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Subject[v7 PATCH 04/12] mm: vmscan: remove memcg_shrinker_map_size
Date
Both memcg_shrinker_map_size and shrinker_nr_max is maintained, but actually the
map size can be calculated via shrinker_nr_max, so it seems unnecessary to keep both.
Remove memcg_shrinker_map_size since shrinker_nr_max is also used by iterating the
bit map.

Acked-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Yang Shi <shy828301@gmail.com>
---
mm/vmscan.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index e4ddaaaeffe2..641077b09e5d 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -185,8 +185,10 @@ static LIST_HEAD(shrinker_list);
static DECLARE_RWSEM(shrinker_rwsem);

#ifdef CONFIG_MEMCG
+static int shrinker_nr_max;

-static int memcg_shrinker_map_size;
+#define NR_MAX_TO_SHR_MAP_SIZE(nr_max) \
+ (DIV_ROUND_UP(nr_max, BITS_PER_LONG) * sizeof(unsigned long))

static void free_shrinker_map_rcu(struct rcu_head *head)
{
@@ -247,7 +249,7 @@ int alloc_shrinker_maps(struct mem_cgroup *memcg)
return 0;

down_write(&shrinker_rwsem);
- size = memcg_shrinker_map_size;
+ size = NR_MAX_TO_SHR_MAP_SIZE(shrinker_nr_max);
for_each_node(nid) {
map = kvzalloc_node(sizeof(*map) + size, GFP_KERNEL, nid);
if (!map) {
@@ -265,12 +267,13 @@ int alloc_shrinker_maps(struct mem_cgroup *memcg)
static int expand_shrinker_maps(int new_id)
{
int size, old_size, ret = 0;
+ int new_nr_max = new_id + 1;
struct mem_cgroup *memcg;

- size = DIV_ROUND_UP(new_id + 1, BITS_PER_LONG) * sizeof(unsigned long);
- old_size = memcg_shrinker_map_size;
+ size = NR_MAX_TO_SHR_MAP_SIZE(new_nr_max);
+ old_size = NR_MAX_TO_SHR_MAP_SIZE(shrinker_nr_max);
if (size <= old_size)
- return 0;
+ goto out;

if (!root_mem_cgroup)
goto out;
@@ -287,7 +290,7 @@ static int expand_shrinker_maps(int new_id)
} while ((memcg = mem_cgroup_iter(NULL, memcg, NULL)) != NULL);
out:
if (!ret)
- memcg_shrinker_map_size = size;
+ shrinker_nr_max = new_nr_max;

return ret;
}
@@ -320,7 +323,6 @@ void set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id)
#define SHRINKER_REGISTERING ((struct shrinker *)~0UL)

static DEFINE_IDR(shrinker_idr);
-static int shrinker_nr_max;

static int prealloc_memcg_shrinker(struct shrinker *shrinker)
{
@@ -337,8 +339,6 @@ static int prealloc_memcg_shrinker(struct shrinker *shrinker)
idr_remove(&shrinker_idr, id);
goto unlock;
}
-
- shrinker_nr_max = id + 1;
}
shrinker->id = id;
ret = 0;
--
2.26.2
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