src/patches/suse-2.6.27.31/patches.suse/x86-gb-linear-map.patch

   1 From: Nick Piggin <npiggin@suse.de>
   2 Subject: Enable GB mapped linear KVA on x86
   3 References: bnc#437674
   4 Patch-upstream: should be in 2.6.28 or 29
   5
   6 GBPAGES should be turned on in SUSE x86-64 kernels.
   7
   8 Signed-off-by: Nick Piggin <npiggin@suse.de>
   9 ---
  10 ---
  11  arch/x86/Kconfig       |    9 +++++++++
  12  arch/x86/Kconfig.debug |   12 ------------
  13  2 files changed, 9 insertions(+), 12 deletions(-)
  14
  15 --- a/arch/x86/Kconfig
  16 +++ b/arch/x86/Kconfig
  17 @@ -960,6 +960,15 @@ config X86_PAE
  18           has the cost of more pagetable lookup overhead, and also
  19           consumes more pagetable space per process.
  20
  21 +config DIRECT_GBPAGES
  22 +       bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
  23 +       default y
  24 +       depends on X86_64
  25 +       help
  26 +         Allow the kernel linear mapping to use 1GB pages on CPUs that
  27 +         support it. This can improve the kernel's performance a tiny bit by
  28 +         reducing TLB pressure. If in doubt, say "Y".
  29 +
  30  # Common NUMA Features
  31  config NUMA
  32         bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
  33 --- a/arch/x86/Kconfig.debug
  34 +++ b/arch/x86/Kconfig.debug
  35 @@ -114,18 +114,6 @@ config DEBUG_RODATA
  36           data. This is recommended so that we can catch kernel bugs sooner.
  37           If in doubt, say "Y".
  38
  39 -config DIRECT_GBPAGES
  40 -       bool "Enable gbpages-mapped kernel pagetables"
  41 -       depends on DEBUG_KERNEL && EXPERIMENTAL && X86_64
  42 -       help
  43 -         Enable gigabyte pages support (if the CPU supports it). This can
  44 -         improve the kernel's performance a tiny bit by reducing TLB
  45 -         pressure.
  46 -
  47 -         This is experimental code.
  48 -
  49 -         If in doubt, say "N".
  50 -
  51  config DEBUG_RODATA_TEST
  52         bool "Testcase for the DEBUG_RODATA feature"
  53         depends on DEBUG_RODATA