CONFIG_ORC_UNWINDER: ORC unwinder

General informations

The Linux kernel configuration item CONFIG_ORC_UNWINDER:

• prompt: ORC unwinder
• type: bool
• depends on: CONFIG_X86_64
• defined in arch/x86/Kconfig.debug
• found in Linux kernels: 4.14

Help text

This option enables the ORC (Oops Rewind Capability) unwinder for unwinding kernel stack traces. It uses a custom data format which is a simplified version of the DWARF Call Frame Information standard.

This unwinder is more accurate across interrupt entry frames than the frame pointer unwinder. It also enables a 5-10% performance improvement across the entire kernel compared to frame pointers.

Enabling this option will increase the kernel's runtime memory usage by roughly 2-4MB, depending on your kernel config.

Hardware

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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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