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

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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>
This commit is contained in:
Steve Capper 2013-04-25 15:19:21 +01:00
parent 084bd29810
commit d03bb1455f
1 changed files with 5 additions and 0 deletions
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5
arch/arm64/Kconfig
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@ -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"