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SubjectRe: [PATCH v3 07/13] numa_maps: remove numa_maps->vma
On Fri, Jun 20, 2014 at 04:11:33PM -0400, Naoya Horiguchi wrote:
> pagewalk.c can handle vma in itself, so we don't have to pass vma via
> walk->private. And show_numa_map() walks pages on vma basis, so using
> walk_page_vma() is preferable.
>
> Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
> ---
> fs/proc/task_mmu.c | 18 ++++++++----------
> 1 file changed, 8 insertions(+), 10 deletions(-)
>
> diff --git v3.16-rc1.orig/fs/proc/task_mmu.c v3.16-rc1/fs/proc/task_mmu.c
> index 74f87794afab..b4459c006d50 100644
> --- v3.16-rc1.orig/fs/proc/task_mmu.c
> +++ v3.16-rc1/fs/proc/task_mmu.c
> @@ -1247,7 +1247,6 @@ const struct file_operations proc_pagemap_operations = {
> #ifdef CONFIG_NUMA
>
> struct numa_maps {
> - struct vm_area_struct *vma;
> unsigned long pages;
> unsigned long anon;
> unsigned long active;
> @@ -1316,18 +1315,17 @@ static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma,
> static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
> unsigned long end, struct mm_walk *walk)
> {
> - struct numa_maps *md;
> + struct numa_maps *md = walk->private;
> + struct vm_area_struct *vma = walk->vma;
> spinlock_t *ptl;
> pte_t *orig_pte;
> pte_t *pte;
>
> - md = walk->private;
> -
> - if (pmd_trans_huge_lock(pmd, md->vma, &ptl) == 1) {
> + if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
> pte_t huge_pte = *(pte_t *)pmd;
> struct page *page;
>
> - page = can_gather_numa_stats(huge_pte, md->vma, addr);
> + page = can_gather_numa_stats(huge_pte, vma, addr);
> if (page)
> gather_stats(page, md, pte_dirty(huge_pte),
> HPAGE_PMD_SIZE/PAGE_SIZE);
> @@ -1339,7 +1337,7 @@ static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
> return 0;
> orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
> do {
> - struct page *page = can_gather_numa_stats(*pte, md->vma, addr);
> + struct page *page = can_gather_numa_stats(*pte, vma, addr);
> if (!page)
> continue;
> gather_stats(page, md, pte_dirty(*pte), 1);
> @@ -1398,12 +1396,11 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid)
> /* Ensure we start with an empty set of numa_maps statistics. */
> memset(md, 0, sizeof(*md));
>
> - md->vma = vma;
> -
> walk.hugetlb_entry = gather_hugetbl_stats;
> walk.pmd_entry = gather_pte_stats;
> walk.private = md;
> walk.mm = mm;
> + walk.vma = vma;

Redundant.

And it's probably good idea move walk initialization to declaration.

Otherwise:

Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>

>
> pol = get_vma_policy(task, vma, vma->vm_start);
> mpol_to_str(buffer, sizeof(buffer), pol);
> @@ -1434,7 +1431,8 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid)
> if (is_vm_hugetlb_page(vma))
> seq_puts(m, " huge");
>
> - walk_page_range(vma->vm_start, vma->vm_end, &walk);
> + /* mmap_sem is held by m_start */
> + walk_page_vma(vma, &walk);
>
> if (!md->pages)
> goto out;
> --
> 1.9.3
>
> --
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--
Kirill A. Shutemov


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