CONFIG_DEBUG_NET_SMALL_RTNL: Add extra per-netns mutex inside RTNL

General informations

The Linux kernel configuration item CONFIG_DEBUG_NET_SMALL_RTNL:

• prompt: Add extra per-netns mutex inside RTNL
• type: bool
• depends on: CONFIG_DEBUG_KERNEL && CONFIG_NET && CONFIG_LOCK_DEBUGGING_SUPPORT
• defined in net/Kconfig.debug
• found in Linux kernels: 6.13-rc+HEAD

Help text

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.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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