linux-kernel - Re: [PATCH v4 05/13] clear_refs: remove clear_refs_private->vma and introduce clear_refs_test

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Date:	Thu, 10 Jul 2014 14:32:19 +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>,
	Jerome Marchand <jmarchan@...hat.com>,
	linux-kernel@...r.kernel.org,
	Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [PATCH v4 05/13] clear_refs: remove clear_refs_private->vma and
 introduce clear_refs_test_walk()

On Tue, Jul 01, 2014 at 01:07:23PM -0400, Naoya Horiguchi wrote:
> @@ -822,38 +844,14 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
>  		};
>  		struct mm_walk clear_refs_walk = {
>  			.pmd_entry = clear_refs_pte_range,
> +			.test_walk = clear_refs_test_walk,
>  			.mm = mm,
>  			.private = &cp,
>  		};
>  		down_read(&mm->mmap_sem);
>  		if (type == CLEAR_REFS_SOFT_DIRTY)
>  			mmu_notifier_invalidate_range_start(mm, 0, -1);
> -		for (vma = mm->mmap; vma; vma = vma->vm_next) {
> -			cp.vma = vma;
> -			if (is_vm_hugetlb_page(vma))
> -				continue;
> -			/*
> -			 * Writing 1 to /proc/pid/clear_refs affects all pages.
> -			 *
> -			 * Writing 2 to /proc/pid/clear_refs only affects
> -			 * Anonymous pages.
> -			 *
> -			 * Writing 3 to /proc/pid/clear_refs only affects file
> -			 * mapped pages.
> -			 *
> -			 * Writing 4 to /proc/pid/clear_refs affects all pages.
> -			 */
> -			if (type == CLEAR_REFS_ANON && vma->vm_file)
> -				continue;
> -			if (type == CLEAR_REFS_MAPPED && !vma->vm_file)
> -				continue;
> -			if (type == CLEAR_REFS_SOFT_DIRTY) {
> -				if (vma->vm_flags & VM_SOFTDIRTY)
> -					vma->vm_flags &= ~VM_SOFTDIRTY;
> -			}
> -			walk_page_range(vma->vm_start, vma->vm_end,
> -					&clear_refs_walk);
> -		}
> +		walk_page_range(0, ~0UL, &clear_refs_walk);

'vma' variable is now unused in the clear_refs_write().

-- 
 Kirill A. Shutemov
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