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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2016-04-29 13:26:23 (GMT) |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-05-11 11:53:54 (GMT) |
| commit | 5ed7ecd08a0807d6d616c3d958402f9c723bb048 (patch) | |
| tree | 416bd1a8321d42861a301e10eecd0f37902fd1d6 /arch/powerpc/mm | |
| parent | a3dece6d69b0ad21b64104dff508c67a1a1f14dd (diff) | |
| download | linux-5ed7ecd08a0807d6d616c3d958402f9c723bb048.tar.xz | |
powerpc/mm: pte_frag abstraction
In this patch we make the number of pte fragments per level 4 page table
page a variable. Radix level 4 table size is 256 bytes and hence we can
have 256 fragments per level 4 page. We don't update the fragment count
in this patch. We need to do performance measurements to find the right
value for fragment count.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/hash_utils_64.c | 3 | ||||
| -rw-r--r-- | arch/powerpc/mm/pgtable-radix.c | 5 | ||||
| -rw-r--r-- | arch/powerpc/mm/pgtable_64.c | 4 |
3 files changed, 12 insertions, 0 deletions
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index 68aee43..262082e 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -873,6 +873,9 @@ void __init hash__early_init_mmu(void) /* * initialize page table size */ + __pte_frag_nr = H_PTE_FRAG_NR; + __pte_frag_size_shift = H_PTE_FRAG_SIZE_SHIFT; + __pte_index_size = H_PTE_INDEX_SIZE; __pmd_index_size = H_PMD_INDEX_SIZE; __pud_index_size = H_PUD_INDEX_SIZE; diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c index 13afacd..a5a5253 100644 --- a/arch/powerpc/mm/pgtable-radix.c +++ b/arch/powerpc/mm/pgtable-radix.c @@ -334,6 +334,11 @@ void __init radix__early_init_mmu(void) __vmalloc_end = RADIX_VMALLOC_END; vmemmap = (struct page *)RADIX_VMEMMAP_BASE; ioremap_bot = IOREMAP_BASE; + /* + * For now radix also use the same frag size + */ + __pte_frag_nr = H_PTE_FRAG_NR; + __pte_frag_size_shift = H_PTE_FRAG_SIZE_SHIFT; radix_init_page_sizes(); if (!firmware_has_feature(FW_FEATURE_LPAR)) diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c index 216e2bd..95df08e 100644 --- a/arch/powerpc/mm/pgtable_64.c +++ b/arch/powerpc/mm/pgtable_64.c @@ -107,6 +107,10 @@ unsigned long __vmalloc_end; EXPORT_SYMBOL(__vmalloc_end); struct page *vmemmap; EXPORT_SYMBOL(vmemmap); +unsigned long __pte_frag_nr; +EXPORT_SYMBOL(__pte_frag_nr); +unsigned long __pte_frag_size_shift; +EXPORT_SYMBOL(__pte_frag_size_shift); unsigned long ioremap_bot; #else /* !CONFIG_PPC_BOOK3S_64 */ unsigned long ioremap_bot = IOREMAP_BASE; |