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sparc64: Trim page tables for 8M hugepages

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For PMD aligned (8M) hugepages, we currently allocate
all four page table levels which is wasteful. We now
allocate till PMD level only which saves memory usage
from page tables.

Also, when freeing page table for 8M hugepage backed region,
make sure we don't try to access non-existent PTE level.

Orabug: 22630259

Signed-off-by: Nitin Gupta <nitin.m.gupta@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nitin Gupta
2016-07-29 00:54:21 -07:00
committed by David S. Miller
parent af1b1a9b36
commit 7bc3777ca1
6 changed files with 129 additions and 68 deletions
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12
arch/sparc/include/asm/hugetlb.h
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@@ -31,14 +31,6 @@ static inline int prepare_hugepage_range(struct file *file,
return 0;
}
static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
unsigned long addr, unsigned long end,
unsigned long floor,
unsigned long ceiling)
{
free_pgd_range(tlb, addr, end, floor, ceiling);
}
static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep)
{
@@ -82,4 +74,8 @@ static inline void arch_clear_hugepage_flags(struct page *page)
{
}
void hugetlb_free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
unsigned long end, unsigned long floor,
unsigned long ceiling);
#endif /* _ASM_SPARC64_HUGETLB_H */