linux-kernel - [PATCH] kernfs: account kernfs_node

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Date:   Fri, 26 Jan 2018 14:47:20 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>
Subject: [PATCH] kernfs: account kernfs_node_cache as reclaimable

Similar to commit df206988e03e
("fs: fuse: account fuse_inode slab memory as reclaimable"), these
kernfs nodes are currently included in the unreclaimable slab counts -
SUnreclaim in /proc/meminfo. And they are reclaimable too and can be
freed by kernfs_evict_inode() via /proc/sys/vm/drop_caches easily.

Mark the slab cache reclaimable.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Tejun Heo <tj@...nel.org>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
 fs/kernfs/mount.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index 26dd9a50f383..66a699d06c9a 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -411,6 +411,6 @@ void __init kernfs_init(void)
 	kernfs_node_cache = kmem_cache_create("kernfs_node_cache",
 					      sizeof(struct kernfs_node),
 					      0,
-					      SLAB_PANIC | SLAB_TYPESAFE_BY_RCU,
+					      SLAB_PANIC | SLAB_TYPESAFE_BY_RCU | SLAB_RECLAIM_ACCOUNT,
 					      NULL);
 }
-- 
2.13.0