1 files changed, 13 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index a8ba119a4d53..6afd091bc1f8 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -307,6 +307,19 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                         behaviour to be specified.  Bit 0 enables warnings,
                         bit 1 enables fixups, and bit 2 sends a segfault.
 
+        align_va_addr=  [X86-64]
+                        Align virtual addresses by clearing slice [14:12] when
+                        allocating a VMA at process creation time. This option
+                        gives you up to 3% performance improvement on AMD F15h
+                        machines (where it is enabled by default) for a
+                        CPU-intensive style benchmark, and it can vary highly in
+                        a microbenchmark depending on workload and compiler.
+
+                        1: only for 32-bit processes
+                        2: only for 64-bit processes
+                        on: enable for both 32- and 64-bit processes
+                        off: disable for both 32- and 64-bit processes
+
         amd_iommu=      [HW,X86-84]
                         Pass parameters to the AMD IOMMU driver in the system.
                         Possible values are: