linux-kernel - Re: Does anyone use CONFIG_TINY_PREEMPT

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Message-ID: <20121114010703.GR2489@linux.vnet.ibm.com>
Date:	Tue, 13 Nov 2012 17:07:03 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	Tim Sander <tim01@...i.informatik.tu-darmstadt.de>,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com,
	edumazet@...gle.com, darren@...art.com, fweisbec@...il.com,
	sbw@....edu, patches@...aro.org
Subject: Re: Does anyone use CONFIG_TINY_PREEMPT_RCU?

On Tue, Nov 13, 2012 at 04:36:42PM -0800, Josh Triplett wrote:
> On Tue, Nov 13, 2012 at 04:06:48PM -0800, Paul E. McKenney wrote:
> > On Wed, Nov 14, 2012 at 12:32:36AM +0100, Tim Sander wrote:
> > > Hi Paul
> > > 
> > > Sorry english somehow i tried to shoehorn more than one sentence into one 
> > > sentence in the last mail.
> > > > OK, how much memory does your device have?
> > > It's 128Mb of memory.
> > 
> > That is a bit on the smaller side.  But still quite large compared
> > to the 15K difference between CONFIG_TREE_PREEMPT_RCU and
> > CONFIG_TINY_PREEMPT_RCU.
> 
> I'd also expect CONFIG_TINY_PREEMPT_RCU to have marginally more
> performance on a UP system, but probably not enough to matter.

Agreed, I would expect this to be down in the noise.

							Thanx, Paul

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