linux-kernel - [PATCH RFC 1/3] proc/smaps: carefully handle migration entries

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Message-ID: <20120430112903.14137.81692.stgit@zurg>
Date:	Mon, 30 Apr 2012 15:29:03 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH RFC 1/3] proc/smaps: carefully handle migration entries

Currently smaps reports migration entries as "swap",
as result "swap" can appears in shared mapping.

This patch converts migration entries into pages and handles them as usual.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
---
 fs/proc/task_mmu.c |   18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index b073971..acee5fd 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -402,18 +402,20 @@ static void smaps_pte_entry(pte_t ptent, unsigned long addr,
 {
 	struct mem_size_stats *mss = walk->private;
 	struct vm_area_struct *vma = mss->vma;
-	struct page *page;
+	struct page *page = NULL;
 	int mapcount;
 
-	if (is_swap_pte(ptent)) {
-		mss->swap += ptent_size;
-		return;
-	}
+	if (pte_present(ptent)) {
+		page = vm_normal_page(vma, addr, ptent);
+	} else if (is_swap_pte(ptent)) {
+		swp_entry_t swpent = pte_to_swp_entry(ptent);
 
-	if (!pte_present(ptent))
-		return;
+		if (!non_swap_entry(swpent))
+			mss->swap += ptent_size;
+		else if (is_migration_entry(swpent))
+			page = migration_entry_to_page(swpent);
+	}
 
-	page = vm_normal_page(vma, addr, ptent);
 	if (!page)
 		return;
 

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