The following line should be added head of commit log on patches 1~4. :)
From: Alex Shi <alex.shi@xxxxxxxxx>
> Cmpxchg will cause the cacheline bouning when do the value checking,
> that cause scalability issue in a large machine (like a 80 core box).
>
> So a lock pre-read can relief this contention.
>
> Signed-off-by: Alex Shi <alex.shi@xxxxxxxxx>
--
Thanks
Alex
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