linux-kernel - Re: [PATCH tip/core/rcu 24/24] rcu: Conditionally compile RCU's eqs warnings

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Message-ID: <20150513150625.GF6776@linux.vnet.ibm.com>
Date:	Wed, 13 May 2015 08:06:25 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
	dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com,
	fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com
Subject: Re: [PATCH tip/core/rcu 24/24] rcu: Conditionally compile RCU's eqs
 warnings

On Wed, May 13, 2015 at 09:46:48AM -0400, Steven Rostedt wrote:
> On Tue, 12 May 2015 15:30:54 -0700
> "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:
> 
> > --- a/lib/Kconfig.debug
> > +++ b/lib/Kconfig.debug
> > @@ -1373,6 +1373,17 @@ config RCU_TRACE
> >  	  Say Y here if you want to enable RCU tracing
> >  	  Say N if you are unsure.
> >  
> > +config RCU_EQS_DEBUG
> > +	bool "Use this when adding any sort of NO_HZ support to your arch"
> > +	depends on DEBUG_KERNEL
> 
> Should we add "depends on NO_HZ" ?

No, because RCU now uses the EQS code even for NO_HZ_PERIODIC to detect
idle time.

							Thanx, Paul

> -- Steve
> 
> > +	help
> > +	  This option provides consistency checks in RCU's handling of
> > +	  NO_HZ.  These checks have proven quite helpful in detecting
> > +	  bugs in arch-specific NO_HZ code.
> > +
> > +	  Say N here if you need ultimate kernel/user switch latencies
> > +	  Say Y if you are unsure
> > +
> >  endmenu # "RCU Debugging"
> >  
> >  config DEBUG_BLOCK_EXT_DEVT
> 

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