Commit 9992af10 authored by Rik van Riel's avatar Rik van Riel Committed by Linus Torvalds

thp: scale nr_rotated to balance memory pressure

Make sure we scale up nr_rotated when we encounter a referenced
transparent huge page.  This ensures pageout scanning balance is not
distorted when there are huge pages on the LRU.
Signed-off-by: default avatarRik van Riel <>
Signed-off-by: default avatarAndrea Arcangeli <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 2c888cfb
......@@ -1276,7 +1276,8 @@ putback_lru_pages(struct zone *zone, struct scan_control *sc,
add_page_to_lru_list(zone, page, lru);
if (is_active_lru(lru)) {
int file = is_file_lru(lru);
int numpages = hpage_nr_pages(page);
reclaim_stat->recent_rotated[file] += numpages;
if (!pagevec_add(&pvec, page)) {
......@@ -1552,7 +1553,7 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
if (page_referenced(page, 0, sc->mem_cgroup, &vm_flags)) {
nr_rotated += hpage_nr_pages(page);
* Identify referenced, file-backed active pages and
* give them one more trip around the active list. So
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