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Date: Tue, 5 May 2020 10:10:35 +0200 From: SeongJae Park <sjpark@...zon.com> To: <davem@...emloft.net> CC: <viro@...iv.linux.org.uk>, <kuba@...nel.org>, <gregkh@...uxfoundation.org>, <edumazet@...gle.com>, <sj38.park@...il.com>, <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>, SeongJae Park <sjpark@...zon.de> Subject: [PATCH net v2 2/2] Revert "sockfs: switch to ->free_inode()" From: SeongJae Park <sjpark@...zon.de> This reverts commit 6d7855c54e1e269275d7c504f8f62a0b7a5b3f18. The commit 6d7855c54e1e ("sockfs: switch to ->free_inode()") made the deallocation of 'socket_alloc' to be done asynchronously using RCU, as same to 'sock.wq'. The change made 'socket_alloc' live longer than before. As a result, user programs intensively repeating allocations and deallocations of sockets could cause memory pressure on recent kernels. To avoid the problem, this commit reverts the change. Fixes: 6d7855c54e1e ("sockfs: switch to ->free_inode()") Fixes: 333f7909a857 ("coallocate socket_sq with socket itself") Signed-off-by: SeongJae Park <sjpark@...zon.de> --- net/socket.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/net/socket.c b/net/socket.c index e274ae4b45e4..27174021f47f 100644 --- a/net/socket.c +++ b/net/socket.c @@ -273,12 +273,12 @@ static struct inode *sock_alloc_inode(struct super_block *sb) return &ei->vfs_inode; } -static void sock_free_inode(struct inode *inode) +static void sock_destroy_inode(struct inode *inode) { struct socket_alloc *ei; ei = container_of(inode, struct socket_alloc, vfs_inode); - kfree(ei->socket.wq); + kfree_rcu(ei->socket.wq, rcu); kmem_cache_free(sock_inode_cachep, ei); } @@ -303,7 +303,7 @@ static void init_inodecache(void) static const struct super_operations sockfs_ops = { .alloc_inode = sock_alloc_inode, - .free_inode = sock_free_inode, + .destroy_inode = sock_destroy_inode, .statfs = simple_statfs, }; -- 2.17.1
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