Date: Tue, 13 Nov 2012 09:08:04 -0800
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Nick Bowler <nbowler@elliptictech.com>
Cc: linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
        mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com,
        akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
        josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de,
        peterz@infradead.org, rostedt@goodmis.org, Valdis.Kletnieks@vt.edu,
        dhowells@redhat.com, edumazet@google.com, darren@dvhart.com,
        fweisbec@gmail.com, sbw@mit.edu, patches@linaro.org
Subject: Re: Does anyone use CONFIG_TINY_PREEMPT_RCU?
Message-ID: <20121113170804.GA2489@linux.vnet.ibm.com>
Reply-To: paulmck@linux.vnet.ibm.com
References: <20121113004906.GA10557@linux.vnet.ibm.com>
 <20121113144620.GA27426@elliptictech.com>
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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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