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authorBecky Bruce <beckyb@kernel.crashing.org>2011-06-28 09:54:48 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-09-20 09:19:40 +1000
commit41151e77a4d96ea138cede6d84c955aa4769ce74 (patch)
tree2d997b77b9adf406a2fd30326bff688577d2e64f /arch/powerpc/Kconfig
parent7df5659eefad9b6d457ccdee016bd78bd064cfc0 (diff)
downloadlinaro-lsk-41151e77a4d96ea138cede6d84c955aa4769ce74.tar.gz
powerpc: Hugetlb for BookE
Enable hugepages on Freescale BookE processors. This allows the kernel to use huge TLB entries to map pages, which can greatly reduce the number of TLB misses and the amount of TLB thrashing experienced by applications with large memory footprints. Care should be taken when using this on FSL processors, as the number of large TLB entries supported by the core is low (16-64) on current processors. The supported set of hugepage sizes include 4m, 16m, 64m, 256m, and 1g. Page sizes larger than the max zone size are called "gigantic" pages and must be allocated on the command line (and cannot be deallocated). This is currently only fully implemented for Freescale 32-bit BookE processors, but there is some infrastructure in the code for 64-bit BooKE. Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/Kconfig')
-rw-r--r--arch/powerpc/Kconfig3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 0a3d5560c9b..62711421cd6 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -429,8 +429,7 @@ config ARCH_POPULATES_NODE_MAP
def_bool y
config SYS_SUPPORTS_HUGETLBFS
- def_bool y
- depends on PPC_BOOK3S_64
+ bool
source "mm/Kconfig"