Re: [PATCH v9 net-next 2/7] net: add low latency socket poll

From: Eric Dumazet
Date: Wed Jun 05 2013 - 11:39:32 EST

On Wed, 2013-06-05 at 18:30 +0300, Eliezer Tamir wrote:
> On 05/06/2013 18:21, Eric Dumazet wrote:
> > On Wed, 2013-06-05 at 13:34 +0300, Eliezer Tamir wrote:
> >
> >
> > This is probably too big to be inlined, and nonblock should be a bool
> > It would also make sense to give end_time as a parameter, so that the
> > polling() code could really give a end_time for the whole duration of
> > poll().
> >
> > (You then should test can_poll_ll(end_time) _before_ call to
> > ndo_ll_poll())
> how would you handle a nonblocking operation in that case?
> I guess if we have a socket option, then we don't need to handle none
> blocking any diffrent, since the user specified exactly how much time to
> waste polling. right?

If the thread already spent 50us in the poll() system call, it for sure
should not call any ndo_ll_poll(). This makes no more sense at this

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