From: Frederic Weisbecker <fweisbec@gmail.com>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Lai Jiangshan <laijs@cn.fujitsu.com>,
Joe Korty <joe.korty@ccur.com>,
mathieu.desnoyers@efficios.com, dhowells@redhat.com,
loic.minier@linaro.org, dhaval.giani@gmail.com,
tglx@linutronix.de, linux-kernel@vger.kernel.org,
josh@joshtriplett.org, houston.jim@comcast.net
Subject: Re: [PATCH] a local-timer-free version of RCU
Date: Sat, 13 Nov 2010 23:30:49 +0100 [thread overview]
Message-ID: <20101113223046.GB5445@nowhere> (raw)
In-Reply-To: <20101111041920.GD3134@linux.vnet.ibm.com>
On Wed, Nov 10, 2010 at 08:19:20PM -0800, Paul E. McKenney wrote:
> On Wed, Nov 10, 2010 at 06:31:11PM +0100, Peter Zijlstra wrote:
> > On Wed, 2010-11-10 at 16:54 +0100, Frederic Weisbecker wrote:
> > > run the sched tick and if there was nothing to do
> > > for some time and we are in userspace, deactivate it.
> >
> > Not for some time, immediately, have the tick track if it was useful, if
> > it was not, have it stop itself, like:
> >
> > tick()
> > {
> > int stop = 1;
> >
> > if (nr_running > 1)
> > stop = 0;
> >
> > if(rcu_needs_cpu())
> > stop = 0;
> >
> > ...
> >
> >
> > if (stop)
> > enter_nohz_mode();
> > }
>
> I am still holding out for a dyntick-hpc version of RCU that does not
> need the tick. ;-)
So you don't think it would be an appropriate solution? Keeping the tick for short
periods of time while we need it only, that looks quite a good way to try.
Hmm?
next prev parent reply other threads:[~2010-11-13 22:30 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-04 23:21 dyntick-hpc and RCU Paul E. McKenney
2010-11-05 5:27 ` Frederic Weisbecker
2010-11-05 5:38 ` Frederic Weisbecker
2010-11-05 15:06 ` Paul E. McKenney
2010-11-05 20:06 ` Dhaval Giani
2010-11-05 15:04 ` Paul E. McKenney
2010-11-08 14:10 ` Frederic Weisbecker
2010-11-05 21:00 ` [PATCH] a local-timer-free version of RCU Joe Korty
2010-11-06 19:28 ` Paul E. McKenney
2010-11-06 19:34 ` Mathieu Desnoyers
2010-11-06 19:42 ` Mathieu Desnoyers
2010-11-06 19:44 ` Paul E. McKenney
2010-11-08 2:11 ` Udo A. Steinberg
2010-11-08 2:19 ` Udo A. Steinberg
2010-11-08 2:54 ` Paul E. McKenney
2010-11-08 15:32 ` Frederic Weisbecker
2010-11-08 19:38 ` Paul E. McKenney
2010-11-08 20:40 ` Frederic Weisbecker
2010-11-10 18:08 ` Paul E. McKenney
2010-11-08 15:06 ` Frederic Weisbecker
2010-11-08 15:18 ` Joe Korty
2010-11-08 19:50 ` Paul E. McKenney
2010-11-08 19:49 ` Paul E. McKenney
2010-11-08 20:51 ` Frederic Weisbecker
2010-11-06 20:03 ` Mathieu Desnoyers
2010-11-09 9:22 ` Lai Jiangshan
2010-11-10 15:54 ` Frederic Weisbecker
2010-11-10 17:31 ` Peter Zijlstra
2010-11-10 17:45 ` Frederic Weisbecker
2010-11-11 4:19 ` Paul E. McKenney
2010-11-13 22:30 ` Frederic Weisbecker [this message]
2010-11-16 1:28 ` Paul E. McKenney
2010-11-16 13:52 ` Frederic Weisbecker
2010-11-16 15:51 ` Paul E. McKenney
2010-11-17 0:52 ` Frederic Weisbecker
2010-11-17 1:25 ` Paul E. McKenney
2011-03-07 20:31 ` [PATCH] An RCU for SMP with a single CPU garbage collector Joe Korty
[not found] ` <20110307210157.GG3104@linux.vnet.ibm.com>
2011-03-07 21:16 ` Joe Korty
2011-03-07 21:33 ` Joe Korty
2011-03-07 22:51 ` Joe Korty
2011-03-08 9:07 ` Paul E. McKenney
2011-03-08 15:57 ` Joe Korty
2011-03-08 22:53 ` Joe Korty
2011-03-10 0:30 ` Paul E. McKenney
2011-03-10 0:28 ` Paul E. McKenney
2011-03-09 22:29 ` Frederic Weisbecker
2011-03-09 22:15 ` [PATCH 2/4] jrcu: tap rcu_read_unlock Joe Korty
2011-03-10 0:34 ` Paul E. McKenney
2011-03-10 19:50 ` JRCU Theory of Operation Joe Korty
2011-03-12 14:36 ` Paul E. McKenney
2011-03-13 0:43 ` Joe Korty
2011-03-13 5:56 ` Paul E. McKenney
2011-03-13 23:53 ` Joe Korty
2011-03-14 0:50 ` Paul E. McKenney
2011-03-14 0:55 ` Josh Triplett
2011-03-09 22:16 ` [PATCH 3/4] jrcu: tap might_resched() Joe Korty
2011-03-09 22:17 ` [PATCH 4/4] jrcu: add new stat to /sys/kernel/debug/rcu/rcudata Joe Korty
2011-03-09 22:19 ` [PATCH 1/4] jrcu: remove preempt_enable() tap [resend] Joe Korty
2011-03-12 14:36 ` [PATCH] An RCU for SMP with a single CPU garbage collector Paul E. McKenney
2011-03-13 1:25 ` Joe Korty
2011-03-13 6:09 ` Paul E. McKenney
[not found] <757455806.950179.1289232791283.JavaMail.root@sz0076a.westchester.pa.mail.comcast.net>
2010-11-08 16:15 ` [PATCH] a local-timer-free version of RCU houston.jim
2010-11-08 19:52 ` Paul E. McKenney
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