Fix comment style and elaborate on why anonymous memory is
force-scanned when file cache runs low.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
Acked-by: Mel Gorman <mgorman@xxxxxxx>
Reviewed-by: Michal Hocko <mhocko@xxxxxxx>
---
mm/vmscan.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index c37deaf..510c0d3 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1701,13 +1701,15 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
file = get_lru_size(lruvec, LRU_ACTIVE_FILE) +
get_lru_size(lruvec, LRU_INACTIVE_FILE);
+ /*
+ * If it's foreseeable that reclaiming the file cache won't be
+ * enough to get the zone back into a desirable shape, we have
+ * to swap. Better start now and leave the - probably heavily
+ * thrashing - remaining file pages alone.
+ */
if (global_reclaim(sc)) {
- free = zone_page_state(zone, NR_FREE_PAGES);
+ free = zone_page_state(zone, NR_FREE_PAGES);
if (unlikely(file + free <= high_wmark_pages(zone))) {
- /*
- * If we have very few page cache pages, force-scan
- * anon pages.
- */
fraction[0] = 1;
fraction[1] = 0;
denominator = 1;
--
1.7.11.7
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