CONFIG_RCU_CPU_STALL_CPUTIME: Provide additional RCU stall debug information

General informations

The Linux kernel configuration item CONFIG_RCU_CPU_STALL_CPUTIME:

• prompt: Provide additional RCU stall debug information
• type: bool
• depends on: CONFIG_RCU_STALL_COMMON
• defined in kernel/rcu/Kconfig.debug
• found in Linux kernels: 6.3–6.8, 6.9-rc+HEAD

Help text

Collect statistics during the sampling period, such as the number of (hard interrupts, soft interrupts, task switches) and the cputime of (hard interrupts, soft interrupts, kernel tasks) are added to the RCU stall report. For multiple continuous RCU stalls, all sampling periods begin at half of the first RCU stall timeout. The boot option rcupdate.rcu_cpu_stall_cputime has the same function as this one, but will override this if it exists.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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