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-rw-r--r--mm/vmscan.c107
1 files changed, 55 insertions, 52 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 25b0202c60df..8e1d72333e8a 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1514,21 +1514,52 @@ static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
}
/*
+ * Smallish @nr_to_scan's are deposited in @nr_saved_scan,
+ * until we collected @swap_cluster_max pages to scan.
+ */
+static unsigned long nr_scan_try_batch(unsigned long nr_to_scan,
+ unsigned long *nr_saved_scan)
+{
+ unsigned long nr;
+
+ *nr_saved_scan += nr_to_scan;
+ nr = *nr_saved_scan;
+
+ if (nr >= SWAP_CLUSTER_MAX)
+ *nr_saved_scan = 0;
+ else
+ nr = 0;
+
+ return nr;
+}
+
+/*
* Determine how aggressively the anon and file LRU lists should be
* scanned. The relative value of each set of LRU lists is determined
* by looking at the fraction of the pages scanned we did rotate back
* onto the active list instead of evict.
*
- * percent[0] specifies how much pressure to put on ram/swap backed
- * memory, while percent[1] determines pressure on the file LRUs.
+ * nr[0] = anon pages to scan; nr[1] = file pages to scan
*/
-static void get_scan_ratio(struct zone *zone, struct scan_control *sc,
- unsigned long *percent)
+static void get_scan_count(struct zone *zone, struct scan_control *sc,
+ unsigned long *nr, int priority)
{
unsigned long anon, file, free;
unsigned long anon_prio, file_prio;
unsigned long ap, fp;
struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
+ u64 fraction[2], denominator;
+ enum lru_list l;
+ int noswap = 0;
+
+ /* If we have no swap space, do not bother scanning anon pages. */
+ if (!sc->may_swap || (nr_swap_pages <= 0)) {
+ noswap = 1;
+ fraction[0] = 0;
+ fraction[1] = 1;
+ denominator = 1;
+ goto out;
+ }
anon = zone_nr_lru_pages(zone, sc, LRU_ACTIVE_ANON) +
zone_nr_lru_pages(zone, sc, LRU_INACTIVE_ANON);
@@ -1540,9 +1571,10 @@ static void get_scan_ratio(struct zone *zone, struct scan_control *sc,
/* If we have very few page cache pages,
force-scan anon pages. */
if (unlikely(file + free <= high_wmark_pages(zone))) {
- percent[0] = 100;
- percent[1] = 0;
- return;
+ fraction[0] = 1;
+ fraction[1] = 0;
+ denominator = 1;
+ goto out;
}
}
@@ -1589,29 +1621,22 @@ static void get_scan_ratio(struct zone *zone, struct scan_control *sc,
fp = (file_prio + 1) * (reclaim_stat->recent_scanned[1] + 1);
fp /= reclaim_stat->recent_rotated[1] + 1;
- /* Normalize to percentages */
- percent[0] = 100 * ap / (ap + fp + 1);
- percent[1] = 100 - percent[0];
-}
-
-/*
- * Smallish @nr_to_scan's are deposited in @nr_saved_scan,
- * until we collected @swap_cluster_max pages to scan.
- */
-static unsigned long nr_scan_try_batch(unsigned long nr_to_scan,
- unsigned long *nr_saved_scan)
-{
- unsigned long nr;
-
- *nr_saved_scan += nr_to_scan;
- nr = *nr_saved_scan;
-
- if (nr >= SWAP_CLUSTER_MAX)
- *nr_saved_scan = 0;
- else
- nr = 0;
+ fraction[0] = ap;
+ fraction[1] = fp;
+ denominator = ap + fp + 1;
+out:
+ for_each_evictable_lru(l) {
+ int file = is_file_lru(l);
+ unsigned long scan;
- return nr;
+ scan = zone_nr_lru_pages(zone, sc, l);
+ if (priority || noswap) {
+ scan >>= priority;
+ scan = div64_u64(scan * fraction[file], denominator);
+ }
+ nr[l] = nr_scan_try_batch(scan,
+ &reclaim_stat->nr_saved_scan[l]);
+ }
}
/*
@@ -1622,33 +1647,11 @@ static void shrink_zone(int priority, struct zone *zone,
{
unsigned long nr[NR_LRU_LISTS];
unsigned long nr_to_scan;
- unsigned long percent[2]; /* anon @ 0; file @ 1 */
enum lru_list l;
unsigned long nr_reclaimed = sc->nr_reclaimed;
unsigned long nr_to_reclaim = sc->nr_to_reclaim;
- struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc);
- int noswap = 0;
-
- /* If we have no swap space, do not bother scanning anon pages. */
- if (!sc->may_swap || (nr_swap_pages <= 0)) {
- noswap = 1;
- percent[0] = 0;
- percent[1] = 100;
- } else
- get_scan_ratio(zone, sc, percent);
- for_each_evictable_lru(l) {
- int file = is_file_lru(l);
- unsigned long scan;
-
- scan = zone_nr_lru_pages(zone, sc, l);
- if (priority || noswap) {
- scan >>= priority;
- scan = (scan * percent[file]) / 100;
- }
- nr[l] = nr_scan_try_batch(scan,
- &reclaim_stat->nr_saved_scan[l]);
- }
+ get_scan_count(zone, sc, nr, priority);
while (nr[LRU_INACTIVE_ANON] || nr[LRU_ACTIVE_FILE] ||
nr[LRU_INACTIVE_FILE]) {