CONFIG_RCU_USER_QS:

General informations

The Linux kernel configuration item CONFIG_RCU_USER_QS has multiple definitions:

found in init/Kconfig

The configuration item CONFIG_RCU_USER_QS:

• prompt:
• type: bool
• depends on: (none)
• defined in init/Kconfig
• found in Linux kernels: 4.2

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.

Consider userspace as in RCU extended quiescent state found in init/Kconfig

The configuration item CONFIG_RCU_USER_QS:

• prompt: Consider userspace as in RCU extended quiescent state
• type: bool
• depends on: CONFIG_HAVE_CONTEXT_TRACKING && CONFIG_SMP
• defined in init/Kconfig
• found in Linux kernels: 3.7–3.19, 4.0–4.1

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

LKDDb

Raw data from LKDDb:

• (none)

Sources

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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