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sched: sync child based on tg->offline after fork 

Signed-off-by: Xiaoguang Chen <xiaoggchen@tencent.com>
Signed-off-by: Zhiguang Peng <zgpeng@tencent.com>
Signed-off-by: He Chen <heddchen@tencent.com>
This commit is contained in:
He Chen 2020-09-14 14:24:34 +08:00
parent fe12e6a602
commit 46dedbcaa0
2 changed files with 20 additions and 4 deletions
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21
kernel/sched/core.c
View File

@ -2481,9 +2481,17 @@ int sched_fork(unsigned long clone_flags, struct task_struct *p)
p->sched_class = &rt_sched_class;
#ifdef CONFIG_BT_SCHED
} else if(bt_prio(p->prio)){
p->normal_prio = p->static_prio = p->prio;
p->policy = SCHED_BT;
p->sched_class = &bt_sched_class;
set_bt_load_weight(p);
#endif
} else {
#ifdef CONFIG_BT_SCHED
p->normal_prio = p->static_prio = p->prio;
p->policy = SCHED_NORMAL;
set_load_weight(p);
#endif
p->sched_class = &fair_sched_class;
}
@ -6466,6 +6474,8 @@ struct task_group *sched_create_group(struct task_group *parent)
if (!alloc_rt_sched_group(tg, parent))
goto err;
mutex_init(&tg->offline_mutex);
return tg;
err:
@ -6539,8 +6549,7 @@ static void sched_change_group(struct task_struct *tsk, int type)
#ifdef CONFIG_BT_GROUP_SCHED
/* No need to re-setcheduler when fork or exit a task */
if (offlinegroup_enabled && !rt_task(tsk) &&
!(tsk->flags & PF_EXITING) && (type != TASK_SET_GROUP)) {
if (offlinegroup_enabled && !rt_task(tsk) && !(tsk->flags & PF_EXITING) ) {
struct rq *rq = task_rq(tsk);
struct sched_attr attr = {
.sched_priority = 0,
@ -7055,15 +7064,16 @@ static int cpu_offline_write_uint(struct cgroup_subsys_state *css,
if (!tg->se[0])
return -EINVAL;
mutex_lock(&tg->offline_mutex);
if (tg->offline == !!offline_input)
return 0;
goto done;
if (!tg->offline && offline_input) {
sched_class = SCHED_BT;
} else if (tg->offline && !offline_input) {
sched_class = SCHED_NORMAL;
} else
return 0;
goto done;
tg->offline = !!offline_input;
@ -7077,6 +7087,9 @@ static int cpu_offline_write_uint(struct cgroup_subsys_state *css,
}
}
css_task_iter_end(&it);
done:
mutex_unlock(&tg->offline_mutex);
return 0;
}

3
kernel/sched/sched.h
View File

@ -375,7 +375,10 @@ struct task_group {
u64 cpuquota_aware;
struct cfs_bandwidth cfs_bandwidth;
#ifdef CONFIG_BT_GROUP_SCHED
unsigned long offline;
struct mutex offline_mutex;
#endif
};
#ifdef CONFIG_FAIR_GROUP_SCHED