From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Steven Rostedt <rostedt@goodmis.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, peterz@infradead.org,
dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com,
oleg@redhat.com
Subject: Re: [PATCH tip/core/rcu 02/15] rcu: Use timer as backstop for NOCB deferred wakeups
Date: Thu, 27 Jul 2017 10:33:51 -0700 [thread overview]
Message-ID: <20170727173351.GF3730@linux.vnet.ibm.com> (raw)
In-Reply-To: <20170726190934.1807e761@vmware.local.home>
On Wed, Jul 26, 2017 at 07:09:34PM -0400, Steven Rostedt wrote:
> On Wed, 26 Jul 2017 14:47:41 -0700
> "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:
>
>
> > > It is much lighter weight than a timer setup.
> >
> > How much lighter weight? In other words, what fraction of the
> > timers have to avoid being cancelled for irq_work to break even?
>
> No idea. I guess that would be a nice academic exercise ;-)
Hmmm... I guess I should try it and see what it does, though that
would be some merge window after the upcoming one. If it is indeed
simpler, I might forgive some possible performance shortcomings...
Thanx, Paul
next prev parent reply other threads:[~2017-07-27 17:33 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-24 21:44 [PATCH tip/core/rcu 0/15] General fixes Paul E. McKenney
2017-07-24 21:44 ` [PATCH tip/core/rcu 01/15] sched,rcu: Make cond_resched() provide RCU quiescent state Paul E. McKenney
2017-08-15 16:19 ` [PATCH v5 " Paul E. McKenney
2017-08-17 8:22 ` Ingo Molnar
2017-08-17 12:40 ` Paul E. McKenney
2017-07-24 21:44 ` [PATCH tip/core/rcu 02/15] rcu: Use timer as backstop for NOCB deferred wakeups Paul E. McKenney
2017-07-25 18:12 ` Steven Rostedt
2017-07-25 19:18 ` Paul E. McKenney
2017-07-25 22:17 ` Steven Rostedt
2017-07-26 0:05 ` Paul E. McKenney
2017-07-26 21:18 ` Steven Rostedt
2017-07-26 21:47 ` Paul E. McKenney
2017-07-26 23:09 ` Steven Rostedt
2017-07-27 17:33 ` Paul E. McKenney [this message]
2017-07-24 21:44 ` [PATCH tip/core/rcu 03/15] rcu: Drive TASKS_RCU directly off of PREEMPT Paul E. McKenney
2017-07-25 18:14 ` Steven Rostedt
2017-07-25 19:19 ` Paul E. McKenney
2017-07-24 21:44 ` [PATCH tip/core/rcu 04/15] rcu: Create reasonable API for do_exit() TASKS_RCU processing Paul E. McKenney
2017-07-24 21:44 ` [PATCH tip/core/rcu 05/15] rcu: Add TPS() to event-traced strings Paul E. McKenney
2017-07-28 1:32 ` Steven Rostedt
2017-07-24 21:44 ` [PATCH tip/core/rcu 06/15] rcu: Move rcu.h to new trivial-function style Paul E. McKenney
2017-07-24 21:44 ` [PATCH tip/core/rcu 07/15] rcu: Add event tracing to ->gp_tasks update at GP start Paul E. McKenney
2017-07-28 1:38 ` Steven Rostedt
2017-07-28 3:22 ` Paul E. McKenney
2017-07-28 12:18 ` Steven Rostedt
2017-07-28 17:13 ` Paul E. McKenney
2017-07-24 21:44 ` [PATCH tip/core/rcu 08/15] swait: add idle variants which don't contribute to load average Paul E. McKenney
2017-07-24 21:44 ` [PATCH tip/core/rcu 09/15] rcu: use idle versions of swait to make idle-hack clear Paul E. McKenney
2017-07-24 21:44 ` [PATCH tip/core/rcu 10/15] rcu: Add TPS() protection for _rcu_barrier_trace strings Paul E. McKenney
2017-07-28 1:40 ` Steven Rostedt
2017-07-24 21:44 ` [PATCH tip/core/rcu 11/15] rcu/tracing: Set disable_rcu_irq_enter on rcu_eqs_exit() Paul E. McKenney
2017-07-24 21:44 ` [PATCH tip/core/rcu 12/15] rcu: Add assertions verifying blocked-tasks list Paul E. McKenney
2017-07-24 21:44 ` [PATCH tip/core/rcu 13/15] rcu: Make rcu_idle_enter() rely on callers disabling irqs Paul E. McKenney
2017-07-24 21:44 ` [PATCH tip/core/rcu 14/15] rcu: Add warning to rcu_idle_enter() for irqs enabled Paul E. McKenney
2017-07-24 21:44 ` [PATCH tip/core/rcu 15/15] rcu: Remove exports from rcu_idle_exit() and rcu_idle_enter() Paul E. McKenney
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