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Date: Fri, 29 Jun 2018 15:29:24 +0200 From: Christoph Hellwig <hch@....de> To: Al Viro <viro@...IV.linux.org.uk> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Christoph Hellwig <hch@....de>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, Network Development <netdev@...r.kernel.org>, LKP <lkp@...org> Subject: Re: [PATCH 6/6] fs: replace f_ops->get_poll_head with a static ->f_poll_head pointer 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.
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