Commit 0e927cb9 authored by He Yujie's avatar He Yujie
Browse files

sched: Optimize the latency of select_task_rq and pick_next_task. 

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBA1PI



--------------------------------

Reducing the select_task_rq run time by Checking the enable status of
dynamic affinity before attempting to hold rcu_lock and deleting the
enable check int dynamic_affinity_mode function.

Inline functions are used to reduce the execution time of pick_next_time
functions.

Fixes: 6eb07f99 ("sched: Introduce smart grid scheduling strategy for cfs")
Signed-off-by: default avatarHe Yujie <coka.heyujie@huawei.com>
parent fa76b7f1

kernel/sched/fair.c

+4 −7
Original line number Diff line number Diff line
@@ -6861,9 +6861,6 @@ static inline struct cpumask *task_prefer_cpus(struct task_struct *p) 


static inline int dynamic_affinity_mode(struct task_struct *p)

{

	if (!prefer_cpus_valid(p))

		return -1;



	if (smart_grid_used())

		return task_group(p)->auto_affinity->mode == 0 ? -1 : 1;
@@ -7324,9 +7321,6 @@ static inline struct cpumask *task_prefer_cpus(struct task_struct *p) 


static inline int dynamic_affinity_mode(struct task_struct *p)

{

	if (!prefer_cpus_valid(p))

		return -1;



	return 0;

}

#endif /* CONFIG_QOS_SCHED_DYNAMIC_AFFINITY */
@@ -9055,6 +9049,9 @@ static void set_task_select_cpus(struct task_struct *p, int *idlest_cpu, 
	int cpu, mode;



	p->select_cpus = p->cpus_ptr;

	if (!prefer_cpus_valid(p))

		return;



	rcu_read_lock();

	mode = dynamic_affinity_mode(p);

	if (mode == -1) {
@@ -9734,7 +9731,7 @@ static int __init qos_sched_smt_noexpell_setup(char *__unused) 
}

__setup("nosmtexpell", qos_sched_smt_noexpell_setup);



static bool qos_smt_check_siblings_status(int this_cpu)

static __always_inline bool qos_smt_check_siblings_status(int this_cpu)

{

	int cpu;