From: Konstantin Khlebnikov <khlebnikov@openvz.org>
Date: Thu, 31 May 2012 23:26:20 +0000 (-0700)
Subject: proc/smaps: carefully handle migration entries
X-Git-Tag: firefly_0821_release~3680^2~2684^2~42
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b1d4d9e0cbd0aecf40c3572e0c8f98de31b3b328;p=firefly-linux-kernel-4.4.55.git

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@openvz.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 02476f5889f1..e2c1155ac09a 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;