CONFIG_TASKS_TRACE_RCU_READ_MB: Tasks Trace RCU readers use memory barriers in user and idle

General informations

The Linux kernel configuration item CONFIG_TASKS_TRACE_RCU_READ_MB:

• prompt: Tasks Trace RCU readers use memory barriers in user and idle
• type: bool
• depends on: CONFIG_RCU_EXPERT && CONFIG_TASKS_TRACE_RCU
• defined in kernel/rcu/Kconfig
• found in Linux kernels: 5.8–5.19, 6.0–6.12, 6.13-rc+HEAD

Help text

Use this option to further reduce the number of IPIs sent to CPUs executing in userspace or idle during tasks trace RCU grace periods. Given that a reasonable setting of the rcupdate.rcu_task_ipi_delay kernel boot parameter eliminates such IPIs for many workloads, proper setting of this Kconfig option is important mostly for aggressive real-time installations and for battery-powered devices, hence the default chosen above.

Say Y here if you hate IPIs. Say N here if you hate read-side memory barriers. Take the default if you are unsure.

Hardware

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This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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