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authorDietmar Eggemann <dietmar.eggemann@arm.com>2018-08-03 15:05:38 +0100
committerIngo Molnar <mingo@kernel.org>2018-10-02 09:45:03 +0200
commit4a465e3ebbc8004ce4f7f08f6022ee8315a94edf (patch)
tree74b34e40dd3b727fbf9f02de7e3288227e764074 /kernel/sched/pelt.c
parentfdf5f315d5cfaefb7bb8a62ec4bf37b9891837aa (diff)
sched/fair: Remove setting task's se->runnable_weight during PELT update
A CFS (SCHED_OTHER, SCHED_BATCH or SCHED_IDLE policy) task's se->runnable_weight must always be in sync with its se->load.weight. se->runnable_weight is set to se->load.weight when the task is forked (init_entity_runnable_average()) or reniced (reweight_entity()). There are two cases in set_load_weight() which since they currently only set se->load.weight could lead to a situation in which se->load.weight is different to se->runnable_weight for a CFS task: (1) A task switches to SCHED_IDLE. (2) A SCHED_FIFO, SCHED_RR or SCHED_DEADLINE task which has been reniced (during which only its static priority gets set) switches to SCHED_OTHER or SCHED_BATCH. Set se->runnable_weight to se->load.weight in these two cases to prevent this. This eliminates the need to explicitly set it to se->load.weight during PELT updates in the CFS scheduler fastpath. Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Joel Fernandes <joelaf@google.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Morten Rasmussen <morten.rasmussen@arm.com> Cc: Patrick Bellasi <patrick.bellasi@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Quentin Perret <quentin.perret@arm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vincent Guittot <vincent.guittot@linaro.org> Link: http://lkml.kernel.org/r/20180803140538.1178-1-dietmar.eggemann@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/pelt.c')
-rw-r--r--kernel/sched/pelt.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/kernel/sched/pelt.c b/kernel/sched/pelt.c
index 48a126486435..90fb5bc12ad4 100644
--- a/kernel/sched/pelt.c
+++ b/kernel/sched/pelt.c
@@ -269,9 +269,6 @@ ___update_load_avg(struct sched_avg *sa, unsigned long load, unsigned long runna
int __update_load_avg_blocked_se(u64 now, int cpu, struct sched_entity *se)
{
- if (entity_is_task(se))
- se->runnable_weight = se->load.weight;
-
if (___update_load_sum(now, cpu, &se->avg, 0, 0, 0)) {
___update_load_avg(&se->avg, se_weight(se), se_runnable(se));
return 1;
@@ -282,9 +279,6 @@ int __update_load_avg_blocked_se(u64 now, int cpu, struct sched_entity *se)
int __update_load_avg_se(u64 now, int cpu, struct cfs_rq *cfs_rq, struct sched_entity *se)
{
- if (entity_is_task(se))
- se->runnable_weight = se->load.weight;
-
if (___update_load_sum(now, cpu, &se->avg, !!se->on_rq, !!se->on_rq,
cfs_rq->curr == se)) {