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Date:	Tue, 5 Aug 2008 14:46:52 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Switching TestSetPageLocked to trylock_page

On Tuesday 05 August 2008 14:25, Linus Torvalds wrote:
> On Tue, 5 Aug 2008, Nick Piggin wrote:
> > The part that helps x86 is another patch further down my stack, which
> > can avoid looking at the hashed page waitqueue at unlock_page-time.
> > Basically this eliminates the entire page waitqueue from the cache
> > footprint of fastpath workloads where the lock is uncontended (often:
> > page faulting, write(2), writeout etc).
>
> Hmm. Tell me more. Contention bit?

Exactly. This is around the latest one online from a quick google:

http://www.kernel.org/pub/linux/kernel/people/npiggin/patches/lock-bitops/2.6.22-rc4/mm-unlock-speedup.patch
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