linux-kernel - Re: [PATCH 05/12] mm: trylock

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Message-Id: <200709281311.37616.nickpiggin@yahoo.com.au>
Date:	Fri, 28 Sep 2007 13:11:37 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	lkml <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
	Zach Brown <zach.brown@...cle.com>,
	Ingo Molnar <mingo@...e.hu>, akpm@...ux-foundation.org
Subject: Re: [PATCH 05/12] mm: trylock_page

On Friday 28 September 2007 17:42, Peter Zijlstra wrote:
> Replace raw TestSetPageLocked() usage with trylock_page()

I have such a thing queued too, for the lock bitops patches for when 2.6.24
opens, Andrew promises me :).

I guess they should be identical, except I don't like doing trylock_page in
place of SetPageLocked, for memory ordering performance and aesthetic
reasons... I've got an init_page_locked (or set_page_locked... I can't
remember, the patch is at home).

Fine idea to lockdep the page lock, anyway. Does it show up any of the
buffered write deadlock possibilities? :)

buffer lock is another notable bit-mutex that might be converted (I have
the patch to do the similar nice !tas->trylock conversion for that too). I
think it is used widely enough by tricky code that it would be useful to
annotate as well.

Unfortunately we can't convert bit_spinlock.h easily, I guess?
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