Hi Davide

I found in my tests that there is no need to have a f_ep_lock spinlock
attached to each struct file, using 8 bytes on 64bits platforms. The
lock is hold for a very short time period and can be global, with almost
no change in performance for applications using epoll, and a gain for
all others.

Thank you
Eric Dumazet

[PATCH] eventpoll : Suppress a short lived lock from struct file

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>