linux-kernel - Re: Switching TestSetPageLocked to trylock

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Message-ID: <alpine.LFD.1.10.0808042106250.3299@nehalem.linux-foundation.org>
Date:	Mon, 4 Aug 2008 21:25:29 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Switching TestSetPageLocked to trylock_page



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?

		Linus
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