Commit 43980276 authored May 29, 2018 by Satya Durga Srinivasu Prabhala Committed by Gerrit - the friendly Code Review server May 31, 2018

sched/sched_avg: make number of running tasks conservative



Right now if a task ran 15% in the previous window, that task is
considered as part of number of running tasks as well as while
calculating misfit tasks on smaller capacity clusters which
agressively un-isolates higher capacity CPUs and may lead to
more power consumption. To avoid such issues, make number of
running tasks conservative by changing threshold to 85%.

Change-Id: Ic82724b822bb605fbda385ddeb50a591757d2c9d
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>

parent 746245c8

kernel/sched/sched_avg.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -35,7 +35,7 @@ static s64 last_get_time;

		static DEFINE_PER_CPU(atomic64_t, last_busy_time) = ATOMIC64_INIT(0);

		#define NR_THRESHOLD_PCT 85
		#define NR_THRESHOLD_PCT 15

		/**
		* sched_get_nr_running_avg
		@@ -76,7 +76,7 @@ void sched_get_nr_running_avg(struct sched_avg_stats *stats)

		/*
		* NR_THRESHOLD_PCT is to make sure that the task ran
		* at least 15% in the last window to compensate any
		* at least 85% in the last window to compensate any
		* over estimating being done.
		*/
		stats[cpu].nr = (int)div64_u64((tmp_nr + NR_THRESHOLD_PCT),