arm64: mm: Implement arch_wants_old_prefaulted_pte()

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On CPUs with hardware AF/DBM, initialising prefaulted PTEs as 'old'
improves vmscan behaviour and does not appear to introduce any overhead
elsewhere.

Implement arch_wants_old_prefaulted_pte() to return 'true' if we detect
hardware access flag support at runtime. This can be extended in future
based on MIDR matching if necessary.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>

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Will Deacon 2020-11-24 18:49:26 +00:00

parent 46bdb4277f

commit 0388f9c743

1 changed files with 11 additions and 1 deletions

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arch/arm64/include/asm/pgtable.h

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