From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
linux-kernel@vger.kernel.org,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Steven Rostedt <rostedt@goodmis.org>,
Nicholas Miell <nmiell@comcast.net>,
Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@redhat.com>,
Alan Cox <gnomes@lxorguk.ukuu.org.uk>,
Lai Jiangshan <laijs@cn.fujitsu.com>,
Stephen Hemminger <stephen@networkplumber.org>,
Andrew Morton <akpm@linux-foundation.org>,
Josh Triplett <josh@joshtriplett.org>,
Thomas Gleixner <tglx@linutronix.de>,
David Howells <dhowells@redhat.com>,
Nick Piggin <npiggin@kernel.dk>
Subject: Re: [RFC PATCH] sys_membarrier(): system/process-wide memory barrier (x86) (v12)
Date: Tue, 17 Mar 2015 05:01:10 -0700 [thread overview]
Message-ID: <20150317120110.GA10078@linux.vnet.ibm.com> (raw)
In-Reply-To: <20150317115608.GF3589@linux.vnet.ibm.com>
On Tue, Mar 17, 2015 at 04:56:08AM -0700, Paul E. McKenney wrote:
> On Tue, Mar 17, 2015 at 07:30:59AM +0100, Peter Zijlstra wrote:
> > On Tue, Mar 17, 2015 at 01:45:25AM +0000, Mathieu Desnoyers wrote:
>
> [ . . . ]
>
> > > Then we can add
> > > the expedited-private implementation after rq->curr becomes
> > > available through RCU.
> >
> > Yeah, or not at all; I'm still trying to get Paul to remove the
> > expedited nonsense from the kernel RCU bits; and now you want it in
> > userspace too :/
>
> Well, the expedited RCU primitives got added for some use cases, and
> those use cases are still with us. ;-)
And, as I was meaning to say -before- I hit send... I still have some
changes in mind to make the expedited RCU primitives at least somewhat
more friendly, for example, moving from try_stop_cpus() to something
like on_each_cpu_mask().
Thanx, Paul
next prev parent reply other threads:[~2015-03-17 12:14 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-15 19:24 [RFC PATCH] sys_membarrier(): system/process-wide memory barrier (x86) (v12) Mathieu Desnoyers
2015-03-15 22:05 ` Paul E. McKenney
2015-03-16 3:25 ` Josh Triplett
2015-03-16 13:00 ` Mathieu Desnoyers
2015-03-16 14:19 ` Peter Zijlstra
2015-03-16 14:24 ` Steven Rostedt
2015-03-16 15:49 ` Mathieu Desnoyers
2015-03-16 15:49 ` Paul E. McKenney
2015-03-16 16:12 ` Steven Rostedt
2015-03-16 15:43 ` Mathieu Desnoyers
2015-03-16 15:57 ` Mathieu Desnoyers
2015-03-16 17:13 ` Peter Zijlstra
2015-03-16 17:21 ` Peter Zijlstra
2015-03-16 18:53 ` Mathieu Desnoyers
2015-03-16 20:54 ` Peter Zijlstra
2015-03-17 1:45 ` Mathieu Desnoyers
2015-03-17 2:26 ` Steven Rostedt
2015-03-17 6:40 ` Peter Zijlstra
2015-03-17 11:44 ` Paul E. McKenney
2015-03-17 14:10 ` Steven Rostedt
2015-03-17 16:35 ` Paul E. McKenney
2015-03-17 12:46 ` Mathieu Desnoyers
2015-03-18 1:06 ` Steven Rostedt
2015-03-17 6:30 ` Peter Zijlstra
2015-03-17 11:56 ` Paul E. McKenney
2015-03-17 12:01 ` Paul E. McKenney [this message]
2015-03-17 13:13 ` Mathieu Desnoyers
2015-03-17 16:36 ` Mathieu Desnoyers
2015-03-17 16:48 ` Paul E. McKenney
2015-03-17 17:55 ` josh
2015-03-17 16:37 ` Peter Zijlstra
2015-03-17 16:49 ` Paul E. McKenney
2015-03-17 17:00 ` Peter Zijlstra
2015-03-16 17:24 ` Peter Zijlstra
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