6  * after a certain limit is reached.
8  * Since it is trivial to hit the task limit without hitting any kmemcg limits
21  * To set a cgroup to have no limit, set pids.max to "max". This is the default
23  * stringent limit in the hierarchy is followed).
42 	/* Fork failed in subtree because this pids_cgroup limit was hit. */
44 	/* Fork failed in this pids_cgroup because ancestor limit was hit. */
57 	atomic64_t			limit;  member
87 	atomic64_set(&pids->limit, PIDS_MAX);  in pids_css_alloc()
141  * This function does *not* follow the pid limit set. It cannot fail and the new
142  * pid count may exceed the limit. This is only used for reverting failed
143  * attaches, where there is no other way out than violating the limit.
162  * This function follows the set limit. It will fail if the charge would cause
163  * the new value to exceed the hierarchical limit. Returns 0 if the charge
172 		int64_t limit = atomic64_read(&p->limit);  in pids_try_charge()  local
176 		 * p->limit is %PIDS_MAX then we know that this test will never  in pids_try_charge()
179 		if (new > limit) {  in pids_try_charge()
184 		 * Not technically accurate if we go over limit somewhere up  in pids_try_charge()
248 	/* Only log the first time limit is hit. */  in pids_event()
306 	int64_t limit;  in pids_max_write()  local
311 		limit = PIDS_MAX;  in pids_max_write()
315 	err = kstrtoll(buf, 0, &limit);  in pids_max_write()
319 	if (limit < 0 || limit >= PIDS_MAX)  in pids_max_write()
324 	 * Limit updates don't need to be mutex'd, since it isn't  in pids_max_write()
325 	 * critical that any racing fork()s follow the new limit.  in pids_max_write()
327 	atomic64_set(&pids->limit, limit);  in pids_max_write()
335 	int64_t limit = atomic64_read(&pids->limit);  in pids_max_show()  local
337 	if (limit >= PIDS_MAX)  in pids_max_show()
340 		seq_printf(sf, "%lld\n", limit);  in pids_max_show()