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Subject[PATCH v4 08/13] numa_maps: remove numa_maps->vma
Date
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.

ChangeLog v4:
- remove redundant vma

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
fs/proc/task_mmu.c | 29 +++++++++++++----------------
1 file changed, 13 insertions(+), 16 deletions(-)

diff --git v3.16-rc3.orig/fs/proc/task_mmu.c v3.16-rc3/fs/proc/task_mmu.c
index 0d3d1ac32b2e..4ca28f401bb1 100644
--- v3.16-rc3.orig/fs/proc/task_mmu.c
+++ v3.16-rc3/fs/proc/task_mmu.c
@@ -1245,7 +1245,6 @@ 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;
@@ -1314,18 +1313,17 @@ 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);
@@ -1337,7 +1335,7 @@ 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);
@@ -1385,7 +1383,12 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid)
struct file *file = vma->vm_file;
struct task_struct *task = proc_priv->task;
struct mm_struct *mm = vma->vm_mm;
- struct mm_walk walk = {};
+ struct mm_walk walk = {
+ .hugetlb_entry = gather_hugetlb_stats,
+ .pmd_entry = gather_pte_stats,
+ .private = md,
+ .mm = mm,
+ };
struct mempolicy *pol;
char buffer[64];
int nid;
@@ -1396,13 +1399,6 @@ 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_hugetlb_stats;
- walk.pmd_entry = gather_pte_stats;
- walk.private = md;
- walk.mm = mm;
-
pol = get_vma_policy(task, vma, vma->vm_start);
mpol_to_str(buffer, sizeof(buffer), pol);
mpol_cond_put(pol);
@@ -1432,7 +1428,8 @@ 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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