[PATCH v2 3/3] nohz_full: update cpu load fix in nohz_full

[Alex Shi]

We are not always 0 when update nohz cpu load, after nohz_full enabled.
But current code still treat the cpu as idle. that is incorrect.
Fix it to use correct cpu_load.

Signed-off-by: Alex Shi <alex.shi@xxxxxxxxxx>
---
 kernel/sched/proc.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/proc.c b/kernel/sched/proc.c
index 16f5a30..f1441f0 100644
--- a/kernel/sched/proc.c
+++ b/kernel/sched/proc.c
@@ -568,8 +568,14 @@ void update_cpu_load_nohz(void)
 		/*
 		 * We were idle, this means load 0, the current load might be
 		 * !0 due to remote wakeups and the sort.
+		 * or we may has only one task and in NO_HZ_FULL, then still use
+		 * normal cpu load.
 		 */
-		__update_cpu_load(this_rq, 0, pending_updates);
+		if (this_rq->cfs.h_nr_running) {
+			unsigned load = get_rq_runnable_load(this_rq);
+			__update_cpu_load(this_rq, load, pending_updates);
+		} else
+			__update_cpu_load(this_rq, 0, pending_updates);
 	}
 	raw_spin_unlock(&this_rq->lock);
 }
-- 
1.8.1.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/