mm: remove lru type checks from __isolate_lru_page()

After patch "mm: forbid lumpy-reclaim in shrink_active_list()" we can
completely remove anon/file and active/inactive lru type filters from
__isolate_lru_page(), because isolation for 0-order reclaim always
isolates pages from right lru list.  And pages-isolation for lumpy
shrink_inactive_list() or memory-compaction anyway allowed to isolate
pages from all evictable lru lists.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Glauber Costa <glommer@parallels.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 10 insertions, 29 deletions

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 1b89861eedc0..5c4880bc027a 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -209,16 +209,12 @@ struct lruvec {
 #define LRU_ALL_EVICTABLE (LRU_ALL_FILE | LRU_ALL_ANON)
 #define LRU_ALL      ((1 << NR_LRU_LISTS) - 1)
 
-/* Isolate inactive pages */
-#define ISOLATE_INACTIVE        ((__force isolate_mode_t)0x1)
-/* Isolate active pages */
-#define ISOLATE_ACTIVE          ((__force isolate_mode_t)0x2)
 /* Isolate clean file */
-#define ISOLATE_CLEAN           ((__force isolate_mode_t)0x4)
+#define ISOLATE_CLEAN           ((__force isolate_mode_t)0x1)
 /* Isolate unmapped file */
-#define ISOLATE_UNMAPPED        ((__force isolate_mode_t)0x8)
+#define ISOLATE_UNMAPPED        ((__force isolate_mode_t)0x2)
 /* Isolate for asynchronous migration */
-#define ISOLATE_ASYNC_MIGRATE   ((__force isolate_mode_t)0x10)
+#define ISOLATE_ASYNC_MIGRATE   ((__force isolate_mode_t)0x4)
 
 /* LRU Isolation modes. */
 typedef unsigned __bitwise__ isolate_mode_t;
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 49c0fa9ef5cf..ff38eb7c0ec4 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -251,7 +251,7 @@ static inline void lru_cache_add_file(struct page *page)
 /* linux/mm/vmscan.c */
 extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
                                         gfp_t gfp_mask, nodemask_t *mask);
-extern int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file);
+extern int __isolate_lru_page(struct page *page, isolate_mode_t mode);
 extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem,
                                                   gfp_t gfp_mask, bool noswap);
 extern unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
diff --git a/mm/compaction.c b/mm/compaction.c
index 840ee288e296..74e1b3803839 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -226,7 +226,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
         unsigned long last_pageblock_nr = 0, pageblock_nr;
         unsigned long nr_scanned = 0, nr_isolated = 0;
         struct list_head *migratelist = &cc->migratepages;
-        isolate_mode_t mode = ISOLATE_ACTIVE|ISOLATE_INACTIVE;
+        isolate_mode_t mode = 0;
 
         /*
          * Ensure that there are not too many pages isolated from the LRU
@@ -329,7 +329,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
                         mode |= ISOLATE_ASYNC_MIGRATE;
 
                 /* Try isolate the page */
-                if (__isolate_lru_page(page, mode, 0) != 0)
+                if (__isolate_lru_page(page, mode) != 0)
                         continue;
 
                 VM_BUG_ON(PageTransCompound(page));
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 987be819fad6..27ef5769b9e4 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -949,29 +949,14 @@ keep:
  *
  * returns 0 on success, -ve errno on failure.
  */
-int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file)
+int __isolate_lru_page(struct page *page, isolate_mode_t mode)
 {
-        bool all_lru_mode;
         int ret = -EINVAL;
 
         /* Only take pages on the LRU. */
         if (!PageLRU(page))
                 return ret;
 
-        all_lru_mode = (mode & (ISOLATE_ACTIVE|ISOLATE_INACTIVE)) ==
-                (ISOLATE_ACTIVE|ISOLATE_INACTIVE);
-
-        /*
-         * When checking the active state, we need to be sure we are
-         * dealing with comparible boolean values.  Take the logical not
-         * of each.
-         */
-        if (!all_lru_mode && !PageActive(page) != !(mode & ISOLATE_ACTIVE))
-                return ret;
-
-        if (!all_lru_mode && !!page_is_file_cache(page) != file)
-                return ret;
-
         /* Do not give back unevictable pages for compaction */
         if (PageUnevictable(page))
                 return ret;
@@ -1070,7 +1055,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
 
                 VM_BUG_ON(!PageLRU(page));
 
-                switch (__isolate_lru_page(page, mode, file)) {
+                switch (__isolate_lru_page(page, mode)) {
                 case 0:
                         mem_cgroup_lru_del(page);
                         list_move(&page->lru, dst);
@@ -1282,7 +1267,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct mem_cgroup_zone *mz,
         unsigned long nr_file;
         unsigned long nr_dirty = 0;
         unsigned long nr_writeback = 0;
-        isolate_mode_t isolate_mode = ISOLATE_INACTIVE;
+        isolate_mode_t isolate_mode = 0;
         int file = is_file_lru(lru);
         struct zone *zone = mz->zone;
         struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
@@ -1452,7 +1437,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
         struct page *page;
         struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(mz);
         unsigned long nr_rotated = 0;
-        isolate_mode_t isolate_mode = ISOLATE_ACTIVE;
+        isolate_mode_t isolate_mode = 0;
         int file = is_file_lru(lru);
         struct zone *zone = mz->zone;