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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: 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>
This commit is contained in:
Rik van Riel 2011-01-13 15:47:13 -08:00 committed by Linus Torvalds
parent 2c888cfbc1
commit 9992af1029
1 changed files with 3 additions and 2 deletions
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5
mm/vmscan.c
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@ -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