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mm, memcg: clean up reclaim iter array 

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>
This commit is contained in:
Yafang Shao 2019-11-30 17:50:03 -08:00 committed by Linus Torvalds
parent a1100a7406
commit 9da83f3fc7
2 changed files with 4 additions and 10 deletions
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3
include/linux/memcontrol.h
View File

@ -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;

11
mm/memcontrol.c
View File

@ -1052,7 +1052,7 @@ 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;
@ -1152,15 +1152,11 @@ 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);
}
}
@ -1705,7 +1701,6 @@ 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);