linux-kernel - Re: [PATCH 1/2 v2] smaps: show VM

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Date:	Mon, 7 Oct 2013 17:51:25 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Pavel Emelyanov <xemul@...allels.com>, linux-mm@...ck.org,
	Wu Fengguang <fengguang.wu@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2 v2] smaps: show VM_SOFTDIRTY flag in VmFlags line

On Mon, 07 Oct 2013 10:15:04 -0400 Naoya Horiguchi <n-horiguchi@...jp.nec.com> wrote:

> From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Date: Fri, 4 Oct 2013 13:42:13 -0400
> Subject: [PATCH] smaps: show VM_SOFTDIRTY flag in VmFlags line
> 
> This flag shows that the VMA is "newly created" and thus represents
> "dirty" in the task's VM.
> You can clear it by "echo 4 > /proc/pid/clear_refs."
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> ---
>  fs/proc/task_mmu.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 7366e9d..c591928 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -561,6 +561,9 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
>  		[ilog2(VM_NONLINEAR)]	= "nl",
>  		[ilog2(VM_ARCH_1)]	= "ar",
>  		[ilog2(VM_DONTDUMP)]	= "dd",
> +#ifdef CONFIG_MEM_SOFT_DIRTY
> +		[ilog2(VM_SOFTDIRTY)]	= "sd",
> +#endif
>  		[ilog2(VM_MIXEDMAP)]	= "mm",
>  		[ilog2(VM_HUGEPAGE)]	= "hg",
>  		[ilog2(VM_NOHUGEPAGE)]	= "nh",

Documentation/filesystems/proc.txt needs updating, please.
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