linux-kernel - [PATCH v1 1/9] mm: memcg: move memcg_account

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Date: Fri, 28 Jun 2024 21:03:09 +0000
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>,
	Roman Gushchin <roman.gushchin@...ux.dev>
Subject: [PATCH v1 1/9] mm: memcg: move memcg_account_kmem() to memcontrol-v1.c

memcg_account_kmem() consists of a trivial statistics change via
mod_memcg_state() call and a relatively large memcg1-specific part.

Let's factor out the mod_memcg_state() call and move the rest into
the mm/memcontrol-v1.c file. Also rename memcg_account_kmem()
into memcg1_account_kmem() for consistency.

Signed-off-by: Roman Gushchin <roman.gushchin@...ux.dev>
---
 mm/memcontrol-v1.c | 12 ++++++++++++
 mm/memcontrol-v1.h |  2 ++
 mm/memcontrol.c    | 31 ++++++++++---------------------
 3 files changed, 24 insertions(+), 21 deletions(-)

diff --git a/mm/memcontrol-v1.c b/mm/memcontrol-v1.c
index 6ac47954eefc..c73a0ff0cc39 100644
--- a/mm/memcontrol-v1.c
+++ b/mm/memcontrol-v1.c
@@ -2913,6 +2913,18 @@ struct cftype memsw_files[] = {
 	{ },	/* terminate */
 };
 
+#ifdef CONFIG_MEMCG_KMEM
+void memcg1_account_kmem(struct mem_cgroup *memcg, int nr_pages)
+{
+	if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) {
+		if (nr_pages > 0)
+			page_counter_charge(&memcg->kmem, nr_pages);
+		else
+			page_counter_uncharge(&memcg->kmem, -nr_pages);
+	}
+}
+#endif /* CONFIG_MEMCG_KMEM */
+
 static int __init memcg1_init(void)
 {
 	int node;
diff --git a/mm/memcontrol-v1.h b/mm/memcontrol-v1.h
index 64b053d7f131..61620e2b0bf0 100644
--- a/mm/memcontrol-v1.h
+++ b/mm/memcontrol-v1.h
@@ -107,6 +107,7 @@ void memcg1_check_events(struct mem_cgroup *memcg, int nid);
 
 void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s);
 
+void memcg1_account_kmem(struct mem_cgroup *memcg, int nr_pages);
 extern struct cftype memsw_files[];
 extern struct cftype mem_cgroup_legacy_files[];
 
@@ -125,6 +126,7 @@ static inline void memcg1_check_events(struct mem_cgroup *memcg, int nid) {}
 
 static inline void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s) {}
 
+static inline void memcg1_account_kmem(struct mem_cgroup *memcg, int nr_pages) {}
 extern struct cftype memsw_files[];
 extern struct cftype mem_cgroup_legacy_files[];
 #endif	/* CONFIG_MEMCG_V1 */
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c251bbe35f4b..802a077e2e2f 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1718,7 +1718,6 @@ static DEFINE_MUTEX(percpu_charge_mutex);
 static struct obj_cgroup *drain_obj_stock(struct memcg_stock_pcp *stock);
 static bool obj_stock_flush_required(struct memcg_stock_pcp *stock,
 				     struct mem_cgroup *root_memcg);
-static void memcg_account_kmem(struct mem_cgroup *memcg, int nr_pages);
 
 #else
 static inline struct obj_cgroup *drain_obj_stock(struct memcg_stock_pcp *stock)
@@ -1730,9 +1729,6 @@ static bool obj_stock_flush_required(struct memcg_stock_pcp *stock,
 {
 	return false;
 }
-static void memcg_account_kmem(struct mem_cgroup *memcg, int nr_pages)
-{
-}
 #endif
 
 /**
@@ -2642,18 +2638,6 @@ struct obj_cgroup *get_obj_cgroup_from_folio(struct folio *folio)
 	return objcg;
 }
 
-static void memcg_account_kmem(struct mem_cgroup *memcg, int nr_pages)
-{
-	mod_memcg_state(memcg, MEMCG_KMEM, nr_pages);
-	if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) {
-		if (nr_pages > 0)
-			page_counter_charge(&memcg->kmem, nr_pages);
-		else
-			page_counter_uncharge(&memcg->kmem, -nr_pages);
-	}
-}
-
-
 /*
  * obj_cgroup_uncharge_pages: uncharge a number of kernel pages from a objcg
  * @objcg: object cgroup to uncharge
@@ -2666,7 +2650,8 @@ static void obj_cgroup_uncharge_pages(struct obj_cgroup *objcg,
 
 	memcg = get_mem_cgroup_from_objcg(objcg);
 
-	memcg_account_kmem(memcg, -nr_pages);
+	mod_memcg_state(memcg, MEMCG_KMEM, -nr_pages);
+	memcg1_account_kmem(memcg, -nr_pages);
 	refill_stock(memcg, nr_pages);
 
 	css_put(&memcg->css);
@@ -2692,7 +2677,8 @@ static int obj_cgroup_charge_pages(struct obj_cgroup *objcg, gfp_t gfp,
 	if (ret)
 		goto out;
 
-	memcg_account_kmem(memcg, nr_pages);
+	mod_memcg_state(memcg, MEMCG_KMEM, nr_pages);
+	memcg1_account_kmem(memcg, nr_pages);
 out:
 	css_put(&memcg->css);
 
@@ -2845,7 +2831,8 @@ static struct obj_cgroup *drain_obj_stock(struct memcg_stock_pcp *stock)
 
 			memcg = get_mem_cgroup_from_objcg(old);
 
-			memcg_account_kmem(memcg, -nr_pages);
+			mod_memcg_state(memcg, MEMCG_KMEM, -nr_pages);
+			memcg1_account_kmem(memcg, -nr_pages);
 			__refill_stock(memcg, nr_pages);
 
 			css_put(&memcg->css);
@@ -4806,8 +4793,10 @@ static void uncharge_batch(const struct uncharge_gather *ug)
 		page_counter_uncharge(&ug->memcg->memory, ug->nr_memory);
 		if (do_memsw_account())
 			page_counter_uncharge(&ug->memcg->memsw, ug->nr_memory);
-		if (ug->nr_kmem)
-			memcg_account_kmem(ug->memcg, -ug->nr_kmem);
+		if (ug->nr_kmem) {
+			mod_memcg_state(ug->memcg, MEMCG_KMEM, -ug->nr_kmem);
+			memcg1_account_kmem(ug->memcg, -ug->nr_kmem);
+		}
 		memcg1_oom_recover(ug->memcg);
 	}
 
-- 
2.45.2.803.g4e1b14247a-goog