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In-Reply-To: <20121113004906.GA10557@linux.vnet.ibm.com>
References: <20121113004906.GA10557@linux.vnet.ibm.com>
Date: Tue, 13 Nov 2012 02:12:27 +0100
Message-ID: <CAFTL4hyUBAAu_COi_V3aFr5j0eXZxnw48Hv8pe1cRTLO1eKYdA@mail.gmail.com>
Subject: Re: Does anyone use CONFIG_TINY_PREEMPT_RCU?
From: Frederic Weisbecker <fweisbec@gmail.com>
To: paulmck@linux.vnet.ibm.com
Cc: linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
        mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com,
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2012/11/13 Paul E. McKenney <paulmck@linux.vnet.ibm.com>:
> 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.

I don't use it personally but if you remove it, does that mean that
RCU couldn't be preemptible on UP?
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