fs: propagate shrinker::id to list_lru

Add list_lru::shrinker_id field and populate it by registered shrinker
id.

This will be used to set correct bit in memcg shrinkers map by lru code
in next patches, after there appeared the first related to memcg element
in list_lru.

Link: http://lkml.kernel.org/r/153063059758.1818.14866596416857717800.stgit@localhost.localdomain
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Acked-by: Vladimir Davydov <vdavydov.dev@gmail.com>
Tested-by: Shakeel Butt <shakeelb@google.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Josef Bacik <jbacik@fb.com>
Cc: Li RongQing <lirongqing@baidu.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Matthias Kaehlcke <mka@chromium.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Sahitya Tummala <stummala@codeaurora.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Waiman Long <longman@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 23 insertions, 9 deletions

diff --git a/fs/super.c b/fs/super.c
index 78227c4ddb21..f5f96e52e0cd 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -261,9 +261,9 @@ static struct super_block *alloc_super(struct file_system_type *type, int flags,
         s->s_shrink.flags = SHRINKER_NUMA_AWARE | SHRINKER_MEMCG_AWARE;
         if (prealloc_shrinker(&s->s_shrink))
                 goto fail;
-        if (list_lru_init_memcg(&s->s_dentry_lru))
+        if (list_lru_init_memcg(&s->s_dentry_lru, &s->s_shrink))
                 goto fail;
-        if (list_lru_init_memcg(&s->s_inode_lru))
+        if (list_lru_init_memcg(&s->s_inode_lru, &s->s_shrink))
                 goto fail;
         return s;
 
diff --git a/include/linux/list_lru.h b/include/linux/list_lru.h
index 2d23b5b745be..9e75bb33766b 100644
--- a/include/linux/list_lru.h
+++ b/include/linux/list_lru.h
@@ -53,16 +53,20 @@ struct list_lru {
         struct list_lru_node    *node;
 #ifdef CONFIG_MEMCG_KMEM
         struct list_head        list;
+        int                     shrinker_id;
 #endif
 };
 
 void list_lru_destroy(struct list_lru *lru);
 int __list_lru_init(struct list_lru *lru, bool memcg_aware,
-                    struct lock_class_key *key);
-
-#define list_lru_init(lru)              __list_lru_init((lru), false, NULL)
-#define list_lru_init_key(lru, key)     __list_lru_init((lru), false, (key))
-#define list_lru_init_memcg(lru)        __list_lru_init((lru), true, NULL)
+                    struct lock_class_key *key, struct shrinker *shrinker);
+
+#define list_lru_init(lru)                              \
+        __list_lru_init((lru), false, NULL, NULL)
+#define list_lru_init_key(lru, key)                     \
+        __list_lru_init((lru), false, (key), NULL)
+#define list_lru_init_memcg(lru, shrinker)              \
+        __list_lru_init((lru), true, NULL, shrinker)
 
 int memcg_update_all_list_lrus(int num_memcgs);
 void memcg_drain_all_list_lrus(int src_idx, int dst_idx);
diff --git a/mm/list_lru.c b/mm/list_lru.c
index c5217d84c6e1..5aebbb9b2f5b 100644
--- a/mm/list_lru.c
+++ b/mm/list_lru.c
@@ -546,12 +546,18 @@ static void memcg_destroy_list_lru(struct list_lru *lru)
 #endif /* CONFIG_MEMCG_KMEM */
 
 int __list_lru_init(struct list_lru *lru, bool memcg_aware,
-                    struct lock_class_key *key)
+                    struct lock_class_key *key, struct shrinker *shrinker)
 {
         int i;
         size_t size = sizeof(*lru->node) * nr_node_ids;
         int err = -ENOMEM;
 
+#ifdef CONFIG_MEMCG_KMEM
+        if (shrinker)
+                lru->shrinker_id = shrinker->id;
+        else
+                lru->shrinker_id = -1;
+#endif
         memcg_get_cache_ids();
 
         lru->node = kzalloc(size, GFP_KERNEL);
@@ -594,6 +600,9 @@ void list_lru_destroy(struct list_lru *lru)
         kfree(lru->node);
         lru->node = NULL;
 
+#ifdef CONFIG_MEMCG_KMEM
+        lru->shrinker_id = -1;
+#endif
         memcg_put_cache_ids();
 }
 EXPORT_SYMBOL_GPL(list_lru_destroy);
diff --git a/mm/workingset.c b/mm/workingset.c
index 4e0b2523aae2..cd0b2ae615e4 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -526,7 +526,8 @@ static int __init workingset_init(void)
         ret = prealloc_shrinker(&workingset_shadow_shrinker);
         if (ret)
                 goto err;
-        ret = __list_lru_init(&shadow_nodes, true, &shadow_nodes_key);
+        ret = __list_lru_init(&shadow_nodes, true, &shadow_nodes_key,
+                              &workingset_shadow_shrinker);
         if (ret)
                 goto err_list_lru;
         register_shrinker_prepared(&workingset_shadow_shrinker);