git+gcf2client: switch to level-triggered wakeups

Instead of using ->requeue to emulate level-triggered wakeups in
userspace, just use level-triggered wakeups in the kernel to
save some user time at the expense of system (kernel) time.  Of
course, the ready list implementation in the kernel via C is
faster than a Perl one on our end.

We must still use requeue if we've got buffered data, however.

Followup-to: 1181a7e6a853 (listener: switch to level-triggered epoll)

1 files changed, 4 insertions, 3 deletions

diff --git a/lib/PublicInbox/Git.pm b/lib/PublicInbox/Git.pm
index 3062f293..5003be53 100644
--- a/lib/PublicInbox/Git.pm
+++ b/lib/PublicInbox/Git.pm
@@ -650,15 +650,16 @@ sub event_step {
         if ($inflight && @$inflight) {
                 $self->cat_async_step($inflight);
                 return $self->close unless $self->{sock};
-                # more to do? requeue for fairness:
-                $self->requeue if @$inflight || exists($self->{rbuf});
+                # don't loop here to keep things fair, but we must requeue
+                # if there's already-read data in rbuf
+                $self->requeue if exists($self->{rbuf});
         }
 }
 
 # idempotently registers with DS epoll/kqueue/select/poll
 sub watch_async ($) {
         $_[0]->{epwatch} //= do {
-                $_[0]->SUPER::new($_[0]->{sock}, EPOLLIN|EPOLLET);
+                $_[0]->SUPER::new($_[0]->{sock}, EPOLLIN);
                 \undef;
         }
 }