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CONFIG_RCU_USER_QS: Consider userspace as in RCU extended quiescent state

General informations

The Linux kernel configuration item CONFIG_RCU_USER_QS:

Help text

This option sets hooks on kernel / userspace boundaries and puts RCU in extended quiescent state when the CPU runs in userspace. It means that when a CPU runs in userspace, it is excluded from the global RCU state machine and thus doesn't try to keep the timer tick on for RCU.

Unless you want to hack and help the development of the full dynticks mode, you shouldn't enable this option. It also adds unnecessary overhead.

If unsure say N

Hardware

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