MINOR: kqueue: move kqueue_fd to read_mostly
This one only contains the list of per-thread kqueue FDs, and is used
a lot during updates. Let's mark it read_mostly to avoid false sharing
of FDs placed at the extremities.
diff --git a/src/ev_kqueue.c b/src/ev_kqueue.c
index ee6b8c2..e9ca1ba 100644
--- a/src/ev_kqueue.c
+++ b/src/ev_kqueue.c
@@ -27,7 +27,7 @@
/* private data */
-static int kqueue_fd[MAX_THREADS]; // per-thread kqueue_fd
+static int kqueue_fd[MAX_THREADS] __read_mostly; // per-thread kqueue_fd
static THREAD_LOCAL struct kevent *kev = NULL;
static struct kevent *kev_out = NULL; // Trash buffer for kevent() to write the eventlist in