diff options
| -rw-r--r-- | include/linux/huge_mm.h | 4 | ||||
| -rw-r--r-- | mm/huge_memory.c | 22 | ||||
| -rw-r--r-- | mm/memory.c | 8 |
3 files changed, 32 insertions, 2 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index b31cb7da0346..1af477552459 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -8,6 +8,10 @@ extern int do_huge_pmd_anonymous_page(struct mm_struct *mm, extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm, pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr, struct vm_area_struct *vma); +extern void huge_pmd_set_accessed(struct mm_struct *mm, + struct vm_area_struct *vma, + unsigned long address, pmd_t *pmd, + pmd_t orig_pmd, int dirty); extern int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long address, pmd_t *pmd, pmd_t orig_pmd); diff --git a/mm/huge_memory.c b/mm/huge_memory.c index ea5fb93a53a9..5f902e20e8c0 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -784,6 +784,28 @@ out: return ret; } +void huge_pmd_set_accessed(struct mm_struct *mm, + struct vm_area_struct *vma, + unsigned long address, + pmd_t *pmd, pmd_t orig_pmd, + int dirty) +{ + pmd_t entry; + unsigned long haddr; + + spin_lock(&mm->page_table_lock); + if (unlikely(!pmd_same(*pmd, orig_pmd))) + goto unlock; + + entry = pmd_mkyoung(orig_pmd); + haddr = address & HPAGE_PMD_MASK; + if (pmdp_set_access_flags(vma, haddr, pmd, entry, dirty)) + update_mmu_cache_pmd(vma, address, pmd); + +unlock: + spin_unlock(&mm->page_table_lock); +} + static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long address, diff --git a/mm/memory.c b/mm/memory.c index 221fc9ffcab1..765377385632 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3537,8 +3537,9 @@ retry: barrier(); if (pmd_trans_huge(orig_pmd)) { - if (flags & FAULT_FLAG_WRITE && - !pmd_write(orig_pmd) && + unsigned int dirty = flags & FAULT_FLAG_WRITE; + + if (dirty && !pmd_write(orig_pmd) && !pmd_trans_splitting(orig_pmd)) { ret = do_huge_pmd_wp_page(mm, vma, address, pmd, orig_pmd); @@ -3550,6 +3551,9 @@ retry: if (unlikely(ret & VM_FAULT_OOM)) goto retry; return ret; + } else { + huge_pmd_set_accessed(mm, vma, address, pmd, + orig_pmd, dirty); } return 0; } |