From: Yang Shi <shy828301@gmail.com>
To: guro@fb.com, ktkhai@virtuozzo.com, vbabka@suse.cz,
shakeelb@google.com, david@fromorbit.com, hannes@cmpxchg.org,
mhocko@suse.com, akpm@linux-foundation.org
Cc: shy828301@gmail.com, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [v10 PATCH 04/13] mm: vmscan: remove memcg_shrinker_map_size
Date: Thu, 11 Mar 2021 11:08:36 -0800 [thread overview]
Message-ID: <20210311190845.9708-5-shy828301@gmail.com> (raw)
In-Reply-To: <20210311190845.9708-1-shy828301@gmail.com>
Both memcg_shrinker_map_size and shrinker_nr_max is maintained, but actually the
map size can be calculated via shrinker_nr_max, so it seems unnecessary to keep both.
Remove memcg_shrinker_map_size since shrinker_nr_max is also used by iterating the
bit map.
Acked-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Acked-by: Roman Gushchin <guro@fb.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Yang Shi <shy828301@gmail.com>
---
mm/vmscan.c | 20 +++++++++++---------
1 file changed, 11 insertions(+), 9 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index b08c8d9055ae..641a0b8b4ea9 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -185,8 +185,12 @@ static LIST_HEAD(shrinker_list);
static DECLARE_RWSEM(shrinker_rwsem);
#ifdef CONFIG_MEMCG
+static int shrinker_nr_max;
-static int memcg_shrinker_map_size;
+static inline int shrinker_map_size(int nr_items)
+{
+ return (DIV_ROUND_UP(nr_items, BITS_PER_LONG) * sizeof(unsigned long));
+}
static void free_shrinker_map_rcu(struct rcu_head *head)
{
@@ -248,7 +252,7 @@ int alloc_shrinker_maps(struct mem_cgroup *memcg)
return 0;
down_write(&shrinker_rwsem);
- size = memcg_shrinker_map_size;
+ size = shrinker_map_size(shrinker_nr_max);
for_each_node(nid) {
map = kvzalloc_node(sizeof(*map) + size, GFP_KERNEL, nid);
if (!map) {
@@ -266,12 +270,13 @@ int alloc_shrinker_maps(struct mem_cgroup *memcg)
static int expand_shrinker_maps(int new_id)
{
int size, old_size, ret = 0;
+ int new_nr_max = new_id + 1;
struct mem_cgroup *memcg;
- size = DIV_ROUND_UP(new_id + 1, BITS_PER_LONG) * sizeof(unsigned long);
- old_size = memcg_shrinker_map_size;
+ size = shrinker_map_size(new_nr_max);
+ old_size = shrinker_map_size(shrinker_nr_max);
if (size <= old_size)
- return 0;
+ goto out;
if (!root_mem_cgroup)
goto out;
@@ -290,7 +295,7 @@ static int expand_shrinker_maps(int new_id)
} while ((memcg = mem_cgroup_iter(NULL, memcg, NULL)) != NULL);
out:
if (!ret)
- memcg_shrinker_map_size = size;
+ shrinker_nr_max = new_nr_max;
return ret;
}
@@ -323,7 +328,6 @@ void set_shrinker_bit(struct mem_cgroup *memcg, int nid, int shrinker_id)
#define SHRINKER_REGISTERING ((struct shrinker *)~0UL)
static DEFINE_IDR(shrinker_idr);
-static int shrinker_nr_max;
static int prealloc_memcg_shrinker(struct shrinker *shrinker)
{
@@ -340,8 +344,6 @@ static int prealloc_memcg_shrinker(struct shrinker *shrinker)
idr_remove(&shrinker_idr, id);
goto unlock;
}
-
- shrinker_nr_max = id + 1;
}
shrinker->id = id;
ret = 0;
--
2.26.2
next prev parent reply other threads:[~2021-03-11 19:10 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-11 19:08 [v10 PATCH 00/13] Make shrinker's nr_deferred memcg aware Yang Shi
2021-03-11 19:08 ` [v10 PATCH 01/13] mm: vmscan: use nid from shrink_control for tracepoint Yang Shi
2021-03-11 19:08 ` [v10 PATCH 02/13] mm: vmscan: consolidate shrinker_maps handling code Yang Shi
2021-03-11 19:08 ` [v10 PATCH 03/13] mm: vmscan: use shrinker_rwsem to protect shrinker_maps allocation Yang Shi
2021-03-11 19:08 ` Yang Shi [this message]
2021-03-11 19:08 ` [v10 PATCH 05/13] mm: vmscan: use kvfree_rcu instead of call_rcu Yang Shi
2021-03-11 19:08 ` [v10 PATCH 06/13] mm: memcontrol: rename shrinker_map to shrinker_info Yang Shi
2021-03-11 19:08 ` [v10 PATCH 07/13] mm: vmscan: add shrinker_info_protected() helper Yang Shi
2021-03-11 19:08 ` [v10 PATCH 08/13] mm: vmscan: use a new flag to indicate shrinker is registered Yang Shi
2021-03-11 19:08 ` [v10 PATCH 09/13] mm: vmscan: add per memcg shrinker nr_deferred Yang Shi
2021-03-11 19:08 ` [v10 PATCH 10/13] mm: vmscan: use per memcg nr_deferred of shrinker Yang Shi
2021-03-11 19:08 ` [v10 PATCH 11/13] mm: vmscan: don't need allocate shrinker->nr_deferred for memcg aware shrinkers Yang Shi
2021-03-11 19:08 ` [v10 PATCH 12/13] mm: memcontrol: reparent nr_deferred when memcg offline Yang Shi
2021-03-11 19:08 ` [v10 PATCH 13/13] mm: vmscan: shrink deferred objects proportional to priority Yang Shi
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