Commit 18421249 authored by Hui Tang's avatar Hui Tang
Browse files

sched: Support to enable/disable dynamic_affinity 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IAUFO7



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

Currently, the 'dynamic_affinty' can be enabled but can not
disabled by cmdline.

In some scenarios may need to be enabled by default, it is
more reasonable changing cmdline to 'dynamic_affinty=enable/disable'.

Signed-off-by: default avatarHui Tang <tanghui20@huawei.com>
parent 91ff8f4b

kernel/sched/fair.c

+19 −4
Original line number Diff line number Diff line
@@ -8962,12 +8962,27 @@ static int find_energy_efficient_cpu(struct task_struct *p, int prev_cpu) 


DEFINE_STATIC_KEY_FALSE(__dynamic_affinity_switch);



static int __init dynamic_affinity_switch_setup(char *__unused)

static int __init dynamic_affinity_switch_setup(char *str)

{

	int ret = 1;



	if (!str)

		goto out;



	if (!strcmp(str, "enable"))

		static_branch_enable(&__dynamic_affinity_switch);

	return 1;

	else if (!strcmp(str, "disable"))

		static_branch_disable(&__dynamic_affinity_switch);

	else

		ret = 0;



out:

	if (!ret)

		pr_warn("Unable to parse dynamic_affinity=\n");



	return ret;

}

__setup("dynamic_affinity", dynamic_affinity_switch_setup);

__setup("dynamic_affinity=", dynamic_affinity_switch_setup);



static inline bool prefer_cpus_valid(struct task_struct *p)

{