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powerpc: Hugetlb for BookE

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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>
This commit is contained in:
Becky Bruce
2011-06-28 09:54:48 +00:00
committed by Benjamin Herrenschmidt
parent 7df5659eef
commit 41151e77a4
20 changed files with 765 additions and 105 deletions
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16
arch/powerpc/include/asm/mmu.h
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@ -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 */