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Date: Wed, 28 Oct 2020 11:50:13 +0800
From: Muchun Song <songmuchun@...edance.com>
To: hannes@...xchg.org, mhocko@...nel.org, vdavydov.dev@...il.com,
akpm@...ux-foundation.org, shakeelb@...gle.com, guro@...com,
iamjoonsoo.kim@....com, laoar.shao@...il.com, chris@...isdown.name,
christian.brauner@...ntu.com, peterz@...radead.org,
mingo@...nel.org, keescook@...omium.org, tglx@...utronix.de,
esyr@...hat.com, surenb@...gle.com, areber@...hat.com,
elver@...gle.com
Cc: linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
linux-mm@...ck.org, Muchun Song <songmuchun@...edance.com>
Subject: [PATCH v2] mm: memcontrol: Simplify the mem_cgroup_page_lruvec
We can reuse the code of mem_cgroup_lruvec() to simplify the code
of the mem_cgroup_page_lruvec().
Signed-off-by: Muchun Song <songmuchun@...edance.com>
---
changelog in v2:
1. Move mem_cgroup_node_lruvec to memcontrol.c to avoid abuse.
include/linux/memcontrol.h | 41 ++++-------------------------
mm/memcontrol.c | 53 ++++++++++++++++++++++++++------------
2 files changed, 42 insertions(+), 52 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 95807bf6be64..bbdc694d26b1 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -445,48 +445,17 @@ void mem_cgroup_uncharge_list(struct list_head *page_list);
void mem_cgroup_migrate(struct page *oldpage, struct page *newpage);
-static struct mem_cgroup_per_node *
+static inline struct mem_cgroup_per_node *
mem_cgroup_nodeinfo(struct mem_cgroup *memcg, int nid)
{
return memcg->nodeinfo[nid];
}
-/**
- * mem_cgroup_lruvec - get the lru list vector for a memcg & node
- * @memcg: memcg of the wanted lruvec
- *
- * Returns the lru list vector holding pages for a given @memcg &
- * @node combination. This can be the node lruvec, if the memory
- * controller is disabled.
- */
-static inline struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg,
- struct pglist_data *pgdat)
-{
- struct mem_cgroup_per_node *mz;
- struct lruvec *lruvec;
-
- if (mem_cgroup_disabled()) {
- lruvec = &pgdat->__lruvec;
- goto out;
- }
-
- if (!memcg)
- memcg = root_mem_cgroup;
-
- mz = mem_cgroup_nodeinfo(memcg, pgdat->node_id);
- lruvec = &mz->lruvec;
-out:
- /*
- * Since a node can be onlined after the mem_cgroup was created,
- * we have to be prepared to initialize lruvec->pgdat here;
- * and if offlined then reonlined, we need to reinitialize it.
- */
- if (unlikely(lruvec->pgdat != pgdat))
- lruvec->pgdat = pgdat;
- return lruvec;
-}
+struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg,
+ struct pglist_data *pgdat);
-struct lruvec *mem_cgroup_page_lruvec(struct page *, struct pglist_data *);
+struct lruvec *mem_cgroup_page_lruvec(struct page *page,
+ struct pglist_data *pgdat);
struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index bbd40c5af61e..28095a1711aa 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1332,18 +1332,15 @@ int mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
return ret;
}
-/**
- * mem_cgroup_page_lruvec - return lruvec for isolating/putting an LRU page
- * @page: the page
- * @pgdat: pgdat of the page
- *
- * This function relies on page->mem_cgroup being stable - see the
- * access rules in commit_charge().
+/*
+ * Note: Do not use this function directly. Please use mem_cgroup_lruvec()
+ * or mem_cgroup_page_lruvec() instead.
*/
-struct lruvec *mem_cgroup_page_lruvec(struct page *page, struct pglist_data *pgdat)
+static struct lruvec *
+__mem_cgroup_node_lruvec(struct mem_cgroup *memcg, struct pglist_data *pgdat,
+ int nid)
{
struct mem_cgroup_per_node *mz;
- struct mem_cgroup *memcg;
struct lruvec *lruvec;
if (mem_cgroup_disabled()) {
@@ -1351,20 +1348,15 @@ struct lruvec *mem_cgroup_page_lruvec(struct page *page, struct pglist_data *pgd
goto out;
}
- memcg = page->mem_cgroup;
- /*
- * Swapcache readahead pages are added to the LRU - and
- * possibly migrated - before they are charged.
- */
if (!memcg)
memcg = root_mem_cgroup;
- mz = mem_cgroup_page_nodeinfo(memcg, page);
+ mz = mem_cgroup_nodeinfo(memcg, nid);
lruvec = &mz->lruvec;
out:
/*
* Since a node can be onlined after the mem_cgroup was created,
- * we have to be prepared to initialize lruvec->zone here;
+ * we have to be prepared to initialize lruvec->pgdat here;
* and if offlined then reonlined, we need to reinitialize it.
*/
if (unlikely(lruvec->pgdat != pgdat))
@@ -1372,6 +1364,35 @@ struct lruvec *mem_cgroup_page_lruvec(struct page *page, struct pglist_data *pgd
return lruvec;
}
+/**
+ * mem_cgroup_lruvec - get the lru list vector for a memcg & node
+ * @memcg: memcg of the wanted lruvec
+ *
+ * Returns the lru list vector holding pages for a given @memcg &
+ * @node combination. This can be the node lruvec, if the memory
+ * controller is disabled.
+ */
+struct lruvec *mem_cgroup_lruvec(struct mem_cgroup *memcg,
+ struct pglist_data *pgdat)
+{
+ return __mem_cgroup_node_lruvec(memcg, pgdat, pgdat->node_id);
+}
+
+/**
+ * mem_cgroup_page_lruvec - return lruvec for isolating/putting an LRU page
+ * @page: the page
+ * @pgdat: pgdat of the page
+ *
+ * This function relies on page->mem_cgroup being stable - see the
+ * access rules in commit_charge().
+ */
+struct lruvec *mem_cgroup_page_lruvec(struct page *page,
+ struct pglist_data *pgdat)
+{
+ return __mem_cgroup_node_lruvec(page->mem_cgroup, pgdat,
+ page_to_nid(page));
+}
+
/**
* mem_cgroup_update_lru_size - account for adding or removing an lru page
* @lruvec: mem_cgroup per zone lru vector
--
2.20.1
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