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Date:	Tue, 5 Aug 2008 14:46:52 +1000
From:	Nick Piggin <>
To:	Linus Torvalds <>
Cc:	Andrew Morton <>,
	Linux Kernel Mailing List <>
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:
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