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CONFIG_VIRT_CPU_ACCOUNTING: Deterministic task and CPU time accounting

General informations

The Linux kernel configuration item CONFIG_VIRT_CPU_ACCOUNTING has multiple definitions:

found in arch/s390/Kconfig

The configuration item CONFIG_VIRT_CPU_ACCOUNTING:

Help text

(none)

found in init/Kconfig

The configuration item CONFIG_VIRT_CPU_ACCOUNTING:

Help text

(none)

Base user process accounting on virtual cpu timer found in arch/s390/Kconfig

The configuration item CONFIG_VIRT_CPU_ACCOUNTING:

Help text

Select this option to use CPU timer deltas to do user process accounting.

Deterministic task and CPU time accounting found in arch/ia64/Kconfig

The configuration item CONFIG_VIRT_CPU_ACCOUNTING:

Help text

Select this option to enable more accurate task and CPU time accounting. This is done by reading a CPU counter on each kernel entry and exit and on transitions within the kernel between system, softirq and hardirq state, so there is a small performance impact. If in doubt, say N here.

Deterministic task and CPU time accounting found in arch/powerpc/Kconfig

The configuration item CONFIG_VIRT_CPU_ACCOUNTING:

Help text

Select this option to enable more accurate task and CPU time accounting. This is done by reading a CPU counter on each kernel entry and exit and on transitions within the kernel between system, softirq and hardirq state, so there is a small performance impact. This also enables accounting of stolen time on logically-partitioned systems running on IBM POWER5-based machines.

If in doubt, say Y here.

Deterministic task and CPU time accounting found in arch/powerpc/platforms/Kconfig.cputype

The configuration item CONFIG_VIRT_CPU_ACCOUNTING:

Help text

Select this option to enable more accurate task and CPU time accounting. This is done by reading a CPU counter on each kernel entry and exit and on transitions within the kernel between system, softirq and hardirq state, so there is a small performance impact. This also enables accounting of stolen time on logically-partitioned systems running on IBM POWER5-based machines.

If in doubt, say Y here.

Deterministic task and CPU time accounting found in init/Kconfig

The configuration item CONFIG_VIRT_CPU_ACCOUNTING:

Help text

Select this option to enable more accurate task and CPU time accounting. This is done by reading a CPU counter on each kernel entry and exit and on transitions within the kernel between system, softirq and hardirq state, so there is a small performance impact. In the case of s390 or IBM POWER > 5, this also enables accounting of stolen time on logically-partitioned systems.

Hardware

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