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From: David Howells <dhowells@redhat.com>
To: Nick Piggin <npiggin@suse.de>
Cc: David Howells <dhowells@redhat.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-arch@vger.kernel.org, Linus Torvalds <torvalds@osdl.org>,
	Andrew Morton <akpm@osdl.org>
Subject: Re: [patch][rfc] rwsem: generic rwsem
Date: Fri, 08 Dec 2006 13:58:42 +0000	[thread overview]
Message-ID: <4548.1165586322@redhat.com> (raw)
In-Reply-To: <20061208022259.GB11551@wotan.suse.de>

Nick Piggin <npiggin@suse.de> wrote:

> > Look at how the counter works in the XADD-based version.  That's the way
> > it is *because* I'm using XADD.  That's quite limiting.
> 
> Not really. ll/sc architectures "emulate" xadd the same as they would
> emulate a spinlock. There is nothing suboptimal about it.

Yes, really.  You've missed the point entirely.  Look at *how* the counter
*works*.

David

  reply	other threads:[~2006-12-08 13:58 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-12-04 10:06 [patch][rfc] rwsem: generic rwsem Nick Piggin
2006-12-04 10:25 ` Nick Piggin
2006-12-04 12:55 ` David Howells
2006-12-04 14:46   ` Nick Piggin
2006-12-05 20:36     ` David Howells
2006-12-05 20:36       ` David Howells
2006-12-08  2:22       ` Nick Piggin
2006-12-08 13:58         ` David Howells [this message]
2006-12-11  4:03           ` Nick Piggin

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