[PATCH 64 of 66] scale nr_rotated to balance memory pressure

Andrea Arcangeli
2010-11-03T15:31:31Z

From: Rik van Riel <riel@redhat.com>

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: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
---

diff --git a/mm/vmscan.c b/mm/vmscan.c
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1259,7 +1259,8 @@ putback_lru_pages(struct zone *zone, str
add_page_to_lru_list(zone, page, lru);
if (is_active_lru(lru)) {
int file = is_file_lru(lru);
- reclaim_stat->recent_rotated[file]++;
+ int numpages = hpage_nr_pages(page);
+ reclaim_stat->recent_rotated[file] += numpages;
}
if (!pagevec_add(&pvec, page)) {
spin_unlock_irq(&zone->lru_lock);
@@ -1535,7 +1536,7 @@ static void shrink_active_list(unsigned
}

if (page_referenced(page, 0, sc->mem_cgroup, &vm_flags)) {
- nr_rotated++;
+ nr_rotated += hpage_nr_pages(page);
/*
* Identify referenced, file-backed active pages and
* give them one more trip around the active list. So