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[5/7,v3] sched: propagate asynchrous detach

Message ID 1473666472-13749-6-git-send-email-vincent.guittot@linaro.org
State Superseded
Headers show

Commit Message

Vincent Guittot Sept. 12, 2016, 7:47 a.m. UTC 
A task can be asynchronously detached from cfs_rq when migrating
between CPUs. The load of the migrated task is then removed from
source cfs_rq during its next update. We use this event to set propagation
flag.

During the load balance, we take advanatge of the update of blocked load
to we propagate any pending changes.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>

---
 kernel/sched/fair.c | 6 ++++++
 1 file changed, 6 insertions(+)

-- 
1.9.1
diff mbox

Patch

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e4015f6..25533ba 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3188,6 +3188,7 @@  update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq, bool update_freq)
 		sub_positive(&sa->load_avg, r);
 		sub_positive(&sa->load_sum, r * LOAD_AVG_MAX);
 		removed_load = 1;
+		set_tg_cfs_propagate(cfs_rq);
 	}
 
 	if (atomic_long_read(&cfs_rq->removed_util_avg)) {
@@ -3195,6 +3196,7 @@  update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq, bool update_freq)
 		sub_positive(&sa->util_avg, r);
 		sub_positive(&sa->util_sum, r * LOAD_AVG_MAX);
 		removed_util = 1;
+		set_tg_cfs_propagate(cfs_rq);
 	}
 
 	decayed = __update_load_avg(now, cpu_of(rq_of(cfs_rq)), sa,
@@ -6567,6 +6569,10 @@  static void update_blocked_averages(int cpu)
 
 		if (update_cfs_rq_load_avg(cfs_rq_clock_task(cfs_rq), cfs_rq, true))
 			update_tg_load_avg(cfs_rq, 0);
+
+		/* Propagate pending load changes to the parent */
+		if (cfs_rq->tg->se[cpu])
+			update_load_avg(cfs_rq->tg->se[cpu], 0, 0);
 	}
 	raw_spin_unlock_irqrestore(&rq->lock, flags);
 }