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Subject[PATCH 3/3] mm: memcontrol: Remove lruvec_stat
Date
lruvec_stat doesn't have any consumer.  Remove it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/memcontrol.h | 40 ----------------------------------------
mm/memcontrol.c | 36 ++----------------------------------
2 files changed, 2 insertions(+), 74 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 0cf6d5a..85a8f00 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -103,19 +103,12 @@ struct mem_cgroup_reclaim_iter {
unsigned int generation;
};

-struct lruvec_stat {
- long count[NR_VM_NODE_STAT_ITEMS];
-};
-
/*
* per-zone information in memory controller.
*/
struct mem_cgroup_per_node {
struct lruvec lruvec;

- struct lruvec_stat __percpu *lruvec_stat_cpu;
- atomic_long_t lruvec_stat[NR_VM_NODE_STAT_ITEMS];
-
unsigned long lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS];

struct mem_cgroup_reclaim_iter iter[DEF_PRIORITY + 1];
@@ -602,29 +595,10 @@ static inline void mod_memcg_page_state(struct page *page,
mod_memcg_state(page->mem_cgroup, idx, val);
}

-static inline unsigned long lruvec_page_state(struct lruvec *lruvec,
- enum node_stat_item idx)
-{
- struct mem_cgroup_per_node *pn;
- long x;
-
- if (mem_cgroup_disabled())
- return node_page_state(lruvec_pgdat(lruvec), idx);
-
- pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
- x = atomic_long_read(&pn->lruvec_stat[idx]);
-#ifdef CONFIG_SMP
- if (x < 0)
- x = 0;
-#endif
- return x;
-}
-
static inline void __mod_lruvec_state(struct lruvec *lruvec,
enum node_stat_item idx, int val)
{
struct mem_cgroup_per_node *pn;
- long x;

/* Update node */
__mod_node_page_state(lruvec_pgdat(lruvec), idx, val);
@@ -636,14 +610,6 @@ static inline void __mod_lruvec_state(struct lruvec *lruvec,

/* Update memcg */
__mod_memcg_state(pn->memcg, idx, val);
-
- /* Update lruvec */
- x = val + __this_cpu_read(pn->lruvec_stat_cpu->count[idx]);
- if (unlikely(abs(x) > MEMCG_CHARGE_BATCH)) {
- atomic_long_add(x, &pn->lruvec_stat[idx]);
- x = 0;
- }
- __this_cpu_write(pn->lruvec_stat_cpu->count[idx], x);
}

static inline void mod_lruvec_state(struct lruvec *lruvec,
@@ -967,12 +933,6 @@ static inline void mod_memcg_page_state(struct page *page,
{
}

-static inline unsigned long lruvec_page_state(struct lruvec *lruvec,
- enum node_stat_item idx)
-{
- return node_page_state(lruvec_pgdat(lruvec), idx);
-}
-
static inline void __mod_lruvec_state(struct lruvec *lruvec,
enum node_stat_item idx, int val)
{
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 03d1b30..d5bf01d 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1815,30 +1815,7 @@ static void drain_all_stock(struct mem_cgroup *root_memcg)

static int memcg_hotplug_cpu_dead(unsigned int cpu)
{
- struct memcg_stock_pcp *stock;
- struct mem_cgroup *memcg;
-
- stock = &per_cpu(memcg_stock, cpu);
- drain_stock(stock);
-
- for_each_mem_cgroup(memcg) {
- int i;
-
- for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
- int nid;
- long x;
-
- for_each_node(nid) {
- struct mem_cgroup_per_node *pn;
-
- pn = mem_cgroup_nodeinfo(memcg, nid);
- x = this_cpu_xchg(pn->lruvec_stat_cpu->count[i], 0);
- if (x)
- atomic_long_add(x, &pn->lruvec_stat[i]);
- }
- }
- }
-
+ drain_stock(&per_cpu(memcg_stock, cpu));
return 0;
}

@@ -4056,12 +4033,6 @@ static int alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
if (!pn)
return 1;

- pn->lruvec_stat_cpu = alloc_percpu(struct lruvec_stat);
- if (!pn->lruvec_stat_cpu) {
- kfree(pn);
- return 1;
- }
-
lruvec_init(&pn->lruvec);
pn->usage_in_excess = 0;
pn->on_tree = false;
@@ -4073,10 +4044,7 @@ static int alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)

static void free_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
{
- struct mem_cgroup_per_node *pn = memcg->nodeinfo[node];
-
- free_percpu(pn->lruvec_stat_cpu);
- kfree(pn);
+ kfree(memcg->nodeinfo[node]);
}

static void __mem_cgroup_free(struct mem_cgroup *memcg)
--
2.9.5
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