linux-kernel - Re: [PATCH 1/2] hugetlbfs: stop setting VM_DONTDUMP in initializing vma(VM

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Date:	Thu, 28 Mar 2013 21:03:16 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] hugetlbfs: stop setting VM_DONTDUMP in initializing
 vma(VM_HUGETLB)

Naoya Horiguchi wrote:
> Currently we fail to include any data on hugepages into coredump,
> because VM_DONTDUMP is set on hugetlbfs's vma. This behavior was recently
> introduced by commit 314e51b98 "mm: kill vma flag VM_RESERVED and
> mm->reserved_vm counter". This looks to me a serious regression,
> so let's fix it.

That was introduced in my patch? Really?
Here was VM_RESERVED and it had the same effect as VM_DONTDUMP. At least I thought so.

>
> Signed-off-by: Naoya Horiguchi<n-horiguchi@...jp.nec.com>
> Cc: Konstantin Khlebnikov<khlebnikov@...nvz.org>
> ---
>   fs/hugetlbfs/inode.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git v3.9-rc3.orig/fs/hugetlbfs/inode.c v3.9-rc3/fs/hugetlbfs/inode.c
> index 84e3d85..523464e 100644
> --- v3.9-rc3.orig/fs/hugetlbfs/inode.c
> +++ v3.9-rc3/fs/hugetlbfs/inode.c
> @@ -110,7 +110,7 @@ static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma)
>   	 * way when do_mmap_pgoff unwinds (may be important on powerpc
>   	 * and ia64).
>   	 */
> -	vma->vm_flags |= VM_HUGETLB | VM_DONTEXPAND | VM_DONTDUMP;
> +	vma->vm_flags |= VM_HUGETLB | VM_DONTEXPAND;
>   	vma->vm_ops =&hugetlb_vm_ops;
>
>   	if (vma->vm_pgoff&  (~huge_page_mask(h)>>  PAGE_SHIFT))

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