From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Lai Jiangshan <jiangshanlai@gmail.com>,
dipankar <dipankar@in.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Josh Triplett <josh@joshtriplett.org>,
Thomas Gleixner <tglx@linutronix.de>,
rostedt <rostedt@goodmis.org>,
David Howells <dhowells@redhat.com>,
Eric Dumazet <edumazet@google.com>, fweisbec <fweisbec@gmail.com>,
Oleg Nesterov <oleg@redhat.com>,
Will Deacon <will.deacon@arm.com>
Subject: Re: [PATCH tip/core/rcu 4/5] sys_membarrier: Add expedited option
Date: Thu, 27 Jul 2017 07:52:15 -0700 [thread overview]
Message-ID: <20170727145215.GA3730@linux.vnet.ibm.com> (raw)
In-Reply-To: <20170727102422.dgaq7qqkpikvue4l@hirez.programming.kicks-ass.net>
On Thu, Jul 27, 2017 at 12:24:22PM +0200, Peter Zijlstra wrote:
> On Wed, Jul 26, 2017 at 11:30:32AM -0700, Paul E. McKenney wrote:
> > The patch I posted reverts to synchronize_sched() in kernels booted with
> > rcupdate.rcu_normal=1. ;-)
>
> So boot parameters are no solution and are only slightly better than
> compile time switches.
>
> What if you have a machine that runs workloads that want both options?
> partitioning and containers are somewhat popular these days and system
> wide tunables don't work for them.
Agreed, these are disadvantages. And again, I will nevertheless be
carrying some variant of this patch until something better is in place,
where that something has been shown to satisfy the needs of the people
requesting this feature.
Thanx, Paul
next prev parent reply other threads:[~2017-07-27 14:52 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-24 21:57 [PATCH tip/core/rcu 0/5] Related non-RCU updates Paul E. McKenney
2017-07-24 21:58 ` [PATCH tip/core/rcu 1/5] module: Fix pr_fmt() bug for header use of printk Paul E. McKenney
2017-07-24 21:58 ` [PATCH tip/core/rcu 2/5] init_task: Remove redundant INIT_TASK_RCU_TREE_PREEMPT() macro Paul E. McKenney
2017-07-24 21:58 ` [PATCH tip/core/rcu 3/5] EXPERIMENTAL sched: Allow migrating kthreads into online but inactive CPUs Paul E. McKenney
2017-07-24 21:58 ` [PATCH tip/core/rcu 4/5] sys_membarrier: Add expedited option Paul E. McKenney
2017-07-25 4:27 ` Boqun Feng
2017-07-25 16:24 ` Paul E. McKenney
2017-07-25 13:21 ` Mathieu Desnoyers
2017-07-25 16:48 ` Paul E. McKenney
2017-07-25 16:33 ` Peter Zijlstra
2017-07-25 16:49 ` Paul E. McKenney
2017-07-25 16:59 ` Peter Zijlstra
2017-07-25 17:17 ` Paul E. McKenney
2017-07-25 18:53 ` Peter Zijlstra
2017-07-25 19:36 ` Paul E. McKenney
2017-07-25 20:24 ` Peter Zijlstra
2017-07-25 21:19 ` Paul E. McKenney
2017-07-25 21:55 ` Peter Zijlstra
2017-07-25 22:39 ` Mathieu Desnoyers
2017-07-25 22:50 ` Mathieu Desnoyers
2017-07-26 0:01 ` Paul E. McKenney
2017-07-26 7:46 ` Peter Zijlstra
2017-07-26 15:42 ` Paul E. McKenney
2017-07-26 18:01 ` Mathieu Desnoyers
2017-07-26 18:30 ` Paul E. McKenney
2017-07-26 20:37 ` Mathieu Desnoyers
2017-07-26 21:11 ` Paul E. McKenney
2017-07-27 1:45 ` Paul E. McKenney
2017-07-27 12:39 ` Mathieu Desnoyers
2017-07-27 14:44 ` Paul E. McKenney
2017-07-27 10:24 ` Peter Zijlstra
2017-07-27 14:52 ` Paul E. McKenney [this message]
2017-07-27 8:53 ` Peter Zijlstra
2017-07-27 10:09 ` Peter Zijlstra
2017-07-27 10:22 ` Will Deacon
2017-07-27 13:14 ` Paul E. McKenney
2017-07-25 23:59 ` Paul E. McKenney
2017-07-26 7:41 ` Peter Zijlstra
2017-07-26 15:41 ` Paul E. McKenney
2017-07-27 8:30 ` Peter Zijlstra
2017-07-27 13:08 ` Paul E. McKenney
2017-07-27 13:49 ` Peter Zijlstra
2017-07-27 14:32 ` Paul E. McKenney
2017-07-27 14:36 ` Peter Zijlstra
2017-07-27 14:46 ` Paul E. McKenney
2017-07-27 13:55 ` Boqun Feng
2017-07-27 14:16 ` Paul E. McKenney
2017-07-27 14:29 ` Boqun Feng
2017-07-27 14:36 ` Paul E. McKenney
2017-07-27 14:41 ` Will Deacon
2017-07-27 14:47 ` Boqun Feng
2017-07-27 14:55 ` Paul E. McKenney
2017-07-27 13:56 ` Peter Zijlstra
2017-07-27 15:19 ` Peter Zijlstra
2017-07-26 9:36 ` Will Deacon
2017-07-26 15:46 ` Paul E. McKenney
2017-07-27 10:14 ` Peter Zijlstra
2017-07-27 12:56 ` Paul E. McKenney
2017-07-27 13:37 ` Peter Zijlstra
2017-07-27 14:33 ` Paul E. McKenney
2017-07-24 21:58 ` [PATCH tip/core/rcu 5/5] EXP: sched/cputime: Fix using smp_processor_id() in preemptible Paul E. McKenney
2017-07-24 22:01 ` Wanpeng Li
2017-07-24 22:29 ` Paul E. McKenney
2017-07-31 22:51 ` [PATCH tip/core/rcu 0/5] Related non-RCU updates Paul E. McKenney
2017-07-31 22:53 ` [PATCH v2 tip/core/rcu 1/4] module: Fix pr_fmt() bug for header use of printk Paul E. McKenney
2017-07-31 22:53 ` [PATCH v2 tip/core/rcu 2/4] init_task: Remove redundant INIT_TASK_RCU_TREE_PREEMPT() macro Paul E. McKenney
2017-07-31 22:53 ` [PATCH v2 tip/core/rcu 3/4] sched: Allow migrating kthreads into online but inactive CPUs Paul E. McKenney
2017-07-31 22:53 ` [PATCH v2 tip/core/rcu 4/4] membarrier: Expedited private command Paul E. McKenney
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