From: Muchun Song <songmuchun@bytedance.com>
To: willy@infradead.org, akpm@linux-foundation.org,
hannes@cmpxchg.org, mhocko@kernel.org, vdavydov.dev@gmail.com,
shakeelb@google.com, guro@fb.com, shy828301@gmail.com,
alexs@kernel.org, richard.weiyang@gmail.com, david@fromorbit.com,
trond.myklebust@hammerspace.com, anna.schumaker@netapp.com
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, linux-nfs@vger.kernel.org,
zhengqi.arch@bytedance.com, duanxiongchun@bytedance.com,
fam.zheng@bytedance.com, Muchun Song <songmuchun@bytedance.com>
Subject: [PATCH 04/17] mm: memcontrol: move memcg_online_kmem() to mem_cgroup_css_online()
Date: Tue, 11 May 2021 18:46:34 +0800 [thread overview]
Message-ID: <20210511104647.604-5-songmuchun@bytedance.com> (raw)
In-Reply-To: <20210511104647.604-1-songmuchun@bytedance.com>
Move memcg_online_kmem() to mem_cgroup_css_online() to simplify the
code. In this case, we can remove memcg_free_kmem().
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
mm/memcontrol.c | 41 ++++++++++++++++-------------------------
1 file changed, 16 insertions(+), 25 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e161a319982a..0d1c09873bad 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3460,6 +3460,9 @@ static int memcg_online_kmem(struct mem_cgroup *memcg)
if (cgroup_memory_nokmem)
return 0;
+ if (mem_cgroup_is_root(memcg))
+ return 0;
+
BUG_ON(memcg->kmemcg_id >= 0);
memcg_id = memcg_alloc_cache_id();
@@ -3486,6 +3489,9 @@ static void memcg_offline_kmem(struct mem_cgroup *memcg)
struct mem_cgroup *parent;
int kmemcg_id;
+ if (mem_cgroup_is_root(memcg))
+ return;
+
parent = parent_mem_cgroup(memcg);
if (!parent)
parent = root_mem_cgroup;
@@ -3499,14 +3505,6 @@ static void memcg_offline_kmem(struct mem_cgroup *memcg)
memcg_drain_all_list_lrus(kmemcg_id, parent);
memcg_free_cache_id(kmemcg_id);
- memcg->kmemcg_id = -1;
-}
-
-static void memcg_free_kmem(struct mem_cgroup *memcg)
-{
- /* css_alloc() failed, offlining didn't happen */
- if (unlikely(memcg->kmemcg_id != -1))
- memcg_offline_kmem(memcg);
}
#else
static int memcg_online_kmem(struct mem_cgroup *memcg)
@@ -3516,9 +3514,6 @@ static int memcg_online_kmem(struct mem_cgroup *memcg)
static void memcg_offline_kmem(struct mem_cgroup *memcg)
{
}
-static void memcg_free_kmem(struct mem_cgroup *memcg)
-{
-}
#endif /* CONFIG_MEMCG_KMEM */
static int memcg_update_kmem_max(struct mem_cgroup *memcg,
@@ -5047,7 +5042,6 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
{
struct mem_cgroup *parent = mem_cgroup_from_css(parent_css);
struct mem_cgroup *memcg, *old_memcg;
- long error = -ENOMEM;
old_memcg = set_active_memcg(parent);
memcg = mem_cgroup_alloc();
@@ -5077,38 +5071,36 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
}
/* The following stuff does not apply to the root */
- error = memcg_online_kmem(memcg);
- if (error)
- goto fail;
-
if (cgroup_subsys_on_dfl(memory_cgrp_subsys) && !cgroup_memory_nosocket)
static_branch_inc(&memcg_sockets_enabled_key);
return &memcg->css;
-fail:
- mem_cgroup_id_remove(memcg);
- mem_cgroup_free(memcg);
- return ERR_PTR(error);
}
static int mem_cgroup_css_online(struct cgroup_subsys_state *css)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
+ if (memcg_online_kmem(memcg))
+ goto remove_id;
+
/*
* A memcg must be visible for expand_shrinker_info()
* by the time the maps are allocated. So, we allocate maps
* here, when for_each_mem_cgroup() can't skip it.
*/
- if (alloc_shrinker_info(memcg)) {
- mem_cgroup_id_remove(memcg);
- return -ENOMEM;
- }
+ if (alloc_shrinker_info(memcg))
+ goto offline_kmem;
/* Online state pins memcg ID, memcg ID pins CSS */
refcount_set(&memcg->id.ref, 1);
css_get(css);
return 0;
+offline_kmem:
+ memcg_offline_kmem(memcg);
+remove_id:
+ mem_cgroup_id_remove(memcg);
+ return -ENOMEM;
}
static void mem_cgroup_css_offline(struct cgroup_subsys_state *css)
@@ -5166,7 +5158,6 @@ static void mem_cgroup_css_free(struct cgroup_subsys_state *css)
cancel_work_sync(&memcg->high_work);
mem_cgroup_remove_from_trees(memcg);
free_shrinker_info(memcg);
- memcg_free_kmem(memcg);
mem_cgroup_free(memcg);
}
--
2.11.0
next prev parent reply other threads:[~2021-05-11 10:51 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-11 10:46 [PATCH 00/17] Optimize list lru memory consumption Muchun Song
2021-05-11 10:46 ` [PATCH 01/17] mm: list_lru: fix list_lru_count_one() return value Muchun Song
2021-05-11 10:46 ` [PATCH 02/17] mm: memcontrol: remove kmemcg_id reparenting Muchun Song
2021-05-11 10:46 ` [PATCH 03/17] mm: memcontrol: remove the kmem states Muchun Song
2021-05-11 10:46 ` Muchun Song [this message]
2021-05-11 10:46 ` [PATCH 05/17] mm: list_lru: remove holding lru node lock Muchun Song
2021-05-11 10:46 ` [PATCH 06/17] mm: list_lru: only add the memcg aware lrus to the list Muchun Song
2021-05-11 10:46 ` [PATCH 07/17] mm: list_lru: optimize the array of per memcg lists Muchun Song
2021-05-11 10:46 ` [PATCH 08/17] mm: list_lru: remove memcg_aware from struct list_lru Muchun Song
2021-05-11 10:46 ` [PATCH 09/17] mm: introduce kmem_cache_alloc_lru Muchun Song
2021-05-11 10:46 ` [PATCH 10/17] fs: introduce alloc_inode_sb() to allocate filesystems specific inode Muchun Song
2021-05-11 23:40 ` Dave Chinner
2021-05-12 3:20 ` [External] " Muchun Song
2021-05-11 10:46 ` [PATCH 11/17] mm: dcache: use kmem_cache_alloc_lru() to allocate dentry Muchun Song
2021-05-11 10:46 ` [PATCH 12/17] xarray: replace kmem_cache_alloc with kmem_cache_alloc_lru Muchun Song
2021-05-11 10:46 ` [PATCH 13/17] mm: workingset: allocate list_lru on xa_node allocation Muchun Song
2021-05-11 10:46 ` [PATCH 14/17] nfs42: use a specific kmem_cache to allocate nfs4_xattr_entry Muchun Song
2021-05-11 10:46 ` [PATCH 15/17] mm: list_lru: allocate list_lru_one only when needed Muchun Song
2021-05-11 10:46 ` [PATCH 16/17] mm: list_lru: rename memcg_drain_all_list_lrus to memcg_reparent_list_lrus Muchun Song
2021-05-11 10:46 ` [PATCH 17/17] mm: list_lru: replace linear array with xarray Muchun Song
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