On Mon, Jun 26, 2023 at 11:15 AM Ryan Roberts <ryan.roberts@xxxxxxx> wrote: > > For the unhinted case, when THP is not permitted for the vma, don't > allow anything bigger than 64K. This means we don't waste too much > memory. Additionally, for 4K pages this is the contpte size, and for > 16K, this is (usually) the HPA size when the uarch feature is > implemented. For the hinted case, when THP is permitted for the vma, > allow the contpte size for all page size configurations; 64K for 4K, 2M > for 16K and 2M for 64K. > > Signed-off-by: Ryan Roberts <ryan.roberts@xxxxxxx> > --- > arch/arm64/Kconfig | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 343e1e1cae10..0e91b5bc8cd9 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -243,6 +243,7 @@ config ARM64 > select TRACE_IRQFLAGS_SUPPORT > select TRACE_IRQFLAGS_NMI_SUPPORT > select HAVE_SOFTIRQ_ON_OWN_STACK > + select ARCH_SUPPORTS_LARGE_ANON_FOLIO > help > ARM 64-bit (AArch64) Linux support. > > @@ -281,6 +282,18 @@ config ARM64_CONT_PMD_SHIFT > default 5 if ARM64_16K_PAGES > default 4 > > +config ARCH_LARGE_ANON_FOLIO_NOTHP_ORDER_MAX > + int > + default 0 if ARM64_64K_PAGES # 64K (1 page) > + default 2 if ARM64_16K_PAGES # 64K (4 pages; benefits from HPA where HW supports it) > + default 4 if ARM64_4K_PAGES # 64K (16 pages; eligible for contpte-mapping) > + > +config ARCH_LARGE_ANON_FOLIO_THP_ORDER_MAX > + int > + default 5 if ARM64_64K_PAGES # 2M (32 page; eligible for contpte-mapping) > + default 7 if ARM64_16K_PAGES # 2M (128 pages; eligible for contpte-mapping) > + default 4 if ARM64_4K_PAGES # 64K (16 pages; eligible for contpte-mapping) > + > config ARCH_MMAP_RND_BITS_MIN > default 14 if ARM64_64K_PAGES > default 16 if ARM64_16K_PAGES Can we please just add one Kconfig for the large anon folio feature, i.e., ARCH_WANTS_PTE_ORDER, for now? Feel free to add as many as you wish for arm specific features like HPA and contpte.
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