>From a9b51d6204d7f8714173c46a306caf413ad25d4e Mon Sep 17 00:00:00 2001
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Date: Thu, 12 Jan 2012 18:40:26 +0900
Subject: [PATCH 5/7] memcg: remove PCG_FILE_MAPPED
Because we can update page's status and memcg's statistics without
race with move_account, this flag is unnecessary.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
---
include/linux/page_cgroup.h | 6 ------
mm/memcontrol.c | 6 +-----
2 files changed, 1 insertions(+), 11 deletions(-)
diff --git a/include/linux/page_cgroup.h b/include/linux/page_cgroup.h
index 5dba799..0b9a48a 100644
--- a/include/linux/page_cgroup.h
+++ b/include/linux/page_cgroup.h
@@ -7,8 +7,6 @@ enum {
PCG_CACHE, /* charged as cache */
PCG_USED, /* this object is in use. */
PCG_MIGRATION, /* under page migration */
- /* flags for mem_cgroup and file and I/O status */
- PCG_FILE_MAPPED, /* page is accounted as "mapped" */
__NR_PCG_FLAGS,
};
@@ -72,10 +70,6 @@ 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 30ef810..a96800d 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1952,10 +1952,6 @@ 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:
@@ -2606,7 +2602,7 @@ static int mem_cgroup_move_account(struct page *page,
mem_cgroup_account_move_wlock(page, &flags);
- if (PageCgroupFileMapped(pc)) {
+ if (page_mapcount(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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