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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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