linux-kernel - [PATCH net v2 0/2] Revert the 'socket

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Date:   Tue, 5 May 2020 10:10:33 +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 0/2] Revert the 'socket_alloc' life cycle change

From: SeongJae Park <sjpark@...zon.de>

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'.  And the following commit 333f7909a857 ("coallocate
socket_sq with socket itself") made those to have same life cycle.

The changes made the code much more simple, but also made 'socket_alloc'
live longer than before.  For the reason, user programs intensively
repeating allocations and deallocations of sockets could cause memory
pressure on recent kernels.

To avoid the problem, this commit reverts the changes.

SeongJae Park (2):
  Revert "coallocate socket_wq with socket itself"
  Revert "sockfs: switch to ->free_inode()"

 drivers/net/tap.c      |  5 +++--
 drivers/net/tun.c      |  8 +++++---
 include/linux/if_tap.h |  1 +
 include/linux/net.h    |  4 ++--
 include/net/sock.h     |  4 ++--
 net/core/sock.c        |  2 +-
 net/socket.c           | 23 ++++++++++++++++-------
 7 files changed, 30 insertions(+), 17 deletions(-)

-- 
2.17.1