linux-kernel - [PATCH 1/2 v2] smaps: show VM_SOFTDIRTY flag in VmFlags line

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Message-ID: <1381155304-2ro6e10t-mutt-n-horiguchi@ah.jp.nec.com>
Date:	Mon, 07 Oct 2013 10:15:04 -0400
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2 v2] smaps: show VM_SOFTDIRTY flag in VmFlags line

On Mon, Oct 07, 2013 at 05:21:48PM +0400, Pavel Emelyanov wrote:
> On 10/04/2013 11:02 PM, Naoya Horiguchi wrote:
> > This flag shows that soft dirty bit is not enabled yet.
> > You can enable it by "echo 4 > /proc/pid/clear_refs."
> 
> The comment is not correct. Per-VMA soft-dirty flag means, that
> VMA is "newly created" one and thus represents a new (dirty) are
> in task's VM.

Thanks for the correction. I changed the description.

Naoya
---
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",
-- 
1.8.3.1

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