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

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The Linux kernel configuration item CONFIG_DEBUG_WQ_FORCE_RR_CPU:

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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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