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Subject[PATCH v3 09/21] mm: add lruvec->reclaim_stat
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Date
Merge memcg and non-memcg reclaim stat. We need to update only one.
Move zone->reclaimer_stat and mem_cgroup_per_zone->reclaimer_stat to struct lruvec.

struct lruvec will become operating unit for recalimer logic,
thus this is perfect place for these counters.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
---
include/linux/memcontrol.h | 17 --------------
include/linux/mmzone.h | 5 +++-
mm/memcontrol.c | 52 +++++---------------------------------------
mm/page_alloc.c | 4 ---
mm/swap.c | 12 ++--------
mm/vmscan.c | 5 +++-
6 files changed, 14 insertions(+), 81 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index b9d555b..c3e46b0 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -103,10 +103,6 @@ void mem_cgroup_iter_break(struct mem_cgroup *, struct mem_cgroup *);
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,
struct task_struct *p);
extern void mem_cgroup_replace_page_cache(struct page *oldpage,
@@ -286,19 +282,6 @@ mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg, int nid, int zid,
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)
-{
- return NULL;
-}
-
static inline void
mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
{
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 69b0f31..82d5ff3 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -299,6 +299,9 @@ struct zone_reclaim_stat {
struct lruvec {
struct list_head pages_lru[NR_LRU_LISTS];
unsigned long pages_count[NR_LRU_LISTS];
+
+ struct zone_reclaim_stat reclaim_stat;
+
#ifdef CONFIG_CGROUP_MEM_RES_CTLR
struct zone *zone;
struct pglist_data *node;
@@ -379,8 +382,6 @@ 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 */

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 80ce60c..bef57db 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -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*/
@@ -441,15 +440,6 @@ struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *memcg)
return &memcg->css;
}

-static struct mem_cgroup_per_zone *
-page_cgroup_zoneinfo(struct mem_cgroup *memcg, struct page *page)
-{
- int nid = page_to_nid(page);
- int zid = page_zonenum(page);
-
- return mem_cgroup_zoneinfo(memcg, nid, zid);
-}
-
static struct mem_cgroup_tree_per_zone *
soft_limit_tree_node_zone(int nid, int zid)
{
@@ -1111,34 +1101,6 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg)
return ret;
}

-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)
-{
- struct page_cgroup *pc;
- struct mem_cgroup_per_zone *mz;
-
- if (mem_cgroup_disabled())
- return NULL;
-
- pc = lookup_page_cgroup(page);
- if (!PageCgroupUsed(pc))
- return NULL;
- /* Ensure pc->mem_cgroup is visible after reading PCG_USED. */
- smp_rmb();
- mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
- return &mz->reclaim_stat;
-}
-
#define mem_cgroup_from_res_counter(counter, member) \
container_of(counter, struct mem_cgroup, member)

@@ -4073,21 +4035,19 @@ static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft,
{
int nid, zid;
struct mem_cgroup_per_zone *mz;
+ struct zone_reclaim_stat *rs;
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);
+ rs = &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] += rs->recent_rotated[0];
+ recent_rotated[1] += rs->recent_rotated[1];
+ recent_scanned[0] += rs->recent_scanned[0];
+ recent_scanned[1] += rs->recent_scanned[1];
}
cb->fill(cb, "recent_rotated_anon", recent_rotated[0]);
cb->fill(cb, "recent_rotated_file", recent_rotated[1]);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 1cc3afe..ab42446 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4375,10 +4375,6 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,

zone_pcp_init(zone);
init_zone_lruvec(zone, &zone->lruvec);
- 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;
zap_zone_vm_stats(zone);
zone->flags = 0;
if (!size)
diff --git a/mm/swap.c b/mm/swap.c
index 2afe02c..70d1542 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -277,21 +277,13 @@ void rotate_reclaimable_page(struct page *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 = &page_lruvec(page)->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)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index b3e8bab..98bd61f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -184,9 +184,10 @@ static bool scanning_global_lru(struct mem_cgroup_zone *mz)
static struct zone_reclaim_stat *get_reclaim_stat(struct mem_cgroup_zone *mz)
{
if (!scanning_global_lru(mz))
- return mem_cgroup_get_reclaim_stat(mz->mem_cgroup, mz->zone);
+ return &mem_cgroup_zone_lruvec(mz->zone,
+ mz->mem_cgroup)->reclaim_stat;

- return &mz->zone->reclaim_stat;
+ return &mz->zone->lruvec.reclaim_stat;
}

static unsigned long zone_nr_lru_pages(struct mem_cgroup_zone *mz,


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