diff options
Diffstat (limited to 'fs/proc/task_mmu.c')
| -rw-r--r-- | fs/proc/task_mmu.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index bc651644b1b2..67c76468a7be 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -949,6 +949,7 @@ struct pagemapread { #define PM_PFRAME_BITS 55 #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0) #define PM_SOFT_DIRTY BIT_ULL(55) +#define PM_MMAP_EXCLUSIVE BIT_ULL(56) #define PM_FILE BIT_ULL(61) #define PM_SWAP BIT_ULL(62) #define PM_PRESENT BIT_ULL(63) @@ -1036,6 +1037,8 @@ static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm, if (page && !PageAnon(page)) flags |= PM_FILE; + if (page && page_mapcount(page) == 1) + flags |= PM_MMAP_EXCLUSIVE; if (vma->vm_flags & VM_SOFTDIRTY) flags |= PM_SOFT_DIRTY; @@ -1066,6 +1069,11 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end, * This if-check is just to prepare for future implementation. */ if (pmd_present(pmd)) { + struct page *page = pmd_page(pmd); + + if (page_mapcount(page) == 1) + flags |= PM_MMAP_EXCLUSIVE; + flags |= PM_PRESENT; if (pm->show_pfn) frame = pmd_pfn(pmd) + @@ -1131,6 +1139,9 @@ static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask, if (!PageAnon(page)) flags |= PM_FILE; + if (page_mapcount(page) == 1) + flags |= PM_MMAP_EXCLUSIVE; + flags |= PM_PRESENT; if (pm->show_pfn) frame = pte_pfn(pte) + @@ -1163,7 +1174,8 @@ static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask, * Bits 0-4 swap type if swapped * Bits 5-54 swap offset if swapped * Bit 55 pte is soft-dirty (see Documentation/vm/soft-dirty.txt) - * Bits 56-60 zero + * Bit 56 page exclusively mapped + * Bits 57-60 zero * Bit 61 page is file-page or shared-anon * Bit 62 page swapped * Bit 63 page present |