Rusty Russell a écrit :
On Tue, 2006-10-31 at 15:09 -0800, [email protected] wrote:
From: Andrew Morton <[email protected]>
Apparently FUTEX_FD is unfixably racy and nothing uses it (or if it does, it
shouldn't).
Add a warning printk, give any remaining users six months to migrate off it.
This makes sense. FUTEX_FD was for the NGPT project which did userspace
threading, and hence couldn't block. It was always kind of a hack
(although unfixably racy isn't quite right, it depends on usage).
However, the existence of FUTEX_FD is what made Ingo complain that we
couldn't simply pin the futex page in memory, because now a process
could pin one page per fd. Removing it would seem to indicate that we
can return to a much simpler scheme of (1) pinning a page when someone
does futex_wait, and (2) simply comparing futexes by physical address.
Now, I realize with some dismay that simplicity is no longer a futex
feature, but it might be worth considering?
Hum... I am not sure playing MM games is good... really...
This discussion reminds me I posted a patch some time ago that got no comments
from the community.
http://lkml.org/lkml/2006/8/9/26
Eric
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