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Commit 9e899816 authored by Nick Piggin's avatar Nick Piggin Committed by Ingo Molnar
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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: default avatarNick Piggin <npiggin@suse.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 2515ddc6

arch/x86/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -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)"

arch/x86/Kconfig.debug

+0 −12
Original line number Diff line number Diff line
@@ -114,18 +114,6 @@ config DEBUG_RODATA 
	  data. This is recommended so that we can catch kernel bugs sooner.

	  If in doubt, say "Y".



config DIRECT_GBPAGES

	bool "Enable gbpages-mapped kernel pagetables"

	depends on DEBUG_KERNEL && EXPERIMENTAL && X86_64

	help

	  Enable gigabyte pages support (if the CPU supports it). This can

	  improve the kernel's performance a tiny bit by reducing TLB

	  pressure.



	  This is experimental code.



	  If in doubt, say "N".



config DEBUG_RODATA_TEST

	bool "Testcase for the DEBUG_RODATA feature"

	depends on DEBUG_RODATA