kern/thread: slightly improve tick counting

Move the increment outside of the run queue critical section.

1 files changed, 1 insertions, 2 deletions

diff --git a/kern/thread.c b/kern/thread.c
index 6b9d949c..60f57904 100644
--- a/kern/thread.c
+++ b/kern/thread.c
@@ -2002,13 +2002,12 @@ thread_tick_intr(void)
     assert(!thread_preempt_enabled());
 
     runq = thread_runq_local();
+    evcnt_inc(&runq->ev_tick);
     llsync_commit_checkpoint(thread_runq_id(runq));
     thread = thread_self();
 
     spinlock_lock(&runq->lock);
 
-    evcnt_inc(&runq->ev_tick);
-
     if (runq->nr_threads == 0)
         thread_balance_idle_tick(runq);