linux-kernel - Re: Does anyone use CONFIG_TINY_PREEMPT

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Message-ID: <CAFTL4hyUBAAu_COi_V3aFr5j0eXZxnw48Hv8pe1cRTLO1eKYdA@mail.gmail.com>
Date:	Tue, 13 Nov 2012 02:12:27 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	paulmck@...ux.vnet.ibm.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,
	sbw@....edu, patches@...aro.org
Subject: Re: Does anyone use CONFIG_TINY_PREEMPT_RCU?

2012/11/13 Paul E. McKenney <paulmck@...ux.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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