From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Pranith Kumar <pranith@gatech.edu>
Cc: "Amit Shah" <amit.shah@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
"Rik van Riel" <riel@redhat.com>,
"Ingo Molnar" <mingo@kernel.org>,
"Lai Jiangshan" <laijs@cn.fujitsu.com>,
"Dipankar Sarma" <dipankar@in.ibm.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Josh Triplett" <josh@joshtriplett.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Peter Zijlstra" <peterz@infradead.org>,
"Steven Rostedt" <rostedt@goodmis.org>,
"David Howells" <dhowells@redhat.com>,
"Eric Dumazet" <edumazet@google.com>,
dvhart@linux.intel.com,
"Frédéric Weisbecker" <fweisbec@gmail.com>,
"Oleg Nesterov" <oleg@redhat.com>,
"Silas Boyd-Wickizer" <sbw@mit.edu>
Subject: Re: [PATCH tip/core/rcu 1/2] rcu: Parallelize and economize NOCB kthread wakeups
Date: Sat, 23 Aug 2014 20:23:39 -0700 [thread overview]
Message-ID: <20140824032339.GK2663@linux.vnet.ibm.com> (raw)
In-Reply-To: <CAJhHMCCntYQy624Kwb5bs7MAKKYrSRbG0SezxgbQfHwYA2C40w@mail.gmail.com>
On Sat, Aug 23, 2014 at 08:26:10PM -0400, Pranith Kumar wrote:
> On Sat, Aug 23, 2014 at 12:51 PM, Paul E. McKenney
> <paulmck@linux.vnet.ibm.com> wrote:
>
> > It might well! Another possibility is that the early_initcall function
> > doing the synchronize_rcu() is happening before the early_initcall
> > creating the RCU grace-period kthreads.
> >
> > Seems like we need to close both holes. Let's see how your patch works
> > for Amit, and I am testing a patch for the possible early_initcall
> > ordering issue.
>
> I checked the init call which is calling synchronize_rcu():
> subsys_initcall(pm_sysrq_init); this is being called after
> early_initcall.
>
> The order of initcalls is early, core, postcore, arch, subsys, fs,
> device, late. So I guess that is ok.
>
> I wonder why it was not showing up in 12.04. I have a dual boot. Will
> test it out and see if I can find something.
Me, I am wondering about 7,000 callbacks being registered during early
boot time. ;-)
Thanx, Paul
next prev parent reply other threads:[~2014-08-24 3:23 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-23 7:43 [PATCH tip/core/rcu 1/2] rcu: Parallelize and economize NOCB kthread wakeups Pranith Kumar
2014-08-23 16:51 ` Paul E. McKenney
2014-08-24 0:26 ` Pranith Kumar
2014-08-24 3:23 ` Paul E. McKenney [this message]
2014-08-24 3:39 ` Pranith Kumar
2014-08-24 14:36 ` Paul E. McKenney
2014-08-27 4:43 ` Amit Shah
2014-08-27 16:21 ` Paul E. McKenney
2014-08-27 16:43 ` Pranith Kumar
2014-08-27 17:08 ` Paul E. McKenney
-- strict thread matches above, loose matches on Subject: below --
2014-07-07 22:48 [PATCH tip/core/rcu 0/2] Callback-offloading changes for 3.17 Paul E. McKenney
2014-07-11 13:35 ` [PATCH tip/core/rcu 1/2] rcu: Parallelize and economize NOCB kthread wakeups Paul E. McKenney
2014-08-08 8:40 ` Amit Shah
2014-08-08 16:25 ` Paul E. McKenney
2014-08-08 17:37 ` Amit Shah
2014-08-08 18:18 ` Paul E. McKenney
2014-08-08 18:34 ` Amit Shah
2014-08-08 21:43 ` Paul E. McKenney
2014-08-08 21:46 ` Paul E. McKenney
2014-08-11 7:13 ` Amit Shah
2014-08-11 16:28 ` Paul E. McKenney
2014-08-11 19:41 ` Amit Shah
2014-08-11 20:11 ` Paul E. McKenney
2014-08-11 20:18 ` Amit Shah
2014-08-11 20:34 ` Paul E. McKenney
2014-08-12 3:45 ` Paul E. McKenney
2014-08-12 5:33 ` Amit Shah
2014-08-12 16:06 ` Paul E. McKenney
2014-08-12 21:39 ` Paul E. McKenney
2014-08-12 21:41 ` Paul E. McKenney
2014-08-12 21:44 ` Paul E. McKenney
2014-08-13 5:44 ` Amit Shah
2014-08-13 13:00 ` Paul E. McKenney
2014-08-13 14:18 ` Paul E. McKenney
2014-08-15 5:24 ` Amit Shah
2014-08-15 15:04 ` Paul E. McKenney
2014-08-18 17:53 ` Amit Shah
2014-08-19 4:01 ` Paul E. McKenney
2014-08-22 12:24 ` Amit Shah
2014-08-22 12:36 ` Amit Shah
2014-08-22 12:56 ` Amit Shah
2014-08-22 14:48 ` Paul E. McKenney
2014-08-22 17:14 ` Amit Shah
2014-08-22 17:37 ` Amit Shah
2014-08-22 21:53 ` Paul E. McKenney
2014-08-22 21:57 ` Paul E. McKenney
2014-08-22 14:43 ` Paul E. McKenney
2014-08-12 5:27 ` Amit Shah
2014-08-12 16:08 ` Paul E. McKenney
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