linux-kernel - Re: [rfc] optimise unlock

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Message-ID: <Pine.LNX.4.64.0705082054500.18925@blonde.wat.veritas.com>
Date:	Tue, 8 May 2007 21:08:09 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Nick Piggin <npiggin@...e.de>
cc:	linux-arch@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [rfc] optimise unlock_page

On Tue, 8 May 2007, Nick Piggin wrote:

> This patch trades a page flag for a significant improvement in the unlock_page
> fastpath. Various problems in the previous version were spotted by Hugh and
> Ben (and fixed in this one).
> 
> Comments?

Seems there's still a bug there.  I get hangs on the page lock, on
i386 and on x86_64 and on powerpc: sometimes they unhang themselves
after a while (presume other activity does the wakeup).  Obvious even
while booting (Starting udevd).  Sorry, not had time to investigate.

Hugh
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