mm: vmscan: don't need allocate shrinker->nr_deferred for memcg aware shrinkers

Now nr_deferred is available on per memcg level for memcg aware
shrinkers, so don't need allocate shrinker->nr_deferred for such
shrinkers anymore.

The prealloc_memcg_shrinker() would return -ENOSYS if !CONFIG_MEMCG or
memcg is disabled by kernel command line, then shrinker's
SHRINKER_MEMCG_AWARE flag would be cleared.  This makes the
implementation of this patch simpler.

Link: https://lkml.kernel.org/r/20210311190845.9708-12-shy828301@gmail.com
Signed-off-by: Yang Shi <shy828301@gmail.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Acked-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 19b134d..9617c5f 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -346,6 +346,9 @@ static int prealloc_memcg_shrinker(struct shrinker *shrinker)
 {
        int id, ret = -ENOMEM;
 
+       if (mem_cgroup_disabled())
+               return -ENOSYS;
+
        down_write(&shrinker_rwsem);
        /* This may call shrinker, so it must use down_read_trylock() */
        id = idr_alloc(&shrinker_idr, shrinker, 0, 0, GFP_KERNEL);
@@ -425,7 +428,7 @@ static bool writeback_throttling_sane(struct scan_control *sc)
 #else
 static int prealloc_memcg_shrinker(struct shrinker *shrinker)
 {
-       return 0;
+       return -ENOSYS;
 }
 
 static void unregister_memcg_shrinker(struct shrinker *shrinker)
@@ -537,8 +540,18 @@ static unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru,
  */
 int prealloc_shrinker(struct shrinker *shrinker)
 {
-       unsigned int size = sizeof(*shrinker->nr_deferred);
+       unsigned int size;
+       int err;
+
+       if (shrinker->flags & SHRINKER_MEMCG_AWARE) {
+               err = prealloc_memcg_shrinker(shrinker);
+               if (err != -ENOSYS)
+                       return err;
 
+               shrinker->flags &= ~SHRINKER_MEMCG_AWARE;
+       }
+
+       size = sizeof(*shrinker->nr_deferred);
        if (shrinker->flags & SHRINKER_NUMA_AWARE)
                size *= nr_node_ids;
 
@@ -546,28 +559,16 @@ int prealloc_shrinker(struct shrinker *shrinker)
        if (!shrinker->nr_deferred)
                return -ENOMEM;
 
-       if (shrinker->flags & SHRINKER_MEMCG_AWARE) {
-               if (prealloc_memcg_shrinker(shrinker))
-                       goto free_deferred;
-       }
-
        return 0;
-
-free_deferred:
-       kfree(shrinker->nr_deferred);
-       shrinker->nr_deferred = NULL;
-       return -ENOMEM;
 }
 
 void free_prealloced_shrinker(struct shrinker *shrinker)
 {
-       if (!shrinker->nr_deferred)
-               return;
-
        if (shrinker->flags & SHRINKER_MEMCG_AWARE) {
                down_write(&shrinker_rwsem);
                unregister_memcg_shrinker(shrinker);
                up_write(&shrinker_rwsem);
+               return;
        }
 
        kfree(shrinker->nr_deferred);