diff options
Diffstat (limited to 'mm')
-rw-r--r-- | mm/vmscan.c | 25 |
1 files changed, 11 insertions, 14 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 8e477b1a4838..e21bab4deda6 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c | |||
@@ -1083,29 +1083,26 @@ static int isolate_lru_pages(int nr_to_scan, struct list_head *src, | |||
1083 | int scan = 0; | 1083 | int scan = 0; |
1084 | 1084 | ||
1085 | while (scan++ < nr_to_scan && !list_empty(src)) { | 1085 | while (scan++ < nr_to_scan && !list_empty(src)) { |
1086 | struct list_head *target; | ||
1086 | page = lru_to_page(src); | 1087 | page = lru_to_page(src); |
1087 | prefetchw_prev_lru_page(page, src, flags); | 1088 | prefetchw_prev_lru_page(page, src, flags); |
1088 | 1089 | ||
1089 | BUG_ON(!PageLRU(page)); | 1090 | BUG_ON(!PageLRU(page)); |
1090 | 1091 | ||
1091 | list_del(&page->lru); | 1092 | list_del(&page->lru); |
1092 | if (unlikely(get_page_testone(page))) { | 1093 | target = src; |
1094 | if (likely(get_page_unless_zero(page))) { | ||
1093 | /* | 1095 | /* |
1094 | * It is being freed elsewhere | 1096 | * Be careful not to clear PageLRU until after we're |
1097 | * sure the page is not being freed elsewhere -- the | ||
1098 | * page release code relies on it. | ||
1095 | */ | 1099 | */ |
1096 | __put_page(page); | 1100 | ClearPageLRU(page); |
1097 | list_add(&page->lru, src); | 1101 | target = dst; |
1098 | continue; | 1102 | nr_taken++; |
1099 | } | 1103 | } /* else it is being freed elsewhere */ |
1100 | 1104 | ||
1101 | /* | 1105 | list_add(&page->lru, target); |
1102 | * Be careful not to clear PageLRU until after we're sure | ||
1103 | * the page is not being freed elsewhere -- the page release | ||
1104 | * code relies on it. | ||
1105 | */ | ||
1106 | ClearPageLRU(page); | ||
1107 | list_add(&page->lru, dst); | ||
1108 | nr_taken++; | ||
1109 | } | 1106 | } |
1110 | 1107 | ||
1111 | *scanned = scan; | 1108 | *scanned = scan; |