Re: Switching TestSetPageLocked to trylock_page

[Nick Piggin]

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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