linux-kernel - Re: Does anyone use CONFIG_TINY_PREEMPT

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Message-ID: <20121113170804.GA2489@linux.vnet.ibm.com>
Date:	Tue, 13 Nov 2012 09:08:04 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Nick Bowler <nbowler@...iptictech.com>
Cc:	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,
	josh@...htriplett.org, 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 09:46:20AM -0500, Nick Bowler wrote:
> On 2012-11-12 16:49 -0800, Paul E. McKenney wrote:
> > Hello!
> > 
> > I know of people using TINY_RCU, TREE_RCU, and TREE_PREEMPT_RCU, but I
> > have not heard of anyone using TINY_PREEMPT_RCU for whom TREE_PREEMPT_RCU
> > was not a viable option (in contrast, the people running Linux on
> > tiny-memmory systems typically use TINY_RCU).  Of course, if no one
> > really needs it, the proper thing to do is to remove it.
> > 
> > So, if you need TINY_PREEMPT_RCU, please let me know.  Otherwise, I will
> > remove it, probably in the 3.9 timeframe.
> 
> Yes, I use TINY_PREEMPT_RCU on my UP machines.  It is, in fact, the only
> option.

Suppose that TREE_PREEMPT_RCU was available for !SMP && PREEMPT builds.
Would that work for you?

							Thanx, Paul

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