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-rw-r--r--mm/vmscan.c42
1 files changed, 29 insertions, 13 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 87e4d6a..ae3bf0a 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1642,18 +1642,6 @@ static void move_active_pages_to_lru(struct zone *zone,
unsigned long pgmoved = 0;
struct page *page;
- if (buffer_heads_over_limit) {
- spin_unlock_irq(&zone->lru_lock);
- list_for_each_entry(page, list, lru) {
- if (page_has_private(page) && trylock_page(page)) {
- if (page_has_private(page))
- try_to_release_page(page, 0);
- unlock_page(page);
- }
- }
- spin_lock_irq(&zone->lru_lock);
- }
-
while (!list_empty(list)) {
struct lruvec *lruvec;
@@ -1735,6 +1723,14 @@ static void shrink_active_list(unsigned long nr_to_scan,
continue;
}
+ if (unlikely(buffer_heads_over_limit)) {
+ if (page_has_private(page) && trylock_page(page)) {
+ if (page_has_private(page))
+ try_to_release_page(page, 0);
+ unlock_page(page);
+ }
+ }
+
if (page_referenced(page, 0, mz->mem_cgroup, &vm_flags)) {
nr_rotated += hpage_nr_pages(page);
/*
@@ -2238,6 +2234,14 @@ static bool shrink_zones(int priority, struct zonelist *zonelist,
unsigned long nr_soft_scanned;
bool aborted_reclaim = false;
+ /*
+ * If the number of buffer_heads in the machine exceeds the maximum
+ * allowed level, force direct reclaim to scan the highmem zone as
+ * highmem pages could be pinning lowmem pages storing buffer_heads
+ */
+ if (buffer_heads_over_limit)
+ sc->gfp_mask |= __GFP_HIGHMEM;
+
for_each_zone_zonelist_nodemask(zone, z, zonelist,
gfp_zone(sc->gfp_mask), sc->nodemask) {
if (!populated_zone(zone))
@@ -2727,6 +2731,17 @@ loop_again:
*/
age_active_anon(zone, &sc, priority);
+ /*
+ * If the number of buffer_heads in the machine
+ * exceeds the maximum allowed level and this node
+ * has a highmem zone, force kswapd to reclaim from
+ * it to relieve lowmem pressure.
+ */
+ if (buffer_heads_over_limit && is_highmem_idx(i)) {
+ end_zone = i;
+ break;
+ }
+
if (!zone_watermark_ok_safe(zone, order,
high_wmark_pages(zone), 0, 0)) {
end_zone = i;
@@ -2802,7 +2817,8 @@ loop_again:
COMPACT_SKIPPED)
testorder = 0;
- if (!zone_watermark_ok_safe(zone, testorder,
+ if ((buffer_heads_over_limit && is_highmem_idx(i)) ||
+ !zone_watermark_ok_safe(zone, order,
high_wmark_pages(zone) + balance_gap,
end_zone, 0)) {
shrink_zone(priority, zone, &sc);