linux-kernel - Re: [PATCH, RFC] v6 scalable classic RCU implementation

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Message-ID: <20080925140506.GA6725@linux.vnet.ibm.com>
Date:	Thu, 25 Sep 2008 07:05:06 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, cl@...ux-foundation.org,
	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, peterz@...radead.org,
	penberg@...helsinki.fi, andi@...stfloor.org, tglx@...utronix.com
Subject: Re: [PATCH, RFC] v6 scalable classic RCU implementation

On Thu, Sep 25, 2008 at 09:26:07AM +0200, Ingo Molnar wrote:
> 
> * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:
> 
> > +config RCU_CPU_STALL_DETECTOR
> > +	bool "Check for stalled CPUs delaying RCU grace periods"
> > +	depends on CLASSIC_RCU || TREE_RCU
> > +	default n
> > +	help
> > +	  This option causes RCU to printk information on which
> > +	  CPUs are delaying the current grace period, but only when
> > +	  the grace period extends for excessive time periods.
> > +
> > +	  Say Y if you want RCU to perform such checks.
> > +
> > +	  Say N if you are unsure.
> 
> could you please send this bit separately, even if rcutree isnt finished 
> yet? Seems like a quite useful debug feature.

Good point -- I guess I do need to implement the CLASSIC_RCU piece of
this in any case.

							Thanx, Paul
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