CONFIG_RCU_TORTURE_TEST_SLOW_PREINIT: Slow down RCU grace-period pre-initialization to expose races

General informations

The Linux kernel configuration item CONFIG_RCU_TORTURE_TEST_SLOW_PREINIT:

• prompt: Slow down RCU grace-period pre-initialization to expose races
• type: bool
• depends on: CONFIG_RCU_TORTURE_TEST
• defined in lib/Kconfig.debug
• found in Linux kernels: 4.2–4.12

Help text

This option delays grace-period pre-initialization (the propagation of CPU-hotplug changes up the rcu_node combining tree) for a few jiffies between initializing each pair of consecutive rcu_node structures. This helps to expose races involving grace-period pre-initialization, in other words, it makes your kernel less stable. It can also greatly increase grace-period latency, especially on systems with large numbers of CPUs. This is useful when torture-testing RCU, but in almost no other circumstance.

Say Y here if you want your system to crash and hang more often. Say N if you want a sane system.

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The data is retrived from:

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• Linux Kernel Driver DataBase (LKDDb)

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