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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 /Documentation
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 'Documentation')
-rw-r--r--Documentation/x86_64/boot-options.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt
index 34abae4e944..b0c7b6c4abd 100644
--- a/Documentation/x86_64/boot-options.txt
+++ b/Documentation/x86_64/boot-options.txt
@@ -307,3 +307,8 @@ Debugging
stuck (default)
Miscellaneous
+
+ nogbpages
+ Do not use GB pages for kernel direct mappings.
+ gbpages
+ Use GB pages for kernel direct mappings.