On Wed, 25 Sep 2019 09:56:03 +0800 hev <r@xxxxxx> wrote: > From: Heiher <r@xxxxxx> > > Take the case where we have: > > t0 > | (ew) > e0 > | (et) > e1 > | (lt) > s0 > > t0: thread 0 > e0: epoll fd 0 > e1: epoll fd 1 > s0: socket fd 0 > ew: epoll_wait > et: edge-trigger > lt: level-trigger > > We only need to wakeup nested epoll fds if something has been queued to the > overflow list, since the ep_poll() traverses the rdllist during recursive poll > and thus events on the overflow list may not be visible yet. > > Test code: Look sane to me. Do you have any performance testing results which show a benefit? epoll maintainership isn't exactly a hive of activity nowadays :( Roman, would you please have time to review this?
