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authorVladimir Davydov <vdavydov@parallels.com>2015-02-13 01:59:07 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-13 05:54:09 +0300
commitc0a5b560938a0f2fd2fbf66ddc446c7c2b41383a (patch)
treef69922a1bffc5d841d5323ba018a61d2e548db6c
parentff0b67ef5b1687692bc1fd3ce4bc3d1ff83587c7 (diff)
downloadlinux-c0a5b560938a0f2fd2fbf66ddc446c7c2b41383a.tar.xz
list_lru: organize all list_lrus to list
To make list_lru memcg aware, we need all list_lrus to be kept on a list protected by a mutex, so that we could sleep while walking over the list. Therefore after this change list_lru_destroy may sleep. Fortunately, there is only one user that calls it from an atomic context - it's put_super - and we can easily fix it by calling list_lru_destroy before put_super in destroy_locked_super - anyway we don't longer need lrus by that time. Another point that should be noted is that list_lru_destroy is allowed to be called on an uninitialized zeroed-out object, in which case it is a no-op. Before this patch this was guaranteed by kfree, but now we need an explicit check there. Signed-off-by: Vladimir Davydov <vdavydov@parallels.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Greg Thelen <gthelen@google.com> Cc: Glauber Costa <glommer@gmail.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/super.c8
-rw-r--r--include/linux/list_lru.h3
-rw-r--r--mm/list_lru.c34
3 files changed, 45 insertions, 0 deletions
diff --git a/fs/super.c b/fs/super.c
index a2b735a42e74..b027849d92d2 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -282,6 +282,14 @@ void deactivate_locked_super(struct super_block *s)
unregister_shrinker(&s->s_shrink);
fs->kill_sb(s);
+ /*
+ * Since list_lru_destroy() may sleep, we cannot call it from
+ * put_super(), where we hold the sb_lock. Therefore we destroy
+ * the lru lists right now.
+ */
+ list_lru_destroy(&s->s_dentry_lru);
+ list_lru_destroy(&s->s_inode_lru);
+
put_filesystem(fs);
put_super(s);
} else {
diff --git a/include/linux/list_lru.h b/include/linux/list_lru.h
index 53c1d6b78270..ee9486ac0621 100644
--- a/include/linux/list_lru.h
+++ b/include/linux/list_lru.h
@@ -31,6 +31,9 @@ struct list_lru_node {
struct list_lru {
struct list_lru_node *node;
+#ifdef CONFIG_MEMCG_KMEM
+ struct list_head list;
+#endif
};
void list_lru_destroy(struct list_lru *lru);
diff --git a/mm/list_lru.c b/mm/list_lru.c
index 07e198c77888..a9021cb3ccde 100644
--- a/mm/list_lru.c
+++ b/mm/list_lru.c
@@ -9,6 +9,34 @@
#include <linux/mm.h>
#include <linux/list_lru.h>
#include <linux/slab.h>
+#include <linux/mutex.h>
+
+#ifdef CONFIG_MEMCG_KMEM
+static LIST_HEAD(list_lrus);
+static DEFINE_MUTEX(list_lrus_mutex);
+
+static void list_lru_register(struct list_lru *lru)
+{
+ mutex_lock(&list_lrus_mutex);
+ list_add(&lru->list, &list_lrus);
+ mutex_unlock(&list_lrus_mutex);
+}
+
+static void list_lru_unregister(struct list_lru *lru)
+{
+ mutex_lock(&list_lrus_mutex);
+ list_del(&lru->list);
+ mutex_unlock(&list_lrus_mutex);
+}
+#else
+static void list_lru_register(struct list_lru *lru)
+{
+}
+
+static void list_lru_unregister(struct list_lru *lru)
+{
+}
+#endif /* CONFIG_MEMCG_KMEM */
bool list_lru_add(struct list_lru *lru, struct list_head *item)
{
@@ -137,12 +165,18 @@ int list_lru_init_key(struct list_lru *lru, struct lock_class_key *key)
INIT_LIST_HEAD(&lru->node[i].list);
lru->node[i].nr_items = 0;
}
+ list_lru_register(lru);
return 0;
}
EXPORT_SYMBOL_GPL(list_lru_init_key);
void list_lru_destroy(struct list_lru *lru)
{
+ /* Already destroyed or not yet initialized? */
+ if (!lru->node)
+ return;
+ list_lru_unregister(lru);
kfree(lru->node);
+ lru->node = NULL;
}
EXPORT_SYMBOL_GPL(list_lru_destroy);