Offering: HULK hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IAUFO7 CVE: NA

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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: Hui Tang tanghui20@huawei.com --- kernel/sched/fair.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 415f4b060123..099a2e25d03d 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -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) { - static_branch_enable(&__dynamic_affinity_switch); - return 1; + int ret = 1; + + if (!str) + goto out; + + if (!strcmp(str, "enable")) + static_branch_enable(&__dynamic_affinity_switch); + 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) {