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Commit0ca1634

Browse files
hnaztorvalds
authored andcommitted
thp: mincore transparent hugepage support
Handle transparent huge page pmd entries natively instead of splittingthem into subpages.Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>Reviewed-by: Rik van Riel <riel@redhat.com>Signed-off-by: Andrew Morton <akpm@linux-foundation.org>Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parentf2d6bfe commit0ca1634

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3 files changed

+35
-1
lines changed

3 files changed

+35
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lines changed

‎include/linux/huge_mm.h‎

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -19,6 +19,9 @@ extern struct page *follow_trans_huge_pmd(struct mm_struct *mm,
1919
externintzap_huge_pmd(structmmu_gather*tlb,
2020
structvm_area_struct*vma,
2121
pmd_t*pmd);
22+
externintmincore_huge_pmd(structvm_area_struct*vma,pmd_t*pmd,
23+
unsigned longaddr,unsigned longend,
24+
unsignedchar*vec);
2225

2326
enumtransparent_hugepage_flag {
2427
TRANSPARENT_HUGEPAGE_FLAG,

‎mm/huge_memory.c‎

Lines changed: 25 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -923,6 +923,31 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
923923
returnret;
924924
}
925925

926+
intmincore_huge_pmd(structvm_area_struct*vma,pmd_t*pmd,
927+
unsigned longaddr,unsigned longend,
928+
unsignedchar*vec)
929+
{
930+
intret=0;
931+
932+
spin_lock(&vma->vm_mm->page_table_lock);
933+
if (likely(pmd_trans_huge(*pmd))) {
934+
ret= !pmd_trans_splitting(*pmd);
935+
spin_unlock(&vma->vm_mm->page_table_lock);
936+
if (unlikely(!ret))
937+
wait_split_huge_page(vma->anon_vma,pmd);
938+
else {
939+
/*
940+
* All logical pages in the range are present
941+
* if backed by a huge page.
942+
*/
943+
memset(vec,1, (end-addr) >>PAGE_SHIFT);
944+
}
945+
}else
946+
spin_unlock(&vma->vm_mm->page_table_lock);
947+
948+
returnret;
949+
}
950+
926951
pmd_t*page_check_address_pmd(structpage*page,
927952
structmm_struct*mm,
928953
unsigned longaddress,

‎mm/mincore.c‎

Lines changed: 7 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -154,7 +154,13 @@ static void mincore_pmd_range(struct vm_area_struct *vma, pud_t *pud,
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pmd=pmd_offset(pud,addr);
155155
do {
156156
next=pmd_addr_end(addr,end);
157-
split_huge_page_pmd(vma->vm_mm,pmd);
157+
if (pmd_trans_huge(*pmd)) {
158+
if (mincore_huge_pmd(vma,pmd,addr,next,vec)) {
159+
vec+= (next-addr) >>PAGE_SHIFT;
160+
continue;
161+
}
162+
/* fall through */
163+
}
158164
if (pmd_none_or_clear_bad(pmd))
159165
mincore_unmapped_range(vma,addr,next,vec);
160166
else

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