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Message-Id: <1548874358-6189-3-git-send-email-longman@redhat.com>
Date: Wed, 30 Jan 2019 13:52:37 -0500
From: Waiman Long <longman@...hat.com>
To: Alexander Viro <viro@...iv.linux.org.uk>,
Jonathan Corbet <corbet@....net>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-mm@...ck.org, linux-doc@...r.kernel.org,
"Luis R. Rodriguez" <mcgrof@...nel.org>,
Kees Cook <keescook@...omium.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Jan Kara <jack@...e.cz>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Ingo Molnar <mingo@...nel.org>,
Miklos Szeredi <mszeredi@...hat.com>,
Matthew Wilcox <willy@...radead.org>,
Larry Woodman <lwoodman@...hat.com>,
James Bottomley <James.Bottomley@...senPartnership.com>,
"Wangkai (Kevin C)" <wangkai86@...wei.com>,
Michal Hocko <mhocko@...nel.org>,
Waiman Long <longman@...hat.com>
Subject: [RESEND PATCH v4 2/3] 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@...hat.com>
Reviewed-by: Dave Chinner <dchinner@...hat.com>
---
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 811c777..29d8e2c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -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;
--
1.8.3.1
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