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SubjectRe: [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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