Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / mm / Kconfig

diff --git a/mm/Kconfig b/mm/Kconfig
index c2c8a4a11898f949faa72cf5702d8c21e64f78b9..e9c0c61f2ddd0881bbb9dee37d3384dae0146ece 100644 (file)
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -179,7 +179,7 @@ config SPLIT_PTLOCK_CPUS
 config COMPACTION
        bool "Allow for memory compaction"
        select MIGRATION
-       depends on EXPERIMENTAL && HUGETLB_PAGE && MMU
+       depends on MMU
        help
          Allows the compaction of memory for the allocation of huge pages.
 
@@ -302,6 +302,44 @@ config NOMMU_INITIAL_TRIM_EXCESS
 
          See Documentation/nommu-mmap.txt for more information.
 
+config TRANSPARENT_HUGEPAGE
+       bool "Transparent Hugepage Support"
+       depends on X86 && MMU
+       select COMPACTION
+       help
+         Transparent Hugepages allows the kernel to use huge pages and
+         huge tlb transparently to the applications whenever possible.
+         This feature can improve computing performance to certain
+         applications by speeding up page faults during memory
+         allocation, by reducing the number of tlb misses and by speeding
+         up the pagetable walking.
+
+         If memory constrained on embedded, you may want to say N.
+
+choice
+       prompt "Transparent Hugepage Support sysfs defaults"
+       depends on TRANSPARENT_HUGEPAGE
+       default TRANSPARENT_HUGEPAGE_ALWAYS
+       help
+         Selects the sysfs defaults for Transparent Hugepage Support.
+
+       config TRANSPARENT_HUGEPAGE_ALWAYS
+               bool "always"
+       help
+         Enabling Transparent Hugepage always, can increase the
+         memory footprint of applications without a guaranteed
+         benefit but it will work automatically for all applications.
+
+       config TRANSPARENT_HUGEPAGE_MADVISE
+               bool "madvise"
+       help
+         Enabling Transparent Hugepage madvise, will only provide a
+         performance improvement benefit to the applications using
+         madvise(MADV_HUGEPAGE) but it won't risk to increase the
+         memory footprint of applications without a guaranteed
+         benefit.
+endchoice
+
 #
 # UP and nommu archs use km based percpu allocator
 #