* [patch] x86: enable GBPAGES option by default
@ 2008-10-22 10:33 Nick Piggin
2008-10-22 10:35 ` Nick Piggin
2008-10-22 11:30 ` Ingo Molnar
0 siblings, 2 replies; 3+ messages in thread
From: Nick Piggin @ 2008-10-22 10:33 UTC (permalink / raw)
To: Andrew Morton, kleen; +Cc: Linux Kernel Mailing List, Ingo Molnar
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>
---
Index: linux-2.6/arch/x86/Kconfig
===================================================================
--- linux-2.6.orig/arch/x86/Kconfig
+++ linux-2.6/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)"
Index: linux-2.6/arch/x86/Kconfig.debug
===================================================================
--- linux-2.6.orig/arch/x86/Kconfig.debug
+++ linux-2.6/arch/x86/Kconfig.debug
@@ -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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [patch] x86: enable GBPAGES option by default
2008-10-22 10:33 [patch] x86: enable GBPAGES option by default Nick Piggin
@ 2008-10-22 10:35 ` Nick Piggin
2008-10-22 11:30 ` Ingo Molnar
1 sibling, 0 replies; 3+ messages in thread
From: Nick Piggin @ 2008-10-22 10:35 UTC (permalink / raw)
To: Andrew Morton, Andi Kleen; +Cc: Linux Kernel Mailing List, Ingo Molnar
Oops, messed up Andi's email...
On Wed, Oct 22, 2008 at 12:33:16PM +0200, Nick Piggin wrote:
> 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>
> ---
> Index: linux-2.6/arch/x86/Kconfig
> ===================================================================
> --- linux-2.6.orig/arch/x86/Kconfig
> +++ linux-2.6/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)"
> Index: linux-2.6/arch/x86/Kconfig.debug
> ===================================================================
> --- linux-2.6.orig/arch/x86/Kconfig.debug
> +++ linux-2.6/arch/x86/Kconfig.debug
> @@ -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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [patch] x86: enable GBPAGES option by default
2008-10-22 10:33 [patch] x86: enable GBPAGES option by default Nick Piggin
2008-10-22 10:35 ` Nick Piggin
@ 2008-10-22 11:30 ` Ingo Molnar
1 sibling, 0 replies; 3+ messages in thread
From: Ingo Molnar @ 2008-10-22 11:30 UTC (permalink / raw)
To: Nick Piggin
Cc: Andrew Morton, kleen, Linux Kernel Mailing List, Thomas Gleixner,
H. Peter Anvin
* Nick Piggin <npiggin@suse.de> wrote:
> 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>
applied to tip/x86/mm, thanks Nick!
Ingo
^ permalink raw reply [flat|nested] 3+ messages in thread
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2008-10-22 10:33 [patch] x86: enable GBPAGES option by default Nick Piggin
2008-10-22 10:35 ` Nick Piggin
2008-10-22 11:30 ` Ingo Molnar
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