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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142# 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.