x86, mm: enable GBPAGES option by default

DIRECT_GBPAGES was under DEBUG_KERNEL && EXPERIMENTAL and disabled by default.
Turn it on by default and put it under EMBEDDED.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5b9b12321ad1..c00aefcb47d5 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -946,6 +946,15 @@ config X86_PAE
 config ARCH_PHYS_ADDR_T_64BIT
        def_bool X86_64 || X86_PAE
 
+config DIRECT_GBPAGES
+        bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
+        default y
+        depends on X86_64
+        help
+          Allow the kernel linear mapping to use 1GB pages on CPUs that
+          support it. This can improve the kernel's performance a tiny bit by
+          reducing TLB pressure. If in doubt, say "Y".
+
 # Common NUMA Features
 config NUMA
         bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"