Messages in this thread Patch in this message | | | From | "Wang, Yalin" <> | Date | Fri, 30 Jan 2015 15:47:54 +0800 | Subject | [RFC V2] mm:change smaps/pagemap_read calculation behavior |
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This patch change smaps/pagemap_read pagetable walk behavior, to make sure not skip VM_PFNMAP pagetables, so that we can calculate COW pages of VM_PFNMAP as normal pages.
Signed-off-by: Yalin Wang <yalin.wang@sonymobile.com> --- fs/proc/task_mmu.c | 2 ++ include/linux/mm.h | 2 ++ mm/pagewalk.c | 5 +++++ 3 files changed, 9 insertions(+)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index c7267e9..e7d7c43 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -616,6 +616,7 @@ static int show_smap(struct seq_file *m, void *v, int is_pid) struct mem_size_stats mss; struct mm_walk smaps_walk = { .pmd_entry = smaps_pte_range, + .test_walk = generic_walk_page_test_no_skip, .mm = vma->vm_mm, .private = &mss, }; @@ -1264,6 +1265,7 @@ static ssize_t pagemap_read(struct file *file, char __user *buf, pagemap_walk.pmd_entry = pagemap_pte_range; pagemap_walk.pte_hole = pagemap_pte_hole; + pagemap_walk.test_walk = generic_walk_page_test_no_skip; #ifdef CONFIG_HUGETLB_PAGE pagemap_walk.hugetlb_entry = pagemap_hugetlb_range; #endif diff --git a/include/linux/mm.h b/include/linux/mm.h index b976d9f..07f71c5 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1191,6 +1191,8 @@ struct mm_walk { void *private; }; +int generic_walk_page_test_no_skip(unsigned long start, unsigned long end, + struct mm_walk *walk); int walk_page_range(unsigned long addr, unsigned long end, struct mm_walk *walk); int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk); diff --git a/mm/pagewalk.c b/mm/pagewalk.c index 75c1f28..14f38d5 100644 --- a/mm/pagewalk.c +++ b/mm/pagewalk.c @@ -206,6 +206,11 @@ static int __walk_page_range(unsigned long start, unsigned long end, return err; } +int generic_walk_page_test_no_skip(unsigned long start, unsigned long end, + struct mm_walk *walk) +{ + return 0; +} /** * walk_page_range - walk page table with caller specific callbacks * -- 2.2.2
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