Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

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

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 <riel@redhat.com>
Signed-off-by: default avatarAndrea Arcangeli <aarcange@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2c888cfb

mm/vmscan.c

+3 −2
Original line number Diff line number Diff line
@@ -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);

			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);
@@ -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++;

			nr_rotated += hpage_nr_pages(page);

			/*

			 * Identify referenced, file-backed active pages and

			 * give them one more trip around the active list. So