Commit 8b45f57c authored by Yu Jiahua's avatar Yu Jiahua Committed by Zheng Zengkai
Browse files

sched: Add switch for update_blocked_averages 

hulk inclusion
category: feature
bugzilla: 175551 https://gitee.com/openeuler/kernel/issues/I4DVI3



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

Avaliable for switch on/off for update_blocked_averages, it helps reducing
cpu usage when system in heavy load.

Signed-off-by: default avatarYu Jiahua <yujiahua1@huawei.com>
Reviewed-by: default avatarChen Hui <judy.chenhui@huawei.com>
Signed-off-by: default avatarChen Jun <chenjun102@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent 44483ea0

include/linux/sched/sysctl.h

+7 −0
Original line number Diff line number Diff line
@@ -98,4 +98,11 @@ int sched_energy_aware_handler(struct ctl_table *table, int write, 
		void *buffer, size_t *lenp, loff_t *ppos);

#endif



#ifdef CONFIG_SCHED_OPTIMIZE_LOAD_TRACKING

extern int sysctl_blocked_averages(struct ctl_table *table, int write,

		  void __user *buffer, size_t *lenp, loff_t *ppos);



extern struct static_key_true sched_blocked_averages;

#endif



#endif /* _LINUX_SCHED_SYSCTL_H */

kernel/sched/fair.c

+40 −0
Original line number Diff line number Diff line
@@ -8001,6 +8001,39 @@ static void attach_tasks(struct lb_env *env) 
	rq_unlock(env->dst_rq, &rf);

}



#ifdef CONFIG_SCHED_OPTIMIZE_LOAD_TRACKING

DEFINE_STATIC_KEY_TRUE(sched_blocked_averages);



static void set_blocked_averages(bool enabled)

{

	if (enabled)

		static_branch_enable(&sched_blocked_averages);

	else

		static_branch_disable(&sched_blocked_averages);

}



int sysctl_blocked_averages(struct ctl_table *table, int write,

			    void __user *buffer, size_t *lenp, loff_t *ppos)

{

	struct ctl_table t;

	int err;

	int state = static_branch_likely(&sched_blocked_averages);



	if (write && !capable(CAP_SYS_ADMIN))

		return -EPERM;



	t = *table;

	t.data = &state;

	err = proc_dointvec_minmax(&t, write, buffer, lenp, ppos);

	if (err < 0)

		return err;

	if (write)

		set_blocked_averages(state);



	return err;

}

#endif



#ifdef CONFIG_NO_HZ_COMMON

static inline bool cfs_rq_has_blocked(struct cfs_rq *cfs_rq)

{
@@ -8204,6 +8237,13 @@ static void update_blocked_averages(int cpu) 
	rq_lock_irqsave(rq, &rf);

	update_rq_clock(rq);



#ifdef CONFIG_SCHED_OPTIMIZE_LOAD_TRACKING

	if (!static_branch_unlikely(&sched_blocked_averages)) {

		rq_unlock_irqrestore(rq, &rf);

		return;

	}

#endif



	decayed |= __update_blocked_others(rq, &done);

	decayed |= __update_blocked_fair(rq, &done);

kernel/sysctl.c

+11 −0
Original line number Diff line number Diff line
@@ -1764,6 +1764,17 @@ static struct ctl_table kern_table[] = { 
	},

#endif /* CONFIG_NUMA_BALANCING */

#endif /* CONFIG_SCHED_DEBUG */

#ifdef CONFIG_SCHED_OPTIMIZE_LOAD_TRACKING

	{

		.procname	= "sched_blocked_averages",

		.data		= NULL,

		.maxlen		= sizeof(unsigned int),

		.mode		= 0644,

		.proc_handler	= sysctl_blocked_averages,

		.extra1		= SYSCTL_ZERO,

		.extra2		= SYSCTL_ONE,

	},

#endif

	{

		.procname	= "sched_rt_period_us",

		.data		= &sysctl_sched_rt_period,