linux-kernel - Re: [PATCH RFC tip/core/rcu 2/2] Don't track sysidle state if no nohz

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Message-ID: <20140724145842.GB25788@localhost.localdomain>
Date:	Thu, 24 Jul 2014 16:58:45 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
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,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	dvhart@...ux.intel.com, oleg@...hat.com, bobby.prani@...il.com
Subject: Re: [PATCH RFC tip/core/rcu 2/2] Don't track sysidle state if no
 nohz_full= CPUs

On Wed, Jul 23, 2014 at 09:29:51AM -0700, Paul E. McKenney wrote:
> If there are no nohz_full= CPUs, then there is currently no reason to
> track sysidle state.  This commit therefore short-circuits this state
> tracking if !tick_nohz_full_enabled().
> 
> Note that these checks will need to be revisited if nohz_full= state
> can ever be changed at runtime.
> 
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

Acked-by: Frederic Weisbecker <fweisbec@...il.com>
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