static DEFINE_MUTEX(cpuset_mutex);
static DEFINE_MUTEX(callback_mutex);
-/*
- * cpuset_buffer_lock protects both the cpuset_name and cpuset_nodelist
- * buffers. They are statically allocated to prevent using excess stack
- * when calling cpuset_print_task_mems_allowed().
- */
-#define CPUSET_NAME_LEN (128)
-#define CPUSET_NODELIST_LEN (256)
-static char cpuset_name[CPUSET_NAME_LEN];
-static char cpuset_nodelist[CPUSET_NODELIST_LEN];
-static DEFINE_SPINLOCK(cpuset_buffer_lock);
-
/*
* CPU / memory hotplug is handled asynchronously.
*/
return 0;
}
-/**
- * cpuset_do_move_task - move a given task to another cpuset
- * @tsk: pointer to task_struct the task to move
- * @scan: struct cgroup_scanner contained in its struct cpuset_hotplug_scanner
- *
- * Called by cgroup_scan_tasks() for each task in a cgroup.
- * Return nonzero to stop the walk through the tasks.
- */
-static void cpuset_do_move_task(struct task_struct *tsk,
- struct cgroup_scanner *scan)
-{
- struct cgroup *new_cgroup = scan->data;
-
- cgroup_lock();
- cgroup_attach_task(new_cgroup, tsk);
- cgroup_unlock();
-}
-
-/**
- * move_member_tasks_to_cpuset - move tasks from one cpuset to another
- * @from: cpuset in which the tasks currently reside
- * @to: cpuset to which the tasks will be moved
- *
- * Called with cpuset_mutex held
- * callback_mutex must not be held, as cpuset_attach() will take it.
- *
- * The cgroup_scan_tasks() function will scan all the tasks in a cgroup,
- * calling callback functions for each.
- */
-static void move_member_tasks_to_cpuset(struct cpuset *from, struct cpuset *to)
-{
- struct cgroup_scanner scan;
-
- scan.cg = from->css.cgroup;
- scan.test_task = NULL; /* select all tasks in cgroup */
- scan.process_task = cpuset_do_move_task;
- scan.heap = NULL;
- scan.data = to->css.cgroup;
-
- if (cgroup_scan_tasks(&scan))
- printk(KERN_ERR "move_member_tasks_to_cpuset: "
- "cgroup_scan_tasks failed\n");
-}
-
/*
* If CPU and/or memory hotplug handlers, below, unplug any CPUs
* or memory nodes, we need to walk over the cpuset hierarchy,
nodes_empty(parent->mems_allowed))
parent = parent_cs(parent);
- move_member_tasks_to_cpuset(cs, parent);
+ if (cgroup_transfer_tasks(parent->css.cgroup, cs->css.cgroup)) {
+ rcu_read_lock();
+ printk(KERN_ERR "cpuset: failed to transfer tasks out of empty cpuset %s\n",
+ cgroup_name(cs->css.cgroup));
+ rcu_read_unlock();
+ }
}
/**
return nodes_intersects(tsk1->mems_allowed, tsk2->mems_allowed);
}
+#define CPUSET_NODELIST_LEN (256)
+
/**
* cpuset_print_task_mems_allowed - prints task's cpuset and mems_allowed
* @task: pointer to task_struct of some task.
*/
void cpuset_print_task_mems_allowed(struct task_struct *tsk)
{
- struct dentry *dentry;
+ /* Statically allocated to prevent using excess stack. */
+ static char cpuset_nodelist[CPUSET_NODELIST_LEN];
+ static DEFINE_SPINLOCK(cpuset_buffer_lock);
- dentry = task_cs(tsk)->css.cgroup->dentry;
- spin_lock(&cpuset_buffer_lock);
+ struct cgroup *cgrp = task_cs(tsk)->css.cgroup;
- if (!dentry) {
- strcpy(cpuset_name, "/");
- } else {
- spin_lock(&dentry->d_lock);
- strlcpy(cpuset_name, (const char *)dentry->d_name.name,
- CPUSET_NAME_LEN);
- spin_unlock(&dentry->d_lock);
- }
+ rcu_read_lock();
+ spin_lock(&cpuset_buffer_lock);
nodelist_scnprintf(cpuset_nodelist, CPUSET_NODELIST_LEN,
tsk->mems_allowed);
printk(KERN_INFO "%s cpuset=%s mems_allowed=%s\n",
- tsk->comm, cpuset_name, cpuset_nodelist);
+ tsk->comm, cgroup_name(cgrp), cpuset_nodelist);
+
spin_unlock(&cpuset_buffer_lock);
+ rcu_read_unlock();
}
/*