linux-kernel - Re: [PATCH v3 07/13] numa_maps: remove numa

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Date:	Mon, 30 Jun 2014 15:07:35 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [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@...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@...ux.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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