linux-master/mm/vmpressure.c

26  * we try to analyze scanned/reclaimed ratio. So the window is used as a
42  * scanned/reclaimed ratio. The current values were chosen empirically. In
121 						    unsigned long reclaimed)
123 	unsigned long scale = scanned + reclaimed;
127 	 * reclaimed can be greater than scanned for things such as reclaimed
128 	 * slab pages. shrink_node() just adds reclaimed pages without a
131 	if (reclaimed >= scanned)
135 	 * scanned vs. reclaimed in a given time frame (window). Note that
140 	pressure = scale - (reclaimed * scale / scanned);
145 		 scanned, reclaimed);
184 	unsigned long reclaimed;
196 	 * vmpr->reclaimed is in sync.
204 	reclaimed = vmpr->tree_reclaimed;
209 	level = vmpressure_calc_level(scanned, reclaimed);
219  * vmpressure() - Account memory pressure through scanned/reclaimed ratio
224  * @reclaimed:	number of pages reclaimed
227  * "instantaneous" memory pressure (scanned/reclaimed ratio). The raw
240 		unsigned long scanned, unsigned long reclaimed)
285 		vmpr->tree_reclaimed += reclaimed;
300 		reclaimed = vmpr->reclaimed += reclaimed;
305 		vmpr->scanned = vmpr->reclaimed = 0;
308 		level = vmpressure_calc_level(scanned, reclaimed);
347 	 * range vmscan. Passing scanned = vmpressure_win, reclaimed = 0