kernel/cgroup/cpuset.c

870 	struct cpuset *cp;
874 	cpuset_for_each_descendant_pre(cp, pos_css, root_cs) {
875 		/* skip the whole subtree if @cp doesn't have any CPU */
876 		if (cpumask_empty(cp->cpus_allowed)) {
881 		if (is_sched_load_balance(cp))
882 			update_domain_attr(dattr, cp);
916  *    cp - cpuset pointer, used (together with pos_css) to perform a
950 	struct cpuset *cp;	/* top-down scan of cpusets */
983 	csa = kmalloc_array(nr_cpusets(), sizeof(cp), GFP_KERNEL);
991 	cpuset_for_each_descendant_pre(cp, pos_css, &top_cpuset) {
992 		if (cp == &top_cpuset)
995 		 * Continue traversing beyond @cp iff @cp has some CPUs and
1002 		 * If root is load-balancing, we can skip @cp if it
1005 		if (!cpumask_empty(cp->cpus_allowed) &&
1006 		    !(is_sched_load_balance(cp) &&
1007 		      cpumask_intersects(cp->cpus_allowed,
1012 		    cpumask_subset(cp->cpus_allowed, top_cpuset.effective_cpus))
1015 		if (is_sched_load_balance(cp) &&
1016 		    !cpumask_empty(cp->effective_cpus))
1017 			csa[csn++] = cp;
1019 		/* skip @cp's subtree if not a partition root */
1020 		if (!is_partition_valid(cp))
2116 	 *  2) All the effective_cpus will be used up and cp
2177 	struct cpuset *cp;
2183 	cpuset_for_each_descendant_pre(cp, pos_css, cs) {
2184 		struct cpuset *parent = parent_cs(cp);
2185 		bool remote = is_remote_partition(cp);
2192 		if (remote && (cp != cs)) {
2201 		if (!cpumask_empty(cp->exclusive_cpus) && (cp != cs)) {
2203 			compute_effective_exclusive_cpumask(cp, NULL);
2207 		old_prs = new_prs = cp->partition_root_state;
2209 			       is_partition_valid(cp)))
2210 			compute_partition_effective_cpumask(cp, tmp->new_cpus);
2212 			compute_effective_cpumask(tmp->new_cpus, cp, parent);
2219 		if (is_partition_valid(cp) && cpumask_empty(tmp->new_cpus)) {
2232 			if (!cp->use_parent_ecpus) {
2233 				cp->use_parent_ecpus = true;
2236 		} else if (cp->use_parent_ecpus) {
2237 			cp->use_parent_ecpus = false;
2252 		if (!cp->partition_root_state && !(flags & HIER_CHECKALL) &&
2253 		    cpumask_equal(tmp->new_cpus, cp->effective_cpus) &&
2255 		    (is_sched_load_balance(parent) == is_sched_load_balance(cp)))) {
2267 		if ((cp != cs) && old_prs) {
2280 				if (is_partition_valid(cp))
2281 					new_prs = -cp->partition_root_state;
2282 				WRITE_ONCE(cp->prs_err,
2289 		if (!css_tryget_online(&cp->css))
2294 			update_parent_effective_cpumask(cp, partcmd_update, NULL, tmp);
2299 			new_prs = cp->partition_root_state;
2303 		cpumask_copy(cp->effective_cpus, tmp->new_cpus);
2304 		cp->partition_root_state = new_prs;
2309 		if ((new_prs > 0) && cpumask_empty(cp->exclusive_cpus))
2310 			cpumask_and(cp->effective_xcpus,
2311 				    cp->cpus_allowed, parent->effective_xcpus);
2313 			reset_partition_data(cp);
2316 		notify_partition_change(cp, old_prs);
2319 			!cpumask_equal(cp->cpus_allowed, cp->effective_cpus));
2321 		update_tasks_cpumask(cp, cp->effective_cpus);
2329 		    !is_partition_valid(cp) &&
2330 		    (is_sched_load_balance(parent) != is_sched_load_balance(cp))) {
2332 				set_bit(CS_SCHED_LOAD_BALANCE, &cp->flags);
2334 				clear_bit(CS_SCHED_LOAD_BALANCE, &cp->flags);
2343 		if (!cpumask_empty(cp->cpus_allowed) &&
2344 		    is_sched_load_balance(cp) &&
2346 		    is_partition_valid(cp)))
2350 		css_put(&cp->css);
2489 		struct cpuset *cp;
2500 		cpuset_for_each_child(cp, css, parent) {
2503 			if (is_partition_valid(cp) &&
2504 			    cpumask_intersects(xcpus, cp->effective_xcpus)) {
2506 				update_parent_effective_cpumask(cp, partcmd_invalidate, NULL, &tmp);
2822 	struct cpuset *cp;
2826 	cpuset_for_each_descendant_pre(cp, pos_css, cs) {
2827 		struct cpuset *parent = parent_cs(cp);
2829 		nodes_and(*new_mems, cp->mems_allowed, parent->effective_mems);
2839 		if (nodes_equal(*new_mems, cp->effective_mems)) {
2844 		if (!css_tryget_online(&cp->css))
2849 		cp->effective_mems = *new_mems;
2853 			!nodes_equal(cp->mems_allowed, cp->effective_mems));
2855 		update_tasks_nodemask(cp);
2858 		css_put(&cp->css);