#include <linux/rwsem.h>
struct autogroup {
+ /*
+ * reference doesn't mean how many thread attach to this
+ * autogroup now. It just stands for the number of task
+ * could use this autogroup.
+ */
struct kref kref;
struct task_group *tg;
struct rw_semaphore lock;
static inline struct task_group *
autogroup_task_group(struct task_struct *p, struct task_group *tg)
{
- if (task_wants_autogroup(p, tg))
+ int enabled = ACCESS_ONCE(sysctl_sched_autogroup_enabled);
+
+ if (enabled && task_wants_autogroup(p, tg))
return p->signal->autogroup->tg;
return tg;