X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=mm%2Fmlock.c;h=bd34b3a10852c3d3ac3b1808653721a6114549c2;hb=c18ae42aa5b3473c00f51b6937d0c00bdb6ce2d2;hp=048260c4e02ea7ced2692cc05fba67c9798c9145;hpb=121782a248f11c63c7c0fc78d4a68a54e99ee37d;p=~andy%2Flinux

diff --git a/mm/mlock.c b/mm/mlock.c
index 048260c4e02..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?
 			 */
@@ -549,7 +557,8 @@ SYSCALL_DEFINE1(mlockall, int, flags)
 	if (!can_do_mlock())
 		goto out;
 
-	lru_add_drain_all();	/* flush pagevec */
+	if (flags & MCL_CURRENT)
+		lru_add_drain_all();	/* flush pagevec */
 
 	down_write(&current->mm->mmap_sem);