linux-kernel - Switching TestSetPageLocked to trylock

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Date:	Thu, 31 Jul 2008 17:26:51 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Switching TestSetPageLocked to trylock_page

Hi,

I'm wondering if I could get a patch merged which changes all
TestSetPageLocked and replaces them with trylock_page?

It would be done so there are no functional changes.

The reason I want to (aside from having a slightly more
intuitive API), is to facilitate the implementation of lockdep
on page lock, and also to use lock semantics bitops for the
lock rather than the big-hammer barriers that come with
test_and_set_bit.

The lock bitops stuff is one of the parts of my patchset to speed
up page lock functions (which results in nearly 50% faster
pagecache throughput on my G5, and even slightly faster on x86)...

Anyway, I remember you said these kinds of changes are appropriate
for just after -rc1, and I agree it shouldn't cause much pain.

Fixing up patch conflicts is literally a matter of
s/!TestSetPageLocked/trylock_page
s/TestSetPageLocked/!trylock_page

Thoughts?
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