linux-kernel - Re: [PATCH -mm] percpu_rw_semaphore-reimplement-to-not-block-the-readers-unnecessari ly.fix

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Message-Id: <20121116152219.d4acc6d0.akpm@linux-foundation.org>
Date:	Fri, 16 Nov 2012 15:22:19 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Mikulas Patocka <mpatocka@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm]
 percpu_rw_semaphore-reimplement-to-not-block-the-readers-unnecessari ly.fix

On Sun, 11 Nov 2012 19:27:44 +0100
Oleg Nesterov <oleg@...hat.com> wrote:

>  lib/percpu-rwsem.c |   35 +++++++++++++++++++++++++++++++++--

y'know, this looks like a great pile of useless bloat for single-CPU
machines.  Maybe add a CONFIG_SMP=n variant which simply calls the
regular rwsem operations?


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