[PATCH] rmap don't test rss

[PATCH] rmap don't test rss

[Hugh Dickins]

Remove the three get_mm_counter(mm, rss) tests from rmap.c: there was a
time when testing rss was important to avoid a particular race between
dup_mmap and the anonmm rmap; but now it's just a rather silly pseudo-
optimization, made even more obscure by the get_mm_counter macro.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
---

 mm/rmap.c |    7 +------
 1 files changed, 1 insertion(+), 6 deletions(-)

--- 2.6.13-rc2-mm1/mm/rmap.c	2005-07-07 12:33:21.000000000 +0100
+++ linux/mm/rmap.c	2005-07-09 01:20:41.000000000 +0100
@@ -290,8 +290,6 @@ static int page_referenced_one(struct pa
 	pte_t *pte;
 	int referenced = 0;
 
-	if (!get_mm_counter(mm, rss))
-		goto out;
 	address = vma_address(page, vma);
 	if (address == -EFAULT)
 		goto out;
@@ -522,8 +520,6 @@ static int try_to_unmap_one(struct page 
 	pte_t pteval;
 	int ret = SWAP_AGAIN;
 
-	if (!get_mm_counter(mm, rss))
-		goto out;
 	address = vma_address(page, vma);
 	if (address == -EFAULT)
 		goto out;
@@ -771,8 +767,7 @@ static int try_to_unmap_file(struct page
 			if (vma->vm_flags & (VM_LOCKED|VM_RESERVED))
 				continue;
 			cursor = (unsigned long) vma->vm_private_data;
-			while (get_mm_counter(vma->vm_mm, rss) &&
-				cursor < max_nl_cursor &&
+			while ( cursor < max_nl_cursor &&
 				cursor < vma->vm_end - vma->vm_start) {
 				try_to_unmap_cluster(cursor, &mapcount, vma);
 				cursor += CLUSTER_SIZE;