Commit d03bb145 authored Apr 25, 2013 by Steve Capper

ARM64: mm: Raise MAX_ORDER for 64KB pages and THP.



The buddy allocator has a default MAX_ORDER of 11, which is too
low to allocate enough memory for 512MB Transparent HugePages if
our base page size is 64KB.

This patch introduces MAX_ZONE_ORDER and sets it to 14 when 64KB
pages are used in conjuction with THP, otherwise the default value
of 11 is used.

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>

parent 084bd298

arch/arm64/Kconfig

+5 −0

Original line number	Diff line number	Diff line
		@@ -191,6 +191,11 @@ config ARCH_WANT_HUGE_PMD_SHARE

		source "mm/Kconfig"

		config FORCE_MAX_ZONEORDER
		int
		default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
		default "11"

		endmenu

		menu "Boot options"

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