Commit 7d10f70f authored Jan 30, 2019 by Waiman Long Committed by Linus Torvalds Jan 30, 2019

fs: Don't need to put list_lru into its own cacheline



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@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 1dbd449c

include/linux/fs.h

+5 −4

Original line number	Diff line number	Diff line
		@@ -1479,11 +1479,12 @@ 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;