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anolis: sched: introduce sysctl_sched_acpu_enabled 

ANBZ: #6729

In order to be able to dynamically turn on and off acpu accounting, we
introduce sysctl_sched_acpu_enabled, instead of default on.

Signed-off-by: Cruz Zhao <CruzZhao@linux.alibaba.com>
Reviewed-by: Guixin Liu <kanie@linux.alibaba.com>
Link: https://gitee.com/anolis/cloud-kernel/pulls/2260
This commit is contained in:
Cruz Zhao 2023-09-19 17:22:19 +08:00 committed by 小龙
parent b8c642c811
commit 78300c148f
5 changed files with 48 additions and 8 deletions
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6
include/linux/sched.h
View File

@ -2351,10 +2351,4 @@ static inline void sched_core_fork(struct task_struct *p) { }
static inline int sched_core_idle_cpu(int cpu) { return idle_cpu(cpu); }
#endif
#ifdef CONFIG_SCHED_ACPU
extern void acpu_enable(void);
#else
static inline void acpu_enable(void) { }
#endif
#endif

6
include/linux/sched/sysctl.h
View File

@ -120,4 +120,10 @@ int sched_energy_aware_handler(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
#endif
#ifdef CONFIG_SCHED_ACPU
extern unsigned int sysctl_sched_acpu_enabled;
extern int sched_acpu_enable_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos);
#endif
#endif /* _LINUX_SCHED_SYSCTL_H */

32
kernel/sched/core.c
View File

@ -79,6 +79,7 @@ unsigned int sysctl_sched_cfs_bw_burst_enabled = 1;
#ifdef CONFIG_SCHED_ACPU
DEFINE_STATIC_KEY_FALSE(acpu_enabled);
unsigned int sysctl_sched_acpu_enabled;
#endif
/*
@ -3918,7 +3919,7 @@ fire_sched_out_preempt_notifiers(struct task_struct *curr,
#endif /* CONFIG_PREEMPT_NOTIFIERS */
#ifdef CONFIG_SCHED_ACPU
void acpu_enable(void)
static void acpu_enable(void)
{
int i;
@ -3931,6 +3932,35 @@ void acpu_enable(void)
static_branch_enable(&acpu_enabled);
}
static void acpu_disable(void)
{
static_branch_disable(&acpu_enabled);
}
int sched_acpu_enable_handler(struct ctl_table *table, int write, void __user *buffer,
size_t *lenp, loff_t *ppos)
{
int ret;
unsigned int old, new;
if (!write) {
ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
return ret;
}
old = sysctl_sched_acpu_enabled;
ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
new = sysctl_sched_acpu_enabled;
if (!ret && write && (old != new)) {
if (new)
acpu_enable();
else
acpu_disable();
}
return ret;
}
static void update_acpu(struct rq *rq, struct task_struct *prev, struct task_struct *next)
{
const int cpu = cpu_of(rq);

1
kernel/smpboot.c
View File

@ -73,7 +73,6 @@ void __init idle_threads_init(void)
if (cpu != boot_cpu)
idle_init(cpu);
}
acpu_enable();
}
#endif

11
kernel/sysctl.c
View File

@ -2047,6 +2047,17 @@ static struct ctl_table kern_table[] = {
.extra2 = SYSCTL_ONE,
},
#endif
#ifdef CONFIG_SCHED_ACPU
{
.procname = "sched_acpu",
.data = &sysctl_sched_acpu_enabled,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = sched_acpu_enable_handler,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
#endif /* CONFIG_SCHED_ACPU*/
#ifdef CONFIG_PROVE_LOCKING
{
.procname = "prove_locking",