diff options
| author | Kapileshwar Singh <kapileshwar.singh@arm.com> | 2015-06-15 16:43:34 +0100 |
|---|---|---|
| committer | Vincent Guittot <vincent.guittot@linaro.org> | 2015-08-10 17:56:52 +0200 |
| commit | 1a14516eb1fea400bc6ffb256c9bbdd19a3172e2 (patch) | |
| tree | dd9870c3f70c71458e4e94c4224c646ebc755fca | |
| parent | f8e5e8dfb60afde4871f20385819543fbce45255 (diff) | |
WIP: sched: WakeMigration: NOHZ kick from a Lower Capacity CPU
If a lower capacity CPU is overutilized due to a single task
running on it. It makes sense to wake up other CPUs for finding a
better/higher capacity CPU which can service the task.
Change-Id: Ifc745c30df034b765ae6a38cf5b16ac9e0093f14
Signed-off-by: Kapileshwar Singh <kapileshwar.singh@arm.com>
| -rw-r--r-- | kernel/sched/fair.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index dcf8f36d2e5e..7569201a1f07 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -8584,6 +8584,17 @@ static inline bool nohz_kick_needed(struct rq *rq) if (time_before(now, nohz.next_balance)) return false; + /* If the CPU is saturated (overutilized by a + * single task and is not the highest capacity + * CPU in the system. It is worth initiating a + * a nohz kick, so that rebalance domains can + * place this task on a higher capacity CPU + */ + if (energy_aware() + && cpu_saturated(cpu) + && capacity_orig_of(cpu) != SCHED_CAPACITY_SCALE) + return true; + if (rq->nr_running >= 2 && (!energy_aware() || cpu_overutilized(cpu))) return true; |