Messages in this thread Patch in this message | | | From | Parth Shah <> | Subject | [RFC v6 2/5] sched/core: Update turbo_sched count only when required | Date | Tue, 21 Jan 2020 12:03:04 +0530 |
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Use the get/put methods to add/remove the use of TurboSched support, such that the feature is turned on only in the presence of atleast one classified small bckground task.
Signed-off-by: Parth Shah <parth@linux.ibm.com> --- kernel/sched/core.c | 9 +++++++++ kernel/sched/sched.h | 3 +++ 2 files changed, 12 insertions(+)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index dfbb52d66b29..629c2589d727 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3272,6 +3272,9 @@ static struct rq *finish_task_switch(struct task_struct *prev) mmdrop(mm); } if (unlikely(prev_state == TASK_DEAD)) { + if (unlikely(is_bg_task(prev))) + turbo_sched_put(); + if (prev->sched_class->task_dead) prev->sched_class->task_dead(prev); @@ -4800,6 +4803,8 @@ static int __sched_setscheduler(struct task_struct *p, int reset_on_fork; int queue_flags = DEQUEUE_SAVE | DEQUEUE_MOVE | DEQUEUE_NOCLOCK; struct rq *rq; + bool attr_leniency = bgtask_latency(attr->sched_latency_nice); + /* The pi code expects interrupts enabled */ BUG_ON(pi && in_interrupt()); @@ -5024,6 +5029,10 @@ static int __sched_setscheduler(struct task_struct *p, prev_class = p->sched_class; + /* Refcount tasks classified as a small background task */ + if (is_bg_task(p) != attr_leniency) + attr_leniency ? turbo_sched_get() : turbo_sched_put(); + __setscheduler(rq, p, attr, pi); __setscheduler_uclamp(p, attr); diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index f841297b7d56..0a00e16e033a 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -2498,6 +2498,9 @@ static inline void membarrier_switch_mm(struct rq *rq, } #endif +#define bgtask_latency(lat) ((lat) == MAX_LATENCY_NICE) +#define is_bg_task(p) (bgtask_latency((p)->latency_nice)) + void turbo_sched_get(void); void turbo_sched_put(void); -- 2.17.2
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