linux-kernel - Re: [PATCH RFC tip/core/rcu 1/9] rcu: Add call_rcu

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Message-ID: <20140801151641.GG4784@linux.vnet.ibm.com>
Date:	Fri, 1 Aug 2014 08:16:42 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	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, rostedt@...dmis.org,
	dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com,
	fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com
Subject: Re: [PATCH RFC tip/core/rcu 1/9] rcu: Add call_rcu_tasks()

On Fri, Aug 01, 2014 at 04:59:35AM +0200, Mike Galbraith wrote:
> On Thu, 2014-07-31 at 09:38 -0700, Paul E. McKenney wrote:
> 
> > Does building with CONFIG_NO_HZ_FULL_SYSIDLE=y slow things down even more?
> > If so, that would give me a rough idea of the cost of RCU's dyntick-idle
> > handling.
> 
> Nope.  Deltas are all down in the statistical frog hair.

OK, then I guess that trying to squeeze down RCU's dyntick-idle detection
won't be much help.  Worth a thought, though, and thank you for running
the tests!

							Thanx, Paul

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