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authorIngo Molnar <mingo@elte.hu>2008-04-17 17:40:45 +0200
committerIngo Molnar <mingo@elte.hu>2008-04-17 17:40:45 +0200
commit00d1c5e05736f947687be27706bda01cec104e57 (patch)
treeb5690b58de35efa2f928d1daaf24b21650ebc8a0 /arch/x86/Kconfig.debug
parentfe770bf0310d90b3b033c19044d45b7de5f2041c (diff)
x86: add gbpages switches
These new controls toggle experimental support for a new CPU feature, the straightforward extension of largepages from the pmd level to the pud level, which allows 1GB (kernel) TLBs instead of 2MB TLBs. Turn it off by default, as this code has not been tested well enough yet. Use the CONFIG_DIRECT_GBPAGES=y .config option or gbpages on the boot line can be used to enable it. If enabled in the .config then nogbpages boot option disables it. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/Kconfig.debug')
-rw-r--r--arch/x86/Kconfig.debug12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 7ce8e702566..f4413c04e68 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -76,6 +76,18 @@ 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