linux-kernel - [PATCH v7 REBASED 10/17] list_lru: Pass dst_memcg argument to memcg_drain_list_lru

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Message-ID: <152931518976.28457.3042342901552911633.stgit@localhost.localdomain>
Date:   Mon, 18 Jun 2018 12:46:29 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     vdavydov.dev@...il.com, shakeelb@...gle.com,
        viro@...iv.linux.org.uk, hannes@...xchg.org, mhocko@...nel.org,
        tglx@...utronix.de, pombredanne@...b.com, stummala@...eaurora.org,
        gregkh@...uxfoundation.org, sfr@...b.auug.org.au, guro@...com,
        mka@...omium.org, penguin-kernel@...ove.SAKURA.ne.jp,
        chris@...is-wilson.co.uk, longman@...hat.com, minchan@...nel.org,
        ying.huang@...el.com, mgorman@...hsingularity.net, jbacik@...com,
        linux@...ck-us.net, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, willy@...radead.org, lirongqing@...du.com,
        aryabinin@...tuozzo.com
Subject: [PATCH v7 REBASED 10/17] list_lru: Pass dst_memcg argument to
 memcg_drain_list_lru_node()

This is just refactoring to allow next patches to have
dst_memcg pointer in memcg_drain_list_lru_node().

Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
Acked-by: Vladimir Davydov <vdavydov.dev@...il.com>
Tested-by: Shakeel Butt <shakeelb@...gle.com>
---
 include/linux/list_lru.h |    2 +-
 mm/list_lru.c            |   11 ++++++-----
 mm/memcontrol.c          |    2 +-
 3 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/include/linux/list_lru.h b/include/linux/list_lru.h
index 9e75bb33766b..d9c16f2f2f00 100644
--- a/include/linux/list_lru.h
+++ b/include/linux/list_lru.h
@@ -69,7 +69,7 @@ int __list_lru_init(struct list_lru *lru, bool memcg_aware,
 	__list_lru_init((lru), true, NULL, shrinker)
 
 int memcg_update_all_list_lrus(int num_memcgs);
-void memcg_drain_all_list_lrus(int src_idx, int dst_idx);
+void memcg_drain_all_list_lrus(int src_idx, struct mem_cgroup *dst_memcg);
 
 /**
  * list_lru_add: add an element to the lru list's tail
diff --git a/mm/list_lru.c b/mm/list_lru.c
index 55a76465f7a2..a66d13b16046 100644
--- a/mm/list_lru.c
+++ b/mm/list_lru.c
@@ -508,8 +508,9 @@ int memcg_update_all_list_lrus(int new_size)
 }
 
 static void memcg_drain_list_lru_node(struct list_lru_node *nlru,
-				      int src_idx, int dst_idx)
+				      int src_idx, struct mem_cgroup *dst_memcg)
 {
+	int dst_idx = dst_memcg->kmemcg_id;
 	struct list_lru_one *src, *dst;
 
 	/*
@@ -529,7 +530,7 @@ static void memcg_drain_list_lru_node(struct list_lru_node *nlru,
 }
 
 static void memcg_drain_list_lru(struct list_lru *lru,
-				 int src_idx, int dst_idx)
+				 int src_idx, struct mem_cgroup *dst_memcg)
 {
 	int i;
 
@@ -537,16 +538,16 @@ static void memcg_drain_list_lru(struct list_lru *lru,
 		return;
 
 	for_each_node(i)
-		memcg_drain_list_lru_node(&lru->node[i], src_idx, dst_idx);
+		memcg_drain_list_lru_node(&lru->node[i], src_idx, dst_memcg);
 }
 
-void memcg_drain_all_list_lrus(int src_idx, int dst_idx)
+void memcg_drain_all_list_lrus(int src_idx, struct mem_cgroup *dst_memcg)
 {
 	struct list_lru *lru;
 
 	mutex_lock(&list_lrus_mutex);
 	list_for_each_entry(lru, &list_lrus, list)
-		memcg_drain_list_lru(lru, src_idx, dst_idx);
+		memcg_drain_list_lru(lru, src_idx, dst_memcg);
 	mutex_unlock(&list_lrus_mutex);
 }
 #else
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f80a2d1cd880..2b703c4130bb 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2965,7 +2965,7 @@ static void memcg_offline_kmem(struct mem_cgroup *memcg)
 	}
 	rcu_read_unlock();
 
-	memcg_drain_all_list_lrus(kmemcg_id, parent->kmemcg_id);
+	memcg_drain_all_list_lrus(kmemcg_id, parent);
 
 	memcg_free_cache_id(kmemcg_id);
 }