46  * page_counter_cancel - take pages out of the local counter
47  * @counter: counter
50 void page_counter_cancel(struct page_counter *counter, unsigned long nr_pages)  in page_counter_cancel()  argument
54 	new = atomic_long_sub_return(nr_pages, &counter->usage);  in page_counter_cancel()
59 		atomic_long_set(&counter->usage, new);  in page_counter_cancel()
61 	propagate_protected_usage(counter, new);  in page_counter_cancel()
66  * @counter: counter
69  * NOTE: This does not consider any configured counter limits.
71 void page_counter_charge(struct page_counter *counter, unsigned long nr_pages)  in page_counter_charge()  argument
75 	for (c = counter; c; c = c->parent) {  in page_counter_charge()
91  * @counter: counter
93  * @fail: points first counter to hit its limit, if any
95  * Returns %true on success, or %false and @fail if the counter or one
98 bool page_counter_try_charge(struct page_counter *counter,  in page_counter_try_charge()  argument
104 	for (c = counter; c; c = c->parent) {  in page_counter_try_charge()
118 		 * counter has changed and retries.  in page_counter_try_charge()
144 	for (c = counter; c != *fail; c = c->parent)  in page_counter_try_charge()
152  * @counter: counter
155 void page_counter_uncharge(struct page_counter *counter, unsigned long nr_pages)  in page_counter_uncharge()  argument
159 	for (c = counter; c; c = c->parent)  in page_counter_uncharge()
165  * @counter: counter
169  * counter already exceeds the specified limit.
171  * The caller must serialize invocations on the same counter.
173 int page_counter_set_max(struct page_counter *counter, unsigned long nr_pages)  in page_counter_set_max()  argument
181 		 * below the concurrently-changing counter value.  in page_counter_set_max()
188 		 * modified counter and retry.  in page_counter_set_max()
190 		usage = page_counter_read(counter);  in page_counter_set_max()
195 		old = xchg(&counter->max, nr_pages);  in page_counter_set_max()
197 		if (page_counter_read(counter) <= usage)  in page_counter_set_max()
200 		counter->max = old;  in page_counter_set_max()
207  * @counter: counter
210  * The caller must serialize invocations on the same counter.
212 void page_counter_set_min(struct page_counter *counter, unsigned long nr_pages)  in page_counter_set_min()  argument
216 	WRITE_ONCE(counter->min, nr_pages);  in page_counter_set_min()
218 	for (c = counter; c; c = c->parent)  in page_counter_set_min()
224  * @counter: counter
227  * The caller must serialize invocations on the same counter.
229 void page_counter_set_low(struct page_counter *counter, unsigned long nr_pages)  in page_counter_set_low()  argument
233 	WRITE_ONCE(counter->low, nr_pages);  in page_counter_set_low()
235 	for (c = counter; c; c = c->parent)  in page_counter_set_low()
240  * page_counter_memparse - memparse() for page counter limits