kernel/cgroup/cpuset.c

121 	nodemask_t mems_allowed;
149 	 * - top_cpuset.old_mems_allowed is initialized to mems_allowed.
153 	 *   cpuset.mems_allowed and have tasks' nodemask updated, and
154 	 *   then old_mems_allowed is updated to mems_allowed.
162 	 * zeroing cpus/mems_allowed between ->can_attach() and ->attach().
424  * Now, the task_struct fields mems_allowed and mempolicy may be changed
563  * Return in *pmask the portion of a cpusets's mems_allowed that
614 		nodes_subset(p->mems_allowed, q->mems_allowed) &&
786  * perhaps one or more of the fields cpus_allowed, mems_allowed,
813 	 * be changed to have empty cpus_allowed or mems_allowed.
820 		if (!nodes_empty(cur->mems_allowed) &&
821 		    nodes_empty(trial->mems_allowed))
848 		    nodes_intersects(trial->mems_allowed, c->mems_allowed))
2693 	/* on a wq worker, no need to worry about %current's mems_allowed */
2727  * cpuset_change_task_nodemask - change task's mems_allowed and mempolicy
2731  * We use the mems_allowed_seq seqlock to safely update both tsk->mems_allowed
2744 	nodes_or(tsk->mems_allowed, tsk->mems_allowed, *newmems);
2746 	tsk->mems_allowed = *newmems;
2758  * @cs: the cpuset in which each task's mems_allowed mask needs to be changed
2760  * Iterate through each task of @cs updating its mems_allowed to the
2797 		mpol_rebind_mm(mm, &cs->mems_allowed);
2811 	/* We're done rebinding vmas to this cpuset's new mems_allowed. */
2823  * On legacy hierarchy, effective_mems will be the same with mems_allowed.
2836 		nodes_and(*new_mems, cp->mems_allowed, parent->effective_mems);
2860 			!nodes_equal(cp->mems_allowed, cp->effective_mems));
2873  * cpusets mems_allowed, and for each task in the cpuset,
2874  * update mems_allowed and rebind task's mempolicy and any vma
2881  * their mempolicies to the cpusets new mems_allowed.
2889 	 * top_cpuset.mems_allowed tracks node_stats[N_MEMORY];
2898 	 * An empty mems_allowed is ok iff there are no tasks in the cpuset.
2904 		nodes_clear(trialcs->mems_allowed);
2906 		retval = nodelist_parse(buf, trialcs->mems_allowed);
2910 		if (!nodes_subset(trialcs->mems_allowed,
2911 				  top_cpuset.mems_allowed)) {
2917 	if (nodes_equal(cs->mems_allowed, trialcs->mems_allowed)) {
2925 	check_insane_mems_config(&trialcs->mems_allowed);
2928 	cs->mems_allowed = trialcs->mems_allowed;
2931 	/* use trialcs->mems_allowed as a temp variable */
2932 	update_nodemasks_hier(cs, &trialcs->mems_allowed);
3252  * For v1, cpus_allowed and mems_allowed can't be empty.
3259 	   (!is_in_v2_mode() && nodes_empty(cs->mems_allowed)))
3339 	 * changes which zero cpus/mems_allowed.
3449 			 * old_mems_allowed is the same with mems_allowed
3452 			 * @mems_allowed has been updated and is empty, so
3671 		seq_printf(sf, "%*pbl\n", nodemask_pr_args(&cs->mems_allowed));
4023 	nodes_clear(cs->mems_allowed);
4105 	cs->mems_allowed = parent->mems_allowed;
4106 	cs->effective_mems = parent->mems_allowed;
4170 		top_cpuset.mems_allowed = node_possible_map;
4174 		top_cpuset.mems_allowed = top_cpuset.effective_mems;
4216 	 * changes which zero cpus/mems_allowed.
4263 		task->mems_allowed = current->mems_allowed;
4314 	nodes_setall(top_cpuset.mems_allowed);
4347 			nodes_empty(parent->mems_allowed))
4367 	cs->mems_allowed = *new_mems;
4377 	if (mems_updated && !nodes_empty(cs->mems_allowed))
4381 		   nodes_empty(cs->mems_allowed);
4482 	nodes_and(new_mems, cs->mems_allowed, parent->effective_mems);
4635 	/* synchronize mems_allowed to N_MEMORY */
4639 			top_cpuset.mems_allowed = new_mems;
4691  * Keep top_cpuset.mems_allowed tracking node_states[N_MEMORY].
4710 	 * cpus_allowd/mems_allowed set to v2 values in the initial
4714 	top_cpuset.old_mems_allowed = top_cpuset.mems_allowed;
4818 	nodes_setall(current->mems_allowed);
4822  * cpuset_mems_allowed - return mems_allowed mask from a tasks cpuset.
4823  * @tsk: pointer to task_struct from which to obtain cpuset->mems_allowed.
4825  * Description: Returns the nodemask_t mems_allowed of the cpuset
4846  * cpuset_nodemask_valid_mems_allowed - check nodemask vs. current mems_allowed
4849  * Are any of the nodes in the nodemask allowed in current->mems_allowed?
4853 	return nodes_intersects(*nodemask, current->mems_allowed);
4875  * current's mems_allowed, yes.  If it's not a __GFP_HARDWALL request and this
4889  * current tasks mems_allowed came up empty on the first pass over
4917 	if (node_isset(node, current->mems_allowed))
4931 	/* Not hardwall and node outside mems_allowed: scan up cpusets */
4936 	allowed = node_isset(node, cs->mems_allowed);
4954  * node around the tasks mems_allowed nodes.
4960  * only set nodes in task->mems_allowed that are online.  So it
4971 	return *rotor = next_node_in(*rotor, current->mems_allowed);
4981 			node_random(&current->mems_allowed);
4993 			node_random(&current->mems_allowed);
5000  * cpuset_mems_allowed_intersects - Does @tsk1's mems_allowed intersect @tsk2's?
5004  * Description: Return true if @tsk1's mems_allowed intersects the
5005  * mems_allowed of @tsk2.  Used by the OOM killer to determine if
5013 	return nodes_intersects(tsk1->mems_allowed, tsk2->mems_allowed);
5017  * cpuset_print_current_mems_allowed - prints current's cpuset and mems_allowed
5020  * mems_allowed to the kernel log.
5031 	pr_cont(",mems_allowed=%*pbl",
5032 		nodemask_pr_args(&current->mems_allowed));
5110 /* Display task mems_allowed in /proc/<pid>/status file. */
5114 		   nodemask_pr_args(&task->mems_allowed));
5116 		   nodemask_pr_args(&task->mems_allowed));