07-01 21:38 ` Frederic Weisbecker
2013-07-01 22:51 ` Paul E. McKenney
2013-06-28 20:10 ` [PATCH RFC nohz_full v2 7/7] nohz_full: Force RCU's grace-period kthreads onto timekeeping CPU Paul E. McKenney
2013-07-01 15:19 ` [PATCH RFC nohz_full 0/7] v2 Provide infrastructure for full-system idle Andi Kleen
2013-07-01 16:03 ` Paul E. McKenney
2013-07-01 16:19 ` Andi Kleen
2013-07-01 19:19 ` Paul E. McKenney
2013-07-01 19:43 ` Christoph Lameter
2013-07-01 19:56 ` Paul E. McKenney
2013-07-01 20:24 ` Christoph Lameter
2013-07-01 20:43 ` Thomas Gleixner
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