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 <[email protected]> Acked-by: Catalin Marinas <[email protected]>
zubinmehta · Jun 14, 2013 · d03bb14 · d03bb14
1 parent 084bd29
commit d03bb14
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
@@ -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"