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 <[email protected]> --- 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 [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
