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Message-Id: <1220088780.8426.1.camel@twins>
Date: Sat, 30 Aug 2008 11:33:00 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: paulmck@...ux.vnet.ibm.com
Cc: linux-kernel@...r.kernel.org, cl@...ux-foundation.org,
mingo@...e.hu, akpm@...ux-foundation.org, manfred@...orfullife.com,
dipankar@...ibm.com, josht@...ux.vnet.ibm.com, schamp@....com,
niv@...ibm.com, dvhltc@...ibm.com, ego@...ibm.com,
laijs@...fujitsu.com, rostedt@...dmis.org,
Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Subject: Re: [PATCH, RFC, tip/core/rcu] v3 scalable classic RCU
implementation
On Fri, 2008-08-29 at 17:49 -0700, Paul E. McKenney wrote:
> Some shortcomings:
>
> o Entering and leaving dynticks idle mode is a quiescent state,
> but the current patch doesn't take advantage of this (noted
> by Manfred). It appears that it should be possible to make
> nmi_enter() and nmi_exit() provide an in_nmi(), which would make
> it possible for rcu_irq_enter() and rcu_irq_exit() to figure
> out whether it is safe to tell RCU about the quiescent state --
> and also greatly simplify the code.
Already done and available in the -tip tree, curtesy of Mathieu.
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