[PATCH] vmscan: emove obsolete checks from shrink_list() and fix unlikely in refill_inactive_zone()
As suggested by Marcelo:
1. The optimization introduced recently for not calling
page_referenced() during zone reclaim makes two additional checks in
shrink_list unnecessary.
2. The if (unlikely(sc->may_swap)) in refill_inactive_zone is optimized
for the zone_reclaim case. However, most peoples system only does swap.
Undo that.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 3914a94..f713e9f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -460,12 +460,9 @@
* Anonymous process memory has backing store?
* Try to allocate it some swap space here.
*/
- if (PageAnon(page) && !PageSwapCache(page)) {
- if (!sc->may_swap)
- goto keep_locked;
+ if (PageAnon(page) && !PageSwapCache(page))
if (!add_to_swap(page, GFP_ATOMIC))
goto activate_locked;
- }
#endif /* CONFIG_SWAP */
mapping = page_mapping(page);
@@ -477,12 +474,6 @@
* processes. Try to unmap it here.
*/
if (page_mapped(page) && mapping) {
- /*
- * No unmapping if we do not swap
- */
- if (!sc->may_swap)
- goto keep_locked;
-
switch (try_to_unmap(page, 0)) {
case SWAP_FAIL:
goto activate_locked;
@@ -1205,7 +1196,7 @@
struct pagevec pvec;
int reclaim_mapped = 0;
- if (unlikely(sc->may_swap)) {
+ if (sc->may_swap) {
long mapped_ratio;
long distress;
long swap_tendency;
