From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: josh@joshtriplett.org, Peter Zijlstra <peterz@infradead.org>,
linux-kernel@vger.kernel.org, mingo@kernel.org,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
tglx@linutronix.de, rostedt@goodmis.org, dhowells@redhat.com,
edumazet@google.com, dvhart@linux.intel.com, fweisbec@gmail.com,
oleg@redhat.com, bobby.prani@gmail.com
Subject: Re: [PATCH RFC tip/core/rcu 0/5] Expedited grace periods encouraging normal ones
Date: Wed, 1 Jul 2015 20:15:29 -0700 [thread overview]
Message-ID: <20150702031529.GB3717@linux.vnet.ibm.com> (raw)
In-Reply-To: <1435805445.6887.50.camel@gmail.com>
On Thu, Jul 02, 2015 at 04:50:45AM +0200, Mike Galbraith wrote:
> On Wed, 2015-07-01 at 19:18 -0700, Paul E. McKenney wrote:
>
> > Does their normal workload trigger the condition that results in the
> > expedited grace period? If so, do they use NO_HZ_FULL?
>
> They're having no trouble that I'm aware of, and I definitely would be
> made aware. They're not currently using a kernel with NO_HZ_FULL even
> built in, as that stuff is far far too raw in the current kernel.
>
> They may meet a NO_HZ_FULL enabled kernel soonish, but will be told to
> not turn it on for anything other than pure compute, as NO_HZ_FULL is
> currently not usable for mixed load in partitioned box, much less rt.
OK, sounds like synchronize_rcu_expedited() is a complete non-problem
for them, then.
Thanx, Paul
prev parent reply other threads:[~2015-07-02 3:15 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-30 21:48 [PATCH RFC tip/core/rcu 0/5] Expedited grace periods encouraging normal ones Paul E. McKenney
2015-06-30 21:48 ` [PATCH RFC tip/core/rcu 1/5] rcu: Prepare for expedited GP driving normal GP Paul E. McKenney
2015-06-30 21:48 ` [PATCH RFC tip/core/rcu 2/5] rcu: Short-circuit normal GPs via expedited GPs Paul E. McKenney
2015-07-01 10:03 ` Peter Zijlstra
2015-07-01 13:42 ` Paul E. McKenney
2015-07-01 20:59 ` Paul E. McKenney
2015-07-01 10:05 ` Peter Zijlstra
2015-07-01 13:41 ` Paul E. McKenney
2015-07-01 13:48 ` Peter Zijlstra
2015-07-01 14:03 ` Paul E. McKenney
2015-07-02 12:03 ` Peter Zijlstra
2015-07-02 14:06 ` Paul E. McKenney
2015-07-02 16:48 ` Peter Zijlstra
2015-07-02 19:35 ` Paul E. McKenney
2015-07-06 14:52 ` Peter Zijlstra
2015-06-30 21:48 ` [PATCH RFC tip/core/rcu 3/5] rcutorture: Ensure that normal GPs advance without " Paul E. McKenney
2015-06-30 21:48 ` [PATCH RFC tip/core/rcu 4/5] rcu: Wake grace-period kthread at end of expedited grace period Paul E. McKenney
2015-06-30 21:48 ` [PATCH RFC tip/core/rcu 5/5] rcu: Limit expedited helping to every 10 ms or every 4th GP Paul E. McKenney
2015-06-30 21:56 ` Eric Dumazet
2015-06-30 22:10 ` Paul E. McKenney
2015-07-01 10:07 ` Peter Zijlstra
2015-07-01 13:45 ` Paul E. McKenney
2015-07-01 19:30 ` Paul E. McKenney
2015-06-30 22:00 ` [PATCH RFC tip/core/rcu 0/5] Expedited grace periods encouraging normal ones josh
2015-06-30 22:12 ` Paul E. McKenney
2015-06-30 23:46 ` josh
2015-07-01 0:15 ` Paul E. McKenney
2015-07-01 0:42 ` Josh Triplett
2015-07-01 3:37 ` Paul E. McKenney
2015-07-01 10:12 ` Peter Zijlstra
2015-07-01 14:01 ` Paul E. McKenney
2015-07-01 14:08 ` Eric Dumazet
2015-07-01 15:58 ` Paul E. McKenney
2015-07-01 15:43 ` Josh Triplett
2015-07-01 15:59 ` Paul E. McKenney
2015-07-01 10:09 ` Peter Zijlstra
2015-07-01 10:55 ` Peter Zijlstra
2015-07-01 14:00 ` Paul E. McKenney
2015-07-01 14:17 ` Peter Zijlstra
2015-07-01 16:17 ` Paul E. McKenney
2015-07-01 17:02 ` Peter Zijlstra
2015-07-01 20:09 ` Paul E. McKenney
2015-07-01 21:20 ` josh
2015-07-01 21:49 ` Paul E. McKenney
2015-07-02 7:47 ` Ingo Molnar
2015-07-02 13:58 ` Paul E. McKenney
2015-07-02 18:35 ` Ingo Molnar
2015-07-02 18:47 ` Mathieu Desnoyers
2015-07-02 19:23 ` Paul E. McKenney
2015-07-02 21:07 ` Mathieu Desnoyers
2015-07-02 19:22 ` Paul E. McKenney
2015-07-02 1:11 ` Mike Galbraith
2015-07-02 1:34 ` josh
2015-07-02 1:59 ` Mike Galbraith
2015-07-02 2:18 ` Paul E. McKenney
2015-07-02 2:50 ` Mike Galbraith
2015-07-02 3:15 ` Paul E. McKenney [this message]
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