51  * page_counter_cancel - take pages out of the local counter
52  * @counter: counter
55 void page_counter_cancel(struct page_counter *counter, unsigned long nr_pages)  in page_counter_cancel()  argument
59 	new = atomic_long_sub_return(nr_pages, &counter->usage);  in page_counter_cancel()
60 	propagate_protected_usage(counter, new);  in page_counter_cancel()
67  * @counter: counter
70  * NOTE: This does not consider any configured counter limits.
72 void page_counter_charge(struct page_counter *counter, unsigned long nr_pages)  in page_counter_charge()  argument
76 	for (c = counter; c; c = c->parent) {  in page_counter_charge()
92  * @counter: counter
94  * @fail: points first counter to hit its limit, if any
96  * Returns %true on success, or %false and @fail if the counter or one
99 bool page_counter_try_charge(struct page_counter *counter,  in page_counter_try_charge()  argument
105 	for (c = counter; c; c = c->parent) {  in page_counter_try_charge()
119 		 * 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 = atomic_long_read(&counter->usage);  in page_counter_set_max()
195 		old = xchg(&counter->max, nr_pages);  in page_counter_set_max()
197 		if (atomic_long_read(&counter->usage) <= 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 	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 	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