CONFIG_KVM_BOOK3S_HV_P8_TIMING: Detailed timing for hypervisor real-mode code (for POWER8)

General informations

The Linux kernel configuration item CONFIG_KVM_BOOK3S_HV_P8_TIMING:

• prompt: Detailed timing for hypervisor real-mode code (for POWER8)
• type: bool
• depends on: CONFIG_KVM_BOOK3S_HV_POSSIBLE && CONFIG_DEBUG_FS && ! CONFIG_KVM_BOOK3S_HV_P9_TIMING
• defined in arch/powerpc/kvm/Kconfig
• found in Linux kernels: 6.0–6.12, 6.13-rc+HEAD

Help text

Calculate time taken for each vcpu in the real-mode guest entry, exit, and interrupt handling code, plus time spent in the guest and in nap mode due to idle (cede) while other threads are still in the guest. The total, minimum and maximum times in nanoseconds together with the number of executions are reported in debugfs in kvm/vm#/vcpu#/timings. The overhead is of the order of 30 - 40 ns per exit on POWER8.

If unsure, say N.

Hardware

LKDDb

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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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