linux-kernel - Re: [PATCH, RFC, tip/core/rcu] v3 scalable classic RCU implementation

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Message-ID: <20080830141001.GD7107@linux.vnet.ibm.com>
Date:	Sat, 30 Aug 2008 07:10:01 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
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 Sat, Aug 30, 2008 at 11:33:00AM +0200, Peter Zijlstra wrote:
> 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.

Very cool!!!  I see one of his patches at http://lkml.org/lkml/2008/4/17/342,
but how do I find out which branch of -tip this is on?  (I am learning
git, but it is a slow process...)

This would also simplify preemptable RCU's dyntick interface, removing
the need for proofs.

							Thanx, Paul
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