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-rw-r--r--mm/vmscan.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index c141b3e78071..62e7f62fb559 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -623,6 +623,8 @@ static unsigned long shrink_page_list(struct list_head *page_list,
* Try to allocate it some swap space here.
*/
if (PageAnon(page) && !PageSwapCache(page)) {
+ if (!(sc->gfp_mask & __GFP_IO))
+ goto keep_locked;
switch (try_to_munlock(page)) {
case SWAP_FAIL: /* shouldn't happen */
case SWAP_AGAIN:
@@ -634,6 +636,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
}
if (!add_to_swap(page, GFP_ATOMIC))
goto activate_locked;
+ may_enter_fs = 1;
}
#endif /* CONFIG_SWAP */
@@ -1245,6 +1248,7 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
list_add(&page->lru, &l_inactive);
}
+ spin_lock_irq(&zone->lru_lock);
/*
* Count referenced pages from currently used mappings as
* rotated, even though they are moved to the inactive list.
@@ -1260,7 +1264,6 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
pgmoved = 0;
lru = LRU_BASE + file * LRU_FILE;
- spin_lock_irq(&zone->lru_lock);
while (!list_empty(&l_inactive)) {
page = lru_to_page(&l_inactive);
prefetchw_prev_lru_page(page, &l_inactive, flags);
@@ -1386,9 +1389,9 @@ static void get_scan_ratio(struct zone *zone, struct scan_control *sc,
file_prio = 200 - sc->swappiness;
/*
- * anon recent_rotated[0]
- * %anon = 100 * ----------- / ----------------- * IO cost
- * anon + file rotate_sum
+ * The amount of pressure on anon vs file pages is inversely
+ * proportional to the fraction of recently scanned pages on
+ * each list that were recently referenced and in active use.
*/
ap = (anon_prio + 1) * (zone->recent_scanned[0] + 1);
ap /= zone->recent_rotated[0] + 1;