linux-kernel - [PATCH v5 37/45] zsmalloc: dynamically allocate the mm-zspool shrinker

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Message-Id: <20230824034304.37411-38-zhengqi.arch@bytedance.com>
Date:   Thu, 24 Aug 2023 11:42:56 +0800
From:   Qi Zheng <zhengqi.arch@...edance.com>
To:     akpm@...ux-foundation.org, david@...morbit.com, tkhai@...ru,
        vbabka@...e.cz, roman.gushchin@...ux.dev, djwong@...nel.org,
        brauner@...nel.org, paulmck@...nel.org, tytso@....edu,
        steven.price@....com, cel@...nel.org, senozhatsky@...omium.org,
        yujie.liu@...el.com, gregkh@...uxfoundation.org,
        muchun.song@...ux.dev
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org,
        Qi Zheng <zhengqi.arch@...edance.com>,
        Muchun Song <songmuchun@...edance.com>,
        Minchan Kim <minchan@...nel.org>
Subject: [PATCH v5 37/45] zsmalloc: dynamically allocate the mm-zspool shrinker

In preparation for implementing lockless slab shrink, use new APIs to
dynamically allocate the mm-zspool shrinker, so that it can be freed
asynchronously via RCU. Then it doesn't need to wait for RCU read-side
critical section when releasing the struct zs_pool.

Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
Reviewed-by: Muchun Song <songmuchun@...edance.com>
CC: Minchan Kim <minchan@...nel.org>
CC: Sergey Senozhatsky <senozhatsky@...omium.org>
---
 mm/zsmalloc.c | 28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index b58f957429f0..1909234bb345 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -229,7 +229,7 @@ struct zs_pool {
 	struct zs_pool_stats stats;
 
 	/* Compact classes */
-	struct shrinker shrinker;
+	struct shrinker *shrinker;
 
 #ifdef CONFIG_ZSMALLOC_STAT
 	struct dentry *stat_dentry;
@@ -2086,8 +2086,7 @@ static unsigned long zs_shrinker_scan(struct shrinker *shrinker,
 		struct shrink_control *sc)
 {
 	unsigned long pages_freed;
-	struct zs_pool *pool = container_of(shrinker, struct zs_pool,
-			shrinker);
+	struct zs_pool *pool = shrinker->private_data;
 
 	/*
 	 * Compact classes and calculate compaction delta.
@@ -2105,8 +2104,7 @@ static unsigned long zs_shrinker_count(struct shrinker *shrinker,
 	int i;
 	struct size_class *class;
 	unsigned long pages_to_free = 0;
-	struct zs_pool *pool = container_of(shrinker, struct zs_pool,
-			shrinker);
+	struct zs_pool *pool = shrinker->private_data;
 
 	for (i = ZS_SIZE_CLASSES - 1; i >= 0; i--) {
 		class = pool->size_class[i];
@@ -2121,18 +2119,24 @@ static unsigned long zs_shrinker_count(struct shrinker *shrinker,
 
 static void zs_unregister_shrinker(struct zs_pool *pool)
 {
-	unregister_shrinker(&pool->shrinker);
+	shrinker_free(pool->shrinker);
 }
 
 static int zs_register_shrinker(struct zs_pool *pool)
 {
-	pool->shrinker.scan_objects = zs_shrinker_scan;
-	pool->shrinker.count_objects = zs_shrinker_count;
-	pool->shrinker.batch = 0;
-	pool->shrinker.seeks = DEFAULT_SEEKS;
+	pool->shrinker = shrinker_alloc(0, "mm-zspool:%s", pool->name);
+	if (!pool->shrinker)
+		return -ENOMEM;
+
+	pool->shrinker->scan_objects = zs_shrinker_scan;
+	pool->shrinker->count_objects = zs_shrinker_count;
+	pool->shrinker->batch = 0;
+	pool->shrinker->seeks = DEFAULT_SEEKS;
+	pool->shrinker->private_data = pool;
 
-	return register_shrinker(&pool->shrinker, "mm-zspool:%s",
-				 pool->name);
+	shrinker_register(pool->shrinker);
+
+	return 0;
 }
 
 static int calculate_zspage_chain_size(int class_size)
-- 
2.30.2