CONFIG_DEBUG_WQ_FORCE_RR_CPU: Force round-robin CPU selection for unbound work items

General informations

The Linux kernel configuration item CONFIG_DEBUG_WQ_FORCE_RR_CPU:

• prompt: Force round-robin CPU selection for unbound work items
• type: bool
• depends on: CONFIG_DEBUG_KERNEL
• defined in lib/Kconfig.debug
• found in Linux kernels: 4.5–4.20, 5.0–5.19, 6.0–6.13, 6.14-rc+HEAD

Help text

Workqueue used to implicitly guarantee that work items queued without explicit CPU specified are put on the local CPU. This guarantee is no longer true and while local CPU is still preferred work items may be put on foreign CPUs. Kernel parameter "workqueue.debug_force_rr_cpu" is added to force round-robin CPU selection to flush out usages which depend on the now broken guarantee. This config option enables the debug feature by default. When enabled, memory and cache locality will be impacted.

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The data is retrived from:

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• Linux Kernel Driver DataBase (LKDDb)

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