From 7810b416999ac4e8fc3313737fe9c5e26b9d234c Mon Sep 17 00:00:00 2001
From: Yafang Shao <laoar.shao@gmail.com>
Date: Sat, 30 Nov 2019 17:50:03 -0800
Subject: [PATCH] mm, memcg: clean up reclaim iter array
References: bnc#1155780 (VM/FS functional and performance backports)
Patch-mainline: v5.5-rc1
Git-commit: 9da83f3fc74b806ee419a29977ef0239454bd8ec
The mem_cgroup_reclaim_cookie is only used in memcg softlimit reclaim now,
and the priority of the reclaim is always 0. We don't need to define the
iter in struct mem_cgroup_per_node as an array any more. That could make
the code more clear and save some space.
Link: http://lkml.kernel.org/r/1569897728-1686-1-git-send-email-laoar.shao@gmail.com
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
---
include/linux/memcontrol.h | 3 +--
mm/memcontrol.c | 11 +++--------
2 files changed, 4 insertions(+), 10 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 98380779f6d5..f1e0ef3dfb9c 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -58,7 +58,6 @@ enum mem_cgroup_protection {
struct mem_cgroup_reclaim_cookie {
pg_data_t *pgdat;
- int priority;
unsigned int generation;
};
@@ -126,7 +125,7 @@ struct mem_cgroup_per_node {
unsigned long lru_zone_size[MAX_NR_ZONES][NR_LRU_LISTS];
- struct mem_cgroup_reclaim_iter iter[DEF_PRIORITY + 1];
+ struct mem_cgroup_reclaim_iter iter;
struct memcg_shrinker_map __rcu *shrinker_map;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c6cd45dd2214..237dd63b02e6 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1051,7 +1051,7 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
struct mem_cgroup_per_node *mz;
mz = mem_cgroup_nodeinfo(root, reclaim->pgdat->node_id);
- iter = &mz->iter[reclaim->priority];
+ iter = &mz->iter;
if (prev && reclaim->generation != iter->generation)
goto out_unlock;
@@ -1151,15 +1151,11 @@ static void __invalidate_reclaim_iterators(struct mem_cgroup *from,
struct mem_cgroup_reclaim_iter *iter;
struct mem_cgroup_per_node *mz;
int nid;
- int i;
for_each_node(nid) {
mz = mem_cgroup_nodeinfo(from, nid);
- for (i = 0; i <= DEF_PRIORITY; i++) {
- iter = &mz->iter[i];
- cmpxchg(&iter->position,
- dead_memcg, NULL);
- }
+ iter = &mz->iter;
+ cmpxchg(&iter->position, dead_memcg, NULL);
}
}
@@ -1699,7 +1695,6 @@ static int mem_cgroup_soft_reclaim(struct mem_cgroup *root_memcg,
unsigned long nr_scanned;
struct mem_cgroup_reclaim_cookie reclaim = {
.pgdat = pgdat,
- .priority = 0,
};
excess = soft_limit_excess(root_memcg);