[PATCHv2 15/28] thp: handle file COW faults
From: Kirill A. Shutemov <hidden>
Date: 2016-02-11 14:23:05
Also in:
lkml
Subsystem:
memory management, memory management - core, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
File COW for THP is handled on pte level: just split the pmd. Signed-off-by: Kirill A. Shutemov <redacted> --- mm/memory.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/mm/memory.c b/mm/memory.c
index 6c98ed8e3c4a..19eff2164e5b 100644
--- a/mm/memory.c
+++ b/mm/memory.c@@ -3334,6 +3334,11 @@ static int wp_huge_pmd(struct fault_env *fe, pmd_t orig_pmd) if (fe->vma->vm_ops->pmd_fault) return fe->vma->vm_ops->pmd_fault(fe->vma, fe->address, fe->pmd, fe->flags); + + /* COW handled on pte level: split pmd */ + VM_BUG_ON_VMA(fe->vma->vm_flags & VM_SHARED, fe->vma); + split_huge_pmd(fe->vma, fe->pmd, fe->address); + return VM_FAULT_FALLBACK; }
--
2.7.0
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