From: Waiman Long <longman@redhat.com>
To: Alexander Viro <viro@zeniv.linux.org.uk>,
Jonathan Corbet <corbet@lwn.net>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org, linux-doc@vger.kernel.org,
"Luis R. Rodriguez" <mcgrof@kernel.org>,
Kees Cook <keescook@chromium.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Jan Kara <jack@suse.cz>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>,
Miklos Szeredi <mszeredi@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Larry Woodman <lwoodman@redhat.com>,
James Bottomley <James.Bottomley@HansenPartnership.com>,
"Wangkai (Kevin C)" <wangkai86@huawei.com>,
Michal Hocko <mhocko@kernel.org>,
Waiman Long <longman@redhat.com>
Subject: [PATCH v2 2/4] fs: Don't need to put list_lru into its own cacheline
Date: Thu, 30 Aug 2018 17:55:05 -0400 [thread overview]
Message-ID: <1535666107-25699-3-git-send-email-longman@redhat.com> (raw)
In-Reply-To: <1535666107-25699-1-git-send-email-longman@redhat.com>
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>
---
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
next prev parent reply other threads:[~2018-08-30 21:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-30 21:55 [PATCH v2 0/4] fs/dcache: Track # of negative dentries Waiman Long
2018-08-30 21:55 ` [PATCH v2 1/4] fs/dcache: Fix incorrect nr_dentry_unused accounting in shrink_dcache_sb() Waiman Long
2018-08-30 21:55 ` Waiman Long [this message]
2018-08-30 21:55 ` [PATCH v2 3/4] fs/dcache: Track & report number of negative dentries Waiman Long
2018-08-30 21:55 ` [PATCH v2 4/4] fs/dcache: Eliminate branches in nr_dentry_negative accounting Waiman Long
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