mm/compaction: avoid rescanning pageblocks in isolate_freepages

[platform/adaptation/renesas_rcar/renesas_kernel.git] / mm / slub.c

diff --git a/mm/slub.c b/mm/slub.c
index 7e3e045..7611f14 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1004,21 +1004,19 @@ static inline void slab_free_hook(struct kmem_cache *s, void *x)
 static void add_full(struct kmem_cache *s,
        struct kmem_cache_node *n, struct page *page)
 {
-       lockdep_assert_held(&n->list_lock);
-
        if (!(s->flags & SLAB_STORE_USER))
                return;
 
+       lockdep_assert_held(&n->list_lock);
        list_add(&page->lru, &n->full);
 }
 
 static void remove_full(struct kmem_cache *s, struct kmem_cache_node *n, struct page *page)
 {
-       lockdep_assert_held(&n->list_lock);
-
        if (!(s->flags & SLAB_STORE_USER))
                return;
 
+       lockdep_assert_held(&n->list_lock);
        list_del(&page->lru);
 }
 
@@ -1520,11 +1518,9 @@ static void discard_slab(struct kmem_cache *s, struct page *page)
 /*
  * Management of partially allocated slabs.
  */
-static inline void add_partial(struct kmem_cache_node *n,
-                               struct page *page, int tail)
+static inline void
+__add_partial(struct kmem_cache_node *n, struct page *page, int tail)
 {
-       lockdep_assert_held(&n->list_lock);
-
        n->nr_partial++;
        if (tail == DEACTIVATE_TO_TAIL)
                list_add_tail(&page->lru, &n->partial);
@@ -1532,15 +1528,27 @@ static inline void add_partial(struct kmem_cache_node *n,
                list_add(&page->lru, &n->partial);
 }
 
-static inline void remove_partial(struct kmem_cache_node *n,
-                                       struct page *page)
+static inline void add_partial(struct kmem_cache_node *n,
+                               struct page *page, int tail)
 {
        lockdep_assert_held(&n->list_lock);
+       __add_partial(n, page, tail);
+}
 
+static inline void
+__remove_partial(struct kmem_cache_node *n, struct page *page)
+{
        list_del(&page->lru);
        n->nr_partial--;
 }
 
+static inline void remove_partial(struct kmem_cache_node *n,
+                                       struct page *page)
+{
+       lockdep_assert_held(&n->list_lock);
+       __remove_partial(n, page);
+}
+
 /*
  * Remove slab from the partial list, freeze it and
  * return the pointer to the freelist.
@@ -1676,7 +1684,7 @@ static void *get_any_partial(struct kmem_cache *s, gfp_t flags,
                return NULL;
 
        do {
-               cpuset_mems_cookie = get_mems_allowed();
+               cpuset_mems_cookie = read_mems_allowed_begin();
                zonelist = node_zonelist(slab_node(), flags);
                for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
                        struct kmem_cache_node *n;
@@ -1688,19 +1696,17 @@ static void *get_any_partial(struct kmem_cache *s, gfp_t flags,
                                object = get_partial_node(s, n, c, flags);
                                if (object) {
                                        /*
-                                        * Return the object even if
-                                        * put_mems_allowed indicated that
-                                        * the cpuset mems_allowed was
-                                        * updated in parallel. It's a
-                                        * harmless race between the alloc
-                                        * and the cpuset update.
+                                        * Don't check read_mems_allowed_retry()
+                                        * here - if mems_allowed was updated in
+                                        * parallel, that was a harmless race
+                                        * between allocation and the cpuset
+                                        * update
                                         */
-                                       put_mems_allowed(cpuset_mems_cookie);
                                        return object;
                                }
                        }
                }
-       } while (!put_mems_allowed(cpuset_mems_cookie));
+       } while (read_mems_allowed_retry(cpuset_mems_cookie));
 #endif
        return NULL;
 }
@@ -2906,12 +2912,10 @@ static void early_kmem_cache_node_alloc(int node)
        inc_slabs_node(kmem_cache_node, node, page->objects);
 
        /*
-        * the lock is for lockdep's sake, not for any actual
-        * race protection
+        * No locks need to be taken here as it has just been
+        * initialized and there is no concurrent access.
         */
-       spin_lock(&n->list_lock);
-       add_partial(n, page, DEACTIVATE_TO_HEAD);
-       spin_unlock(&n->list_lock);
+       __add_partial(n, page, DEACTIVATE_TO_HEAD);
 }
 
 static void free_kmem_cache_nodes(struct kmem_cache *s)
@@ -3197,7 +3201,7 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n)
 
        list_for_each_entry_safe(page, h, &n->partial, lru) {
                if (!page->inuse) {
-                       remove_partial(n, page);
+                       __remove_partial(n, page);
                        discard_slab(s, page);
                } else {
                        list_slab_objects(s, page,