mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-12-28 00:35:01 +00:00
76aed95319
The goal is to break RTNL down into per-netns mutex. This patch adds per-netns mutex and its helper functions, rtnl_net_lock() and rtnl_net_unlock(). rtnl_net_lock() acquires the global RTNL and per-netns RTNL mutex, and rtnl_net_unlock() releases them. We will replace 800+ rtnl_lock() with rtnl_net_lock() and finally removes rtnl_lock() in rtnl_net_lock(). When we need to nest per-netns RTNL mutex, we will use __rtnl_net_lock(), and its locking order is defined by rtnl_net_lock_cmp_fn() as follows: 1. init_net is first 2. netns address ascending order Note that the conversion will be done under CONFIG_DEBUG_NET_SMALL_RTNL with LOCKDEP so that we can carefully add the extra mutex without slowing down RTNL operations during conversion. Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
42 lines
1.3 KiB
Plaintext
42 lines
1.3 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
|
|
|
|
config NET_DEV_REFCNT_TRACKER
|
|
bool "Enable net device refcount tracking"
|
|
depends on DEBUG_KERNEL && STACKTRACE_SUPPORT && NET
|
|
select REF_TRACKER
|
|
default n
|
|
help
|
|
Enable debugging feature to track device references.
|
|
This adds memory and cpu costs.
|
|
|
|
config NET_NS_REFCNT_TRACKER
|
|
bool "Enable networking namespace refcount tracking"
|
|
depends on DEBUG_KERNEL && STACKTRACE_SUPPORT && NET
|
|
select REF_TRACKER
|
|
default n
|
|
help
|
|
Enable debugging feature to track netns references.
|
|
This adds memory and cpu costs.
|
|
|
|
config DEBUG_NET
|
|
bool "Add generic networking debug"
|
|
depends on DEBUG_KERNEL && NET
|
|
help
|
|
Enable extra sanity checks in networking.
|
|
This is mostly used by fuzzers, but is safe to select.
|
|
|
|
config DEBUG_NET_SMALL_RTNL
|
|
bool "Add extra per-netns mutex inside RTNL"
|
|
depends on DEBUG_KERNEL && NET && LOCK_DEBUGGING_SUPPORT
|
|
select PROVE_LOCKING
|
|
default n
|
|
help
|
|
rtnl_lock() is being replaced with rtnl_net_lock() that
|
|
acquires the global RTNL and a small per-netns RTNL mutex.
|
|
|
|
During the conversion, rtnl_net_lock() just adds an extra
|
|
mutex in every RTNL scope and slows down the operations.
|
|
|
|
Once the conversion completes, rtnl_lock() will be removed
|
|
and rtnetlink will gain per-netns scalability.
|