From: Peter Zijlstra <peterz@infradead.org>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Oleg Nesterov <oleg@redhat.com>,
linux-kernel@vger.kernel.org, mingo@kernel.org,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
josh@joshtriplett.org, tglx@linutronix.de, dhowells@redhat.com,
edumazet@google.com, dvhart@linux.intel.com, fweisbec@gmail.com,
bobby.prani@gmail.com
Subject: Re: [PATCH v3 tip/core/rcu 3/9] rcu: Add synchronous grace-period waiting for RCU-tasks
Date: Thu, 7 Aug 2014 20:46:35 +0200 [thread overview]
Message-ID: <20140807184635.GI3588@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20140807172753.GG3588@twins.programming.kicks-ass.net>
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On Thu, Aug 07, 2014 at 07:27:53PM +0200, Peter Zijlstra wrote:
> Right, Steve (and Paul) please explain _why_ this is an 'RCU' at all?
> _Why_ do we have call_rcu_task(), and why is it entwined in the 'normal'
> RCU stuff? We've got SRCU -- which btw started out simple, without
> call_srcu() -- and that lives entirely independent. And SRCU is far more
> an actual RCU than this thing is, its got read side primitives and
> everything.
>
> Also, I cannot think of any other use besides trampolines for this
> thing, but that might be my limited imagination.
Also, trampolines can end up in the return frames, right? So how can you
be sure when to wipe them? Passing through schedule() isn't enough for
that.
Userspace is, but kernel threads typically don't ever end up there.
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next prev parent reply other threads:[~2014-08-07 18:46 UTC|newest]
Thread overview: 122+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-31 21:54 [PATCH v3 tip/core/rcu 0/9 Paul E. McKenney
2014-07-31 21:55 ` [PATCH v3 tip/core/rcu 1/9] rcu: Add call_rcu_tasks() Paul E. McKenney
2014-07-31 21:55 ` [PATCH v3 tip/core/rcu 2/9] rcu: Provide cond_resched_rcu_qs() to force quiescent states in long loops Paul E. McKenney
2014-07-31 21:55 ` [PATCH v3 tip/core/rcu 3/9] rcu: Add synchronous grace-period waiting for RCU-tasks Paul E. McKenney
2014-08-01 15:09 ` Oleg Nesterov
2014-08-01 18:32 ` Paul E. McKenney
2014-08-01 19:44 ` Paul E. McKenney
2014-08-02 14:47 ` Oleg Nesterov
2014-08-02 22:58 ` Paul E. McKenney
2014-08-06 0:57 ` Steven Rostedt
2014-08-06 1:21 ` Paul E. McKenney
2014-08-06 8:47 ` Peter Zijlstra
2014-08-06 12:09 ` Paul E. McKenney
2014-08-06 16:30 ` Peter Zijlstra
2014-08-06 22:45 ` Paul E. McKenney
2014-08-07 8:45 ` Peter Zijlstra
2014-08-07 15:00 ` Paul E. McKenney
2014-08-07 15:26 ` Peter Zijlstra
2014-08-07 17:27 ` Peter Zijlstra
2014-08-07 18:46 ` Peter Zijlstra [this message]
2014-08-07 19:49 ` Steven Rostedt
2014-08-07 19:53 ` Steven Rostedt
2014-08-07 20:08 ` Peter Zijlstra
2014-08-07 21:18 ` Steven Rostedt
2014-08-08 6:40 ` Peter Zijlstra
2014-08-08 14:12 ` Steven Rostedt
2014-08-08 14:28 ` Paul E. McKenney
2014-08-09 10:56 ` Masami Hiramatsu
2014-08-08 14:34 ` Peter Zijlstra
2014-08-08 14:58 ` Steven Rostedt
2014-08-08 15:16 ` Peter Zijlstra
2014-08-08 15:39 ` Steven Rostedt
2014-08-08 16:01 ` Peter Zijlstra
2014-08-08 16:10 ` Steven Rostedt
2014-08-08 16:17 ` Peter Zijlstra
2014-08-08 16:40 ` Steven Rostedt
2014-08-08 16:52 ` Peter Zijlstra
2014-08-08 16:27 ` Peter Zijlstra
2014-08-08 16:39 ` Paul E. McKenney
2014-08-08 16:49 ` Steven Rostedt
2014-08-08 16:51 ` Peter Zijlstra
2014-08-08 17:09 ` Paul E. McKenney
2014-08-08 16:43 ` Steven Rostedt
2014-08-08 16:50 ` Peter Zijlstra
2014-08-08 17:27 ` Steven Rostedt
2014-08-09 10:36 ` Masami Hiramatsu
2014-08-07 20:06 ` Peter Zijlstra
2014-07-31 21:55 ` [PATCH v3 tip/core/rcu 4/9] rcu: Export RCU-tasks APIs to GPL modules Paul E. McKenney
2014-07-31 21:55 ` [PATCH v3 tip/core/rcu 5/9] rcutorture: Add torture tests for RCU-tasks Paul E. McKenney
2014-07-31 21:55 ` [PATCH v3 tip/core/rcu 6/9] rcutorture: Add RCU-tasks test cases Paul E. McKenney
2014-07-31 21:55 ` [PATCH v3 tip/core/rcu 7/9] rcu: Add stall-warning checks for RCU-tasks Paul E. McKenney
2014-07-31 21:55 ` [PATCH v3 tip/core/rcu 8/9] rcu: Improve RCU-tasks energy efficiency Paul E. McKenney
2014-07-31 21:55 ` [PATCH v3 tip/core/rcu 9/9] documentation: Add verbiage on RCU-tasks stall warning messages Paul E. McKenney
2014-07-31 23:57 ` [PATCH v3 tip/core/rcu 1/9] rcu: Add call_rcu_tasks() Frederic Weisbecker
2014-08-01 2:04 ` Paul E. McKenney
2014-08-01 15:06 ` Frederic Weisbecker
2014-08-01 1:15 ` Lai Jiangshan
2014-08-01 1:59 ` Paul E. McKenney
2014-08-01 1:31 ` Lai Jiangshan
2014-08-01 2:11 ` Paul E. McKenney
2014-08-01 14:11 ` Oleg Nesterov
2014-08-01 18:28 ` Paul E. McKenney
2014-08-01 18:40 ` Oleg Nesterov
2014-08-02 23:00 ` Paul E. McKenney
2014-08-03 12:57 ` Oleg Nesterov
2014-08-03 22:03 ` Paul E. McKenney
2014-08-04 13:29 ` Oleg Nesterov
2014-08-04 13:48 ` Paul E. McKenney
2014-08-01 18:57 ` Oleg Nesterov
2014-08-02 22:50 ` Paul E. McKenney
2014-08-02 14:56 ` Oleg Nesterov
2014-08-02 22:57 ` Paul E. McKenney
2014-08-03 13:33 ` Oleg Nesterov
2014-08-03 22:05 ` Paul E. McKenney
2014-08-04 0:37 ` Lai Jiangshan
2014-08-04 1:09 ` Paul E. McKenney
2014-08-04 13:25 ` Oleg Nesterov
2014-08-04 13:51 ` Paul E. McKenney
2014-08-04 13:52 ` Paul E. McKenney
2014-08-04 13:32 ` Oleg Nesterov
2014-08-04 19:28 ` Paul E. McKenney
2014-08-04 19:32 ` Oleg Nesterov
2014-08-04 1:28 ` Lai Jiangshan
2014-08-04 7:46 ` Peter Zijlstra
2014-08-04 8:18 ` Lai Jiangshan
2014-08-04 11:50 ` Paul E. McKenney
2014-08-04 12:25 ` Peter Zijlstra
2014-08-04 12:37 ` Paul E. McKenney
2014-08-04 14:56 ` Peter Zijlstra
2014-08-05 0:47 ` Lai Jiangshan
2014-08-05 21:55 ` Paul E. McKenney
2014-08-06 0:27 ` Lai Jiangshan
2014-08-06 0:48 ` Paul E. McKenney
2014-08-06 0:33 ` Lai Jiangshan
2014-08-06 0:51 ` Paul E. McKenney
2014-08-06 22:48 ` Paul E. McKenney
2014-08-07 8:49 ` Peter Zijlstra
2014-08-07 15:43 ` Paul E. McKenney
2014-08-07 16:32 ` Peter Zijlstra
2014-08-07 17:48 ` Paul E. McKenney
2014-08-08 19:13 ` Peter Zijlstra
2014-08-08 20:58 ` Paul E. McKenney
2014-08-09 6:15 ` Peter Zijlstra
2014-08-09 12:44 ` Steven Rostedt
2014-08-09 16:05 ` Paul E. McKenney
2014-08-09 16:01 ` Paul E. McKenney
2014-08-09 18:19 ` Peter Zijlstra
2014-08-09 18:24 ` Peter Zijlstra
2014-08-10 1:29 ` Paul E. McKenney
2014-08-10 8:14 ` Peter Zijlstra
2014-08-11 3:30 ` Paul E. McKenney
2014-08-11 11:57 ` Peter Zijlstra
2014-08-11 16:15 ` Paul E. McKenney
2014-08-10 1:26 ` Paul E. McKenney
2014-08-10 8:12 ` Peter Zijlstra
2014-08-10 16:46 ` Peter Zijlstra
2014-08-11 3:28 ` Paul E. McKenney
2014-08-11 3:23 ` Paul E. McKenney
2014-08-09 18:33 ` Peter Zijlstra
2014-08-10 1:38 ` Paul E. McKenney
2014-08-10 15:00 ` Peter Zijlstra
2014-08-11 3:37 ` Paul E. McKenney
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