linux-kernel - Re: [PATCH tip/core/rcu 0/4] rcu: preemptible expedited grace periods and cleanups

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Date:	Thu, 03 Dec 2009 16:53:13 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	paulmck@...ux.vnet.ibm.com
CC:	linux-kernel@...r.kernel.org, mingo@...e.hu, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, dvhltc@...ibm.com, niv@...ibm.com,
	tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com
Subject: Re: [PATCH tip/core/rcu 0/4] rcu: preemptible expedited grace periods
 and cleanups

Paul E. McKenney wrote:
> This patchset includes some cleanups, improved diagnostics, and an
> implementation of expedited preemptible RCU grace periods that is
> actually expedited:
> 
> 1.	Rename the "quiet" functions.  The name rcu_quiet_cpu() was
> 	clear enough, but now that we have four flavors of quietness
> 	with more on the way, we need more meaningful names.
> 
> 2.	Enable a fourth level of the rcu_node hierarchy.  No, we really
> 	don't need the ability to run on million-CPU SMP systems at the
> 	moment, but the additional level allows more vigorous
> 	stress-testing on 16-CPU systems.
> 
> 3.	Add an implementation of synchronize_rcu_expedited() that
> 	actually expedites preemptible-RCU grace periods.
> 
> 4.	Make RCU_CPU_STALL_DETECTOR be on by default.  If this works
> 	well, the #ifdefs will eventually be removed to reduce testing
> 	load.
> 
> This patchset is intended for 2.6.34, but has passed sufficient testing
> that it could safely be included in 2.6.33, if desired.
> 

Ack for the whole patchset except [PATCH 3/4]

Acked-by: Lai Jiangshan <laijs@...fujitsu.com>
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