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

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Message-ID: <20130329134727.GA21879@dhcp22.suse.cz>
Date:	Fri, 29 Mar 2013 14:47:27 +0100
From:	Michal Hocko <mhocko@...e.cz>
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>,
	stable@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Subject: Re: [PATCH 1/2] hugetlbfs: stop setting VM_DONTDUMP in initializing
 vma(VM_HUGETLB)

On Thu 28-03-13 11:42:37, 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.
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Cc: Konstantin Khlebnikov <khlebnikov@...nvz.org>

Acked-by: Michal Hocko <mhocko@...e.cz>

> ---
>  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))
> -- 
> 1.7.11.7
> 
> --
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-- 
Michal Hocko
SUSE Labs
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