Re: [PATCH v7 02/12] mm: x86: add CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG
From: Yu Zhao <hidden>
Date: 2022-02-08 08:27:12
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On Tue, Feb 08, 2022 at 01:18:52AM -0700, Yu Zhao wrote:
Some architectures support the accessed bit in non-leaf PMD entries, e.g., x86 sets the accessed bit in a non-leaf PMD entry when using it as part of linear address translation [1]. Page table walkers that clear the accessed bit may use this capability to reduce their search space. Note that: 1. Although an inline function is preferable, this capability is added as a configuration option for the consistency with the existing macros. 2. Due to the little interest in other varieties, this capability was only tested on Intel and AMD CPUs.
Clarified ARCH_HAS_NONLEAF_PMD_YOUNG for x86 as requested here: https://lore.kernel.org/linux-mm/CAHk-=wgvOqj6LUhNp8V5ddT8eZyYdFDzMZE73KgPggOnc28VWg@mail.gmail.com/ (local) <snipped>
quoted hunk ↗ jump to hunk
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 9f5bd41bf660..e787b7fc75be 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig@@ -85,6 +85,7 @@ config X86 select ARCH_HAS_PMEM_API if X86_64 select ARCH_HAS_PTE_DEVMAP if X86_64 select ARCH_HAS_PTE_SPECIAL + select ARCH_HAS_NONLEAF_PMD_YOUNG
And enabled it for both 32-bit and 64-bit. <snipped> _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel