45  * page_counter_cancel - take pages out of the local counter
46  * @counter: counter
49 void page_counter_cancel(struct page_counter *counter, unsigned long nr_pages)  in page_counter_cancel()  argument
53 	new = atomic_long_sub_return(nr_pages, &counter->usage);  in page_counter_cancel()
58 		atomic_long_set(&counter->usage, new);  in page_counter_cancel()
60 	propagate_protected_usage(counter, new);  in page_counter_cancel()
65  * @counter: counter
68  * NOTE: This does not consider any configured counter limits.
70 void page_counter_charge(struct page_counter *counter, unsigned long nr_pages)  in page_counter_charge()  argument
74 	for (c = counter; c; c = c->parent) {  in page_counter_charge()
90  * @counter: counter
92  * @fail: points first counter to hit its limit, if any
94  * Returns %true on success, or %false and @fail if the counter or one
97 bool page_counter_try_charge(struct page_counter *counter,  in page_counter_try_charge()  argument
103 	for (c = counter; c; c = c->parent) {  in page_counter_try_charge()
117 		 * counter has changed and retries.  in page_counter_try_charge()
142 	for (c = counter; c != *fail; c = c->parent)  in page_counter_try_charge()
150  * @counter: counter
153 void page_counter_uncharge(struct page_counter *counter, unsigned long nr_pages)  in page_counter_uncharge()  argument
157 	for (c = counter; c; c = c->parent)  in page_counter_uncharge()
163  * @counter: counter
167  * counter already exceeds the specified limit.
169  * The caller must serialize invocations on the same counter.
171 int page_counter_set_max(struct page_counter *counter, unsigned long nr_pages)  in page_counter_set_max()  argument
179 		 * below the concurrently-changing counter value.  in page_counter_set_max()
186 		 * modified counter and retry.  in page_counter_set_max()
188 		usage = page_counter_read(counter);  in page_counter_set_max()
193 		old = xchg(&counter->max, nr_pages);  in page_counter_set_max()
195 		if (page_counter_read(counter) <= usage || nr_pages >= old)  in page_counter_set_max()
198 		counter->max = old;  in page_counter_set_max()
205  * @counter: counter
208  * The caller must serialize invocations on the same counter.
210 void page_counter_set_min(struct page_counter *counter, unsigned long nr_pages)  in page_counter_set_min()  argument
214 	WRITE_ONCE(counter->min, nr_pages);  in page_counter_set_min()
216 	for (c = counter; c; c = c->parent)  in page_counter_set_min()
222  * @counter: counter
225  * The caller must serialize invocations on the same counter.
227 void page_counter_set_low(struct page_counter *counter, unsigned long nr_pages)  in page_counter_set_low()  argument
231 	WRITE_ONCE(counter->low, nr_pages);  in page_counter_set_low()
233 	for (c = counter; c; c = c->parent)  in page_counter_set_low()
238  * page_counter_memparse - memparse() for page counter limits