From mboxrd@z Thu Jan  1 00:00:00 1970
From: John Sigler <linux.kernel@free.fr>
Subject: Re: [PATCH 3/4 RFC] RCU: preemptible RCU
Date: Wed, 08 Aug 2007 11:10:32 +0200
Message-ID: <46B98888.6030600@free.fr>
References: <20070807183946.GA32110@linux.vnet.ibm.com> <20070807184812.GC10068@linux.vnet.ibm.com>
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Paul E. McKenney wrote:

> This patch was developed as a part of the -rt kernel development and
> meant to provide better latencies when read-side critical sections of
> RCU don't disable preemption.  As a consequence of keeping track of RCU
> readers, the readers have a slight overhead (optimizations in the paper).
> This implementation co-exists with the "classic" RCU implementations
> and can be switched to at compiler.

I cannot parse the last sentence :-)

Did you mean that this new implementation can be chosen (over the 
classic implementation) at compile-time?

Regards.