The list_lru structure is essentially just a pointer to a table of
per-node LRU lists. Even if CONFIG_MEMCG_KMEM is defined, the list
field is just used for LRU list registration and shrinker_id is set
at initialization. Those fields won't need to be touched that often.
So there is no point to make the list_lru structures to sit in their
own cachelines.
Signed-off-by: Waiman Long <longman@xxxxxxxxxx>
---
include/linux/fs.h | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3332270..fd4cd8a 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1443,11 +1443,12 @@ struct super_block {
struct user_namespace *s_user_ns;
/*
- * Keep the lru lists last in the structure so they always sit on their
- * own individual cachelines.
+ * The list_lru structure is essentially just a pointer to a table
+ * of per-node lru lists, each of which has its own spinlock.
+ * There is no need to put them into separate cachelines.
*/
- struct list_lru s_dentry_lru ____cacheline_aligned_in_smp;
- struct list_lru s_inode_lru ____cacheline_aligned_in_smp;
+ struct list_lru s_dentry_lru;
+ struct list_lru s_inode_lru;
struct rcu_head rcu;
struct work_struct destroy_work;
--
1.8.3.1
