psi_task_change

Name:psi_task_change

Proto:void psi_task_change(struct task_struct *task, int clear, int set)

Type:void

Parameter:

Type	Parameter	Name
struct task_struct *	task
int	clear
int	set

749

cpu = task_cpu(task)

751

bool wake_clock = true

752

void * iter = NULL

754

If Not process id Then Return

757

If ( psi_flags & set || (psi_flags & clear) != clear ) && Not psi_bug Then

760

Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !

763

psi_bug = 1

766

psi_flags &= ~clear

767

psi_flags |= set

775

If Value for the false possibility is greater at compile time((clear & TSK_RUNNING) && ( Per task flags (PF_*), defined further below: & I'm a workqueue worker ) && wq_worker_last_func - retrieve worker's last work function*@task: Task to retrieve last work function of == psi_avgs_work) Then wake_clock = false

780

When group = iterate_groups(task, & iter) cycle

781

state_mask = psi_group_change(group, cpu, clear, set)

783

If state_mask & poll_states Then Schedule polling if it's not already scheduled. It's safe to call even from* hotpath because even though kthread_queue_delayed_work takes worker->lock* spinlock that spinlock is never contended due to poll_scheduled atomic* preventing such competition.

786

If wake_clock && Not delayed_work_pending - Find out whether a delayable work item is currently* pending*@w: The work item in question( & avgs_work) Then schedule_delayed_work - put work task in global workqueue after delay*@dwork: job to be done*@delay: number of jiffies to wait or 0 for immediate execution* After waiting for a given time this puts a job in the kernel-global* workqueue.

**Caller**
Name	Describe
psi_memstall_enter	psi_memstall_enter - mark the beginning of a memory stall section@flags: flags to handle nested sections Marks the calling task as being stalled due to a lack of memory,* such as waiting for a refault or performing reclaim.
psi_memstall_leave	psi_memstall_leave - mark the end of an memory stall section@flags: flags to handle nested memdelay sections Marks the calling task as no longer stalled due to lack of memory.
cgroup_move_task	group_move_task - move task to a different cgroup@task: the task@to: the target css_set* Move task to a new cgroup and safely migrate its associated stall* state between the different groups

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