Re: condvar performance in .59 vs .60

[Jamie Lokier <jamie shareable org>]

dada1 wrote:
> v.59 used to use a special futex op, FUTEX_REQUEUE, but it seems a potential
> bug exists with this call.

There is a known bug in 2.6.0-test6 with FUTEX_REQUEUE, but I wonder
if it's the same bug you're thinking of that causes v.60 to not use
this operation.

Do you know what the "potential bug" it is?

If there's a conceptual problem and NPTL is not going to use
FUTEX_REQUEUE any more because of a condvar deadlock, then it may as
well be removed from the kernel.

Thanks,
-- Jamie