On 18/06/2013 13:25, Eric Dumazet wrote:
> On Tue, 2013-06-18 at 11:58 +0300, Eliezer Tamir wrote:
>> @@ -731,7 +755,11 @@ static inline unsigned int do_pollfd(struct pollfd
>> *pollfd, poll_table *pwait)
>> mask = DEFAULT_POLLMASK;
>> if (f.file->f_op && f.file->f_op->poll) {
>> pwait->_key = pollfd->events|POLLERR|POLLHUP;
>> + if (try_ll)
>> + pwait->_key |= POLL_LL;
>
> Well, why enforce POLL_LL ?
>
> Sure we do this for select() as the API doesn't allow us to add the LL
> flag, but poll() can do that.
>
> An application might set POLL_LL flag only on selected fds.
One other thing,
sock_poll() will only ll_poll if the flag was set _and_ the socket has a
none-zero value in sk->sk_ll_usec so you still only poll on sockets
that were enabled for LLS, not on every socket.
-Eliezer
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