linux-kernel - [PATCH] mm: Allocate shrinker

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Date:   Fri, 31 Jan 2020 15:09:32 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     akpm@...ux-foundation.org, mhocko@...nel.org, hannes@...xchg.org,
        shakeelb@...gle.com, vdavydov.dev@...il.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, ktkhai@...tuozzo.com
Subject: [PATCH] mm: Allocate shrinker_map on appropriate NUMA node

Despite shrinker_map may be touched from any cpu
(e.g., a bit there may be set by a task running
everywhere); kswapd is always bound to specific
node. So, we will allocate shrinker_map from
related NUMA node to respect its NUMA locality.
Also, this follows generic way we use for allocation
memcg's per-node data.

Two hunks node_state() patterns are borrowed from
alloc_mem_cgroup_per_node_info().

Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
---
 mm/memcontrol.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6f6dc8712e39..8ccc8ceb1b17 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -323,7 +323,7 @@ static int memcg_expand_one_shrinker_map(struct mem_cgroup *memcg,
 					 int size, int old_size)
 {
 	struct memcg_shrinker_map *new, *old;
-	int nid;
+	int nid, tmp;
 
 	lockdep_assert_held(&memcg_shrinker_map_mutex);
 
@@ -333,8 +333,9 @@ static int memcg_expand_one_shrinker_map(struct mem_cgroup *memcg,
 		/* Not yet online memcg */
 		if (!old)
 			return 0;
-
-		new = kvmalloc(sizeof(*new) + size, GFP_KERNEL);
+		/* See comment in alloc_mem_cgroup_per_node_info()*/
+		tmp = node_state(nid, N_NORMAL_MEMORY) ? nid : - 1;
+		new = kvmalloc_node(sizeof(*new) + size, GFP_KERNEL, tmp);
 		if (!new)
 			return -ENOMEM;
 
@@ -370,7 +371,7 @@ static void memcg_free_shrinker_maps(struct mem_cgroup *memcg)
 static int memcg_alloc_shrinker_maps(struct mem_cgroup *memcg)
 {
 	struct memcg_shrinker_map *map;
-	int nid, size, ret = 0;
+	int nid, size, tmp, ret = 0;
 
 	if (mem_cgroup_is_root(memcg))
 		return 0;
@@ -378,7 +379,9 @@ static int memcg_alloc_shrinker_maps(struct mem_cgroup *memcg)
 	mutex_lock(&memcg_shrinker_map_mutex);
 	size = memcg_shrinker_map_size;
 	for_each_node(nid) {
-		map = kvzalloc(sizeof(*map) + size, GFP_KERNEL);
+		/* See comment in alloc_mem_cgroup_per_node_info()*/
+		tmp = node_state(nid, N_NORMAL_MEMORY) ? nid : - 1;
+		map = kvzalloc_node(sizeof(*map) + size, GFP_KERNEL, tmp);
 		if (!map) {
 			memcg_free_shrinker_maps(memcg);
 			ret = -ENOMEM;