On Thu, Jun 28, 2018 at 10:30:27PM +0100, Al Viro wrote: > > Because I think that what it can do is simply to do the ->poll() calls > > outside the iocb locks, and then just attach the poll table to the > > kioctx afterwards. > > I'd do a bit more - embed the first poll_table_entry into poll iocb itself, > so that the instances that use only one queue wouldn't need any allocations > at all. No need for poll_table_entry, we just need a wait_queue_head. poll_table_entry is an select.c internal (except for two nasty driver) - neither epoll nor most in-kernel callers use it.
