linux-kernel - Re: [patch] generic rwsems

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Message-ID: <20070413121348.GA28335@infradead.org>
Date:	Fri, 13 Apr 2007 13:13:48 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	David Howells <dhowells@...hat.com>
Cc:	Nick Piggin <npiggin@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch] generic rwsems

On Fri, Apr 13, 2007 at 12:44:50PM +0100, David Howells wrote:
> Nick Piggin <npiggin@...e.de> wrote:
> 
> > I think I should put wait_lock after wait_list, so as to get a better
> > packing on most 64-bit architectures.
> 
> It makes no difference.  struct lockdep_map contains at least one pointer and
> so is going to be 8-byte aligned (assuming it's there at all).  struct
> rw_semaphore contains at least one pointer/long, so it will be padded out to
> 8-byte size.

I hope people are not going to enabled lockdep on their production systems :)

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