From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org, mingo@kernel.org,
jiangshanlai@gmail.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
josh@joshtriplett.org, tglx@linutronix.de, rostedt@goodmis.org,
dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com,
oleg@redhat.com, will.deacon@arm.com
Subject: Re: [PATCH tip/core/rcu 4/5] sys_membarrier: Add expedited option
Date: Thu, 27 Jul 2017 07:46:34 -0700 [thread overview]
Message-ID: <20170727144634.GY3730@linux.vnet.ibm.com> (raw)
In-Reply-To: <20170727143624.oghezky7owivouy7@hirez.programming.kicks-ass.net>
On Thu, Jul 27, 2017 at 04:36:24PM +0200, Peter Zijlstra wrote:
> On Thu, Jul 27, 2017 at 07:32:05AM -0700, Paul E. McKenney wrote:
> > > as per your proposed patch, will spray IPIs to all CPUs and at high
> > > rates.
> >
> > OK, I have updated my patch to do throttling.
>
> But not respect cpusets. Which is the other important point.
>
> The scheduler based IPIs are limited to where we are allowed to place
> tasks (as are the TLB ones for that matter, for the exact same reason).
Yes, these are disadvantages, no argument there. But I will nevertheless
be carrying some variant of this patch until something better exists,
including that something being tested and found satisfactory by the
various people asking for this.
Thanx, Paul
next prev parent reply other threads:[~2017-07-27 14:46 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
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 [this message]
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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