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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/include/asm/mmu.h
parent7df5659eefad9b6d457ccdee016bd78bd064cfc0 (diff)
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/include/asm/mmu.h')
-rw-r--r--arch/powerpc/include/asm/mmu.h18
1 files changed, 10 insertions, 8 deletions
diff --git a/arch/powerpc/include/asm/mmu.h b/arch/powerpc/include/asm/mmu.h
index 698b3063868..f0145522cfb 100644
--- a/arch/powerpc/include/asm/mmu.h
+++ b/arch/powerpc/include/asm/mmu.h
@@ -175,14 +175,16 @@ extern u64 ppc64_rma_size;
#define MMU_PAGE_64K_AP 3 /* "Admixed pages" (hash64 only) */
#define MMU_PAGE_256K 4
#define MMU_PAGE_1M 5
-#define MMU_PAGE_8M 6
-#define MMU_PAGE_16M 7
-#define MMU_PAGE_256M 8
-#define MMU_PAGE_1G 9
-#define MMU_PAGE_16G 10
-#define MMU_PAGE_64G 11
-#define MMU_PAGE_COUNT 12
-
+#define MMU_PAGE_4M 6
+#define MMU_PAGE_8M 7
+#define MMU_PAGE_16M 8
+#define MMU_PAGE_64M 9
+#define MMU_PAGE_256M 10
+#define MMU_PAGE_1G 11
+#define MMU_PAGE_16G 12
+#define MMU_PAGE_64G 13
+
+#define MMU_PAGE_COUNT 14
#if defined(CONFIG_PPC_STD_MMU_64)
/* 64-bit classic hash table MMU */