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CONFIG_ARM64_HW_AFDBM: Support for hardware updates of the Access and Dirty page flags

General informations

The Linux kernel configuration item CONFIG_ARM64_HW_AFDBM:

Help text

The ARMv8.1 architecture extensions introduce support for hardware updates of the access and dirty information in page table entries. When enabled in TCR_EL1 (HA and HD bits) on capable processors, accesses to pages with PTE_AF cleared will set this bit instead of raising an access flag fault. Similarly, writes to read-only pages with the DBM bit set will clear the read-only bit (AP[2]) instead of raising a permission fault.

Kernels built with this configuration option enabled continue to work on pre-ARMv8.1 hardware and the performance impact is minimal. If unsure, say Y.



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