[RFC][PATCH 3/5] memcg: remove PCG_FILE_MAPPED

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>From d258ed6571b779caed871f47a26016cc25c0ed92 Mon Sep 17 00:00:00 2001
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Date: Thu, 15 Dec 2011 11:51:17 +0900
Subject: [PATCH 3/5] memcg: remove PCG_FILE_MAPPED

Now, updating page stats (for memcg) and moving account is mutually
executed and we don't need FILE_MAPPED flag. We can see page's
status itself.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
---
 include/linux/page_cgroup.h |    5 -----
 mm/memcontrol.c             |    6 +-----
 2 files changed, 1 insertions(+), 10 deletions(-)

diff --git a/include/linux/page_cgroup.h b/include/linux/page_cgroup.h
index 2cddacf..e4cb1bf 100644
--- a/include/linux/page_cgroup.h
+++ b/include/linux/page_cgroup.h
@@ -9,7 +9,6 @@ enum {
 	PCG_MIGRATION, /* under page migration */
 	/* flags for mem_cgroup and file and I/O status */
 	PCG_MOVE_LOCK, /* For race between move_account v.s. following bits */
-	PCG_FILE_MAPPED, /* page is accounted as "mapped" */
 	__NR_PCG_FLAGS,
 };
 
@@ -73,10 +72,6 @@ TESTPCGFLAG(Used, USED)
 CLEARPCGFLAG(Used, USED)
 SETPCGFLAG(Used, USED)
 
-SETPCGFLAG(FileMapped, FILE_MAPPED)
-CLEARPCGFLAG(FileMapped, FILE_MAPPED)
-TESTPCGFLAG(FileMapped, FILE_MAPPED)
-
 SETPCGFLAG(Migration, MIGRATION)
 CLEARPCGFLAG(Migration, MIGRATION)
 TESTPCGFLAG(Migration, MIGRATION)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f4e6d5c..907359c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1878,10 +1878,6 @@ void __mem_cgroup_update_page_stat(struct page *page,
 
 	switch (idx) {
 	case MEMCG_NR_FILE_MAPPED:
-		if (val > 0)
-			SetPageCgroupFileMapped(pc);
-		else if (!page_mapped(page))
-			ClearPageCgroupFileMapped(pc);
 		idx = MEM_CGROUP_STAT_FILE_MAPPED;
 		break;
 	default:
@@ -2499,7 +2495,7 @@ static int mem_cgroup_move_account(struct page *page,
 
 	move_lock_page_cgroup(pc, &flags);
 
-	if (PageCgroupFileMapped(pc)) {
+	if (page_mapped(page) && !PageAnon(page)) {
 		/* Update mapped_file data for mem_cgroup */
 		preempt_disable();
 		__this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
-- 
1.7.4.1


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