thp: scale nr_rotated to balance memory pressure (9992af10) · Commits · 戴 / test

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> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

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

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