From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>,
linux-kernel@vger.kernel.org, mingo@elte.hu,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca,
josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de,
rostedt@goodmis.org, Valdis.Kletnieks@vt.edu,
dhowells@redhat.com, eric.dumazet@gmail.com, darren@dvhart.com
Subject: Re: [PATCH RFC tip/core/rcu 13/20] rcu: increase synchronize_sched_expedited() batching
Date: Mon, 20 Dec 2010 23:58:28 -0800 [thread overview]
Message-ID: <20101221075828.GJ2143@linux.vnet.ibm.com> (raw)
In-Reply-To: <1292841080.2708.134.camel@laptop>
On Mon, Dec 20, 2010 at 11:31:20AM +0100, Peter Zijlstra wrote:
> On Sun, 2010-12-19 at 10:43 +0100, Tejun Heo wrote:
> >
> > I see, then would something like the following work?
> >
> > (int)((unsigned)(a) - (unsigned)(b)) < 0
>
> Note that there is lots of kernel code that does the above and
> variations thereof and expects it to work.
Given that the approach I have been using is the same number of lines
and avoids relying on this expectation, I will stick with it.
Thanx, Paul
next prev parent reply other threads:[~2010-12-21 7:58 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-17 20:54 [PATCH tip/core/rcu 0/20] second preview of RCU patches for 2.6.38 Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 01/20] rcu: add priority-inversion testing to rcutorture Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 02/20] rcu: move TINY_RCU from softirq to kthread Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 03/20] rcu: priority boosting for TINY_PREEMPT_RCU Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 04/20] rcu: add tracing for TINY_RCU and TINY_PREEMPT_RCU Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 05/20] rcu: document TINY_RCU and TINY_PREEMPT_RCU tracing Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 06/20] rcu: Distinguish between boosting and boosted Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 07/20] rcu: get rid of obsolete "classic" names in TREE_RCU tracing Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 08/20] rcu,cleanup: move synchronize_sched_expedited() out of sched.c Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 09/20] rcu,cleanup: simplify the code when cpu is dying Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 10/20] rcu: update documentation/comments for Lai's adoption patch Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 11/20] rcu: fix race condition in synchronize_sched_expedited() Paul E. McKenney
2010-12-18 15:52 ` Tejun Heo
2010-12-18 19:58 ` Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 12/20] rcu: Make synchronize_srcu_expedited() fast if running readers Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 13/20] rcu: increase synchronize_sched_expedited() batching Paul E. McKenney
2010-12-18 16:13 ` Tejun Heo
2010-12-18 20:14 ` Paul E. McKenney
2010-12-19 9:43 ` Tejun Heo
2010-12-19 16:35 ` Paul E. McKenney
2010-12-20 10:33 ` Peter Zijlstra
2010-12-20 13:40 ` Mathieu Desnoyers
2010-12-20 10:31 ` Peter Zijlstra
2010-12-21 7:58 ` Paul E. McKenney [this message]
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 14/20] rcu: Stop chasing QS if another CPU did it for us Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 15/20] rcu: Keep gpnum and completed fields synchronized Paul E. McKenney
2010-12-20 2:13 ` Lai Jiangshan
2010-12-20 2:14 ` Frederic Weisbecker
2010-12-20 16:51 ` Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 16/20] rcu: fine-tune grace-period begin/end checks Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 17/20] rcu: limit rcu_node leaf-level fanout Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 18/20] rcu: reduce __call_rcu()-induced contention on rcu_node structures Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 19/20] rculist: fix borked __list_for_each_rcu() macro Paul E. McKenney
2010-12-17 20:54 ` [PATCH RFC tip/core/rcu 20/20] rcu: remove unused " Paul E. McKenney
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