diff options
| -rw-r--r-- | mm/mlock.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/mm/mlock.c b/mm/mlock.c index 7debb4fdf79..bd34b3a1085 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -110,7 +110,15 @@ void munlock_vma_page(struct page *page) if (TestClearPageMlocked(page)) { dec_zone_page_state(page, NR_MLOCK); if (!isolate_lru_page(page)) { - int ret = try_to_munlock(page); + int ret = SWAP_AGAIN; + + /* + * Optimization: if the page was mapped just once, + * that's our mapping and we don't need to check all the + * other vmas. + */ + if (page_mapcount(page) > 1) + ret = try_to_munlock(page); /* * did try_to_unlock() succeed or punt? */ |