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memcg: remove PCG_FILE_MAPPED 

With the new lock scheme for updating memcg's page stat, we don't need a
flag PCG_FILE_MAPPED which was duplicated information of page_mapped().

[hughd@google.com: cosmetic fix]
[hughd@google.com: add comment to MEM_CGROUP_CHARGE_TYPE_MAPPED case in __mem_cgroup_uncharge_common()]
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Greg Thelen <gthelen@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Ying Han <yinghan@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KAMEZAWA Hiroyuki 2012-03-21 16:34:25 -07:00 committed by Linus Torvalds
parent 89c06bd52f
commit 2ff76f1193
2 changed files with 6 additions and 11 deletions
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6
include/linux/page_cgroup.h
View File

@ -6,8 +6,6 @@ enum {
PCG_LOCK, /* Lock for pc->mem_cgroup and following bits. */
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,
};
@ -66,10 +64,6 @@ 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)

11
mm/memcontrol.c
View File

@ -1966,10 +1966,6 @@ 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:
@ -2617,7 +2613,7 @@ static int mem_cgroup_move_account(struct page *page,
move_lock_mem_cgroup(from, &flags);
if (PageCgroupFileMapped(pc)) {
if (!anon && page_mapped(page)) {
/* Update mapped_file data for mem_cgroup */
preempt_disable();
__this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
@ -2982,6 +2978,11 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
switch (ctype) {
case MEM_CGROUP_CHARGE_TYPE_MAPPED:
/*
* Generally PageAnon tells if it's the anon statistics to be
* updated; but sometimes e.g. mem_cgroup_uncharge_page() is
* used before page reached the stage of being marked PageAnon.
*/
anon = true;
/* fallthrough */
case MEM_CGROUP_CHARGE_TYPE_DROP: