linux-kernel - Re: [PATCH 0/2] convert mmap_sem to a scalable rw

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Message-ID: <Pine.LNX.4.64.0705111008380.32716@schroedinger.engr.sgi.com>
Date:	Fri, 11 May 2007 10:08:56 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...sign.ru>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [PATCH 0/2] convert mmap_sem to a scalable rw_mutex

On Fri, 11 May 2007, Ingo Molnar wrote:

> given how nice this looks already, have you considered completely 
> replacing rwsems with this? I suspect you could test the correctness of 
> that without doing a mass API changeover, by embedding struct rw_mutex 
> in struct rwsem and implementing kernel/rwsem.c's API that way. (the 
> real patch would just flip it all over to rw-mutexes)

Ummmm... How much memory would that cost on large systems?

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