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

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Date:	Mon, 07 Oct 2013 22:54:54 -0400
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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, Oct 07, 2013 at 05:51:25PM -0700, Andrew Morton wrote:
> 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.

OK. Here's the revised one.
---
From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Date: Mon, 7 Oct 2013 22:52:00 -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>
Acked-by: Cyrill Gorcunov <gorcunov@...nvz.org>
---
 Documentation/filesystems/proc.txt | 1 +
 fs/proc/task_mmu.c                 | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 823c95f..22d89aa3 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -460,6 +460,7 @@ flags associated with the particular virtual memory area in two letter encoded
     nl  - non-linear mapping
     ar  - architecture specific flag
     dd  - do not include area into core dump
+    sd  - soft-dirty flag
     mm  - mixed map area
     hg  - huge page advise flag
     nh  - no-huge page advise flag
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",
-- 
1.8.3.1





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