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Subject[PATCH 2/10] mm/memcg: move reclaim_stat into lruvec
With mem_cgroup_disabled() now explicit, it becomes clear that the
zone_reclaim_stat structure actually belongs in lruvec, per-zone
when memcg is disabled but per-memcg per-zone when it's enabled.

We can delete mem_cgroup_get_reclaim_stat(), and change
update_page_reclaim_stat() to update just the one set of stats,
the one which get_scan_count() will actually use.

Signed-off-by: Hugh Dickins <hughd@google.com>
---
include/linux/memcontrol.h | 9 ---------
include/linux/mmzone.h | 29 ++++++++++++++---------------
mm/memcontrol.c | 27 +++++++--------------------
mm/page_alloc.c | 8 ++++----
mm/swap.c | 14 ++++----------
mm/vmscan.c | 5 +----
6 files changed, 30 insertions(+), 62 deletions(-)

--- mmotm.orig/include/linux/memcontrol.h 2012-02-18 11:56:52.015523388 -0800
+++ mmotm/include/linux/memcontrol.h 2012-02-18 11:57:20.391524062 -0800
@@ -120,8 +120,6 @@ int mem_cgroup_inactive_file_is_low(stru
int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg,
int nid, int zid, unsigned int lrumask);
-struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
- struct zone *zone);
struct zone_reclaim_stat*
mem_cgroup_get_reclaim_stat_from_page(struct page *page);
extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
@@ -351,13 +349,6 @@ mem_cgroup_zone_nr_lru_pages(struct mem_
return 0;
}

-
-static inline struct zone_reclaim_stat*
-mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
-{
- return NULL;
-}
-
static inline struct zone_reclaim_stat*
mem_cgroup_get_reclaim_stat_from_page(struct page *page)
{
--- mmotm.orig/include/linux/mmzone.h 2012-02-18 11:56:52.015523388 -0800
+++ mmotm/include/linux/mmzone.h 2012-02-18 11:57:20.391524062 -0800
@@ -159,8 +159,22 @@ static inline int is_unevictable_lru(enu
return (lru == LRU_UNEVICTABLE);
}

+struct zone_reclaim_stat {
+ /*
+ * The pageout code in vmscan.c keeps track of how many of the
+ * mem/swap backed and file backed pages are refeferenced.
+ * The higher the rotated/scanned ratio, the more valuable
+ * that cache is.
+ *
+ * The anon LRU stats live in [0], file LRU stats in [1]
+ */
+ unsigned long recent_rotated[2];
+ unsigned long recent_scanned[2];
+};
+
struct lruvec {
struct list_head lists[NR_LRU_LISTS];
+ struct zone_reclaim_stat reclaim_stat;
};

/* Mask used at gathering information at once (see memcontrol.c) */
@@ -287,19 +301,6 @@ enum zone_type {
#error ZONES_SHIFT -- too many zones configured adjust calculation
#endif

-struct zone_reclaim_stat {
- /*
- * The pageout code in vmscan.c keeps track of how many of the
- * mem/swap backed and file backed pages are refeferenced.
- * The higher the rotated/scanned ratio, the more valuable
- * that cache is.
- *
- * The anon LRU stats live in [0], file LRU stats in [1]
- */
- unsigned long recent_rotated[2];
- unsigned long recent_scanned[2];
-};
-
struct zone {
/* Fields commonly accessed by the page allocator */

@@ -374,8 +375,6 @@ struct zone {
spinlock_t lru_lock;
struct lruvec lruvec;

- struct zone_reclaim_stat reclaim_stat;
-
unsigned long pages_scanned; /* since last reclaim */
unsigned long flags; /* zone flags, see below */

--- mmotm.orig/mm/memcontrol.c 2012-02-18 11:56:52.015523388 -0800
+++ mmotm/mm/memcontrol.c 2012-02-18 11:57:20.391524062 -0800
@@ -138,7 +138,6 @@ struct mem_cgroup_per_zone {

struct mem_cgroup_reclaim_iter reclaim_iter[DEF_PRIORITY + 1];

- struct zone_reclaim_stat reclaim_stat;
struct rb_node tree_node; /* RB tree node */
unsigned long long usage_in_excess;/* Set to the value by which */
/* the soft limit is exceeded*/
@@ -1200,16 +1199,6 @@ int mem_cgroup_inactive_file_is_low(stru
return (active > inactive);
}

-struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
- struct zone *zone)
-{
- int nid = zone_to_nid(zone);
- int zid = zone_idx(zone);
- struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid);
-
- return &mz->reclaim_stat;
-}
-
struct zone_reclaim_stat *
mem_cgroup_get_reclaim_stat_from_page(struct page *page)
{
@@ -1225,7 +1214,7 @@ mem_cgroup_get_reclaim_stat_from_page(st
/* Ensure pc->mem_cgroup is visible after reading PCG_USED. */
smp_rmb();
mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
- return &mz->reclaim_stat;
+ return &mz->lruvec.reclaim_stat;
}

#define mem_cgroup_from_res_counter(counter, member) \
@@ -4193,21 +4182,19 @@ static int mem_control_stat_show(struct
{
int nid, zid;
struct mem_cgroup_per_zone *mz;
+ struct zone_reclaim_stat *rstat;
unsigned long recent_rotated[2] = {0, 0};
unsigned long recent_scanned[2] = {0, 0};

for_each_online_node(nid)
for (zid = 0; zid < MAX_NR_ZONES; zid++) {
mz = mem_cgroup_zoneinfo(memcg, nid, zid);
+ rstat = &mz->lruvec.reclaim_stat;

- recent_rotated[0] +=
- mz->reclaim_stat.recent_rotated[0];
- recent_rotated[1] +=
- mz->reclaim_stat.recent_rotated[1];
- recent_scanned[0] +=
- mz->reclaim_stat.recent_scanned[0];
- recent_scanned[1] +=
- mz->reclaim_stat.recent_scanned[1];
+ recent_rotated[0] += rstat->recent_rotated[0];
+ recent_rotated[1] += rstat->recent_rotated[1];
+ recent_scanned[0] += rstat->recent_scanned[0];
+ recent_scanned[1] += rstat->recent_scanned[1];
}
cb->fill(cb, "recent_rotated_anon", recent_rotated[0]);
cb->fill(cb, "recent_rotated_file", recent_rotated[1]);
--- mmotm.orig/mm/page_alloc.c 2012-02-18 11:56:52.015523388 -0800
+++ mmotm/mm/page_alloc.c 2012-02-18 11:57:20.395524062 -0800
@@ -4367,10 +4367,10 @@ static void __paginginit free_area_init_
zone_pcp_init(zone);
for_each_lru(lru)
INIT_LIST_HEAD(&zone->lruvec.lists[lru]);
- zone->reclaim_stat.recent_rotated[0] = 0;
- zone->reclaim_stat.recent_rotated[1] = 0;
- zone->reclaim_stat.recent_scanned[0] = 0;
- zone->reclaim_stat.recent_scanned[1] = 0;
+ zone->lruvec.reclaim_stat.recent_rotated[0] = 0;
+ zone->lruvec.reclaim_stat.recent_rotated[1] = 0;
+ zone->lruvec.reclaim_stat.recent_scanned[0] = 0;
+ zone->lruvec.reclaim_stat.recent_scanned[1] = 0;
zap_zone_vm_stats(zone);
zone->flags = 0;
if (!size)
--- mmotm.orig/mm/swap.c 2012-02-18 11:56:52.015523388 -0800
+++ mmotm/mm/swap.c 2012-02-18 11:57:20.395524062 -0800
@@ -279,21 +279,15 @@ void rotate_reclaimable_page(struct page
static void update_page_reclaim_stat(struct zone *zone, struct page *page,
int file, int rotated)
{
- struct zone_reclaim_stat *reclaim_stat = &zone->reclaim_stat;
- struct zone_reclaim_stat *memcg_reclaim_stat;
+ struct zone_reclaim_stat *reclaim_stat;

- memcg_reclaim_stat = mem_cgroup_get_reclaim_stat_from_page(page);
+ reclaim_stat = mem_cgroup_get_reclaim_stat_from_page(page);
+ if (!reclaim_stat)
+ reclaim_stat = &zone->lruvec.reclaim_stat;

reclaim_stat->recent_scanned[file]++;
if (rotated)
reclaim_stat->recent_rotated[file]++;
-
- if (!memcg_reclaim_stat)
- return;
-
- memcg_reclaim_stat->recent_scanned[file]++;
- if (rotated)
- memcg_reclaim_stat->recent_rotated[file]++;
}

static void __activate_page(struct page *page, void *arg)
--- mmotm.orig/mm/vmscan.c 2012-02-18 11:57:09.719523809 -0800
+++ mmotm/mm/vmscan.c 2012-02-18 11:57:20.395524062 -0800
@@ -173,10 +173,7 @@ static bool global_reclaim(struct scan_c

static struct zone_reclaim_stat *get_reclaim_stat(struct mem_cgroup_zone *mz)
{
- if (!mem_cgroup_disabled())
- return mem_cgroup_get_reclaim_stat(mz->mem_cgroup, mz->zone);
-
- return &mz->zone->reclaim_stat;
+ return &mem_cgroup_zone_lruvec(mz->zone, mz->mem_cgroup)->reclaim_stat;
}

static unsigned long zone_nr_lru_pages(struct mem_cgroup_zone *mz,

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