[PATCH 20/29] zsmalloc: dynamically allocate the mm-zspool shrinker
From: Qi Zheng <hidden>
Date: 2023-06-22 09:03:02
Also in:
dm-devel, dri-devel, intel-gfx, linux-arm-msm, linux-bcache, linux-btrfs, linux-ext4, linux-fsdevel, linux-mm, linux-nfs, linux-xfs, lkml
Subsystem:
memory management, the rest, zsmalloc compressed slab memory allocator · Maintainers:
Andrew Morton, Linus Torvalds, Minchan Kim, Sergey Senozhatsky
In preparation for implementing lockless slab shrink, we need to dynamically allocate the mm-zspool shrinker, so that it can be freed asynchronously using kfree_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 <redacted> --- mm/zsmalloc.c | 28 ++++++++++++++++------------ 1 file changed, 16 insertions(+), 12 deletions(-)
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 3f057970504e..c03b34ae637e 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;
@@ -2107,8 +2107,7 @@ 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.
@@ -2126,8 +2125,7 @@ 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];
@@ -2142,18 +2140,24 @@ static unsigned long zs_shrinker_count(struct shrinker *shrinker, static void zs_unregister_shrinker(struct zs_pool *pool) { - unregister_shrinker(&pool->shrinker); + unregister_and_free_shrinker(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; + int ret; + + pool->shrinker = shrinker_alloc_and_init(zs_shrinker_count, + zs_shrinker_scan, 0, + DEFAULT_SEEKS, 0, pool); + if (!pool->shrinker) + return -ENOMEM; - return register_shrinker(&pool->shrinker, "mm-zspool:%s", - pool->name); + ret = register_shrinker(pool->shrinker, "mm-zspool:%s", pool->name); + if (ret) + shrinker_free(pool->shrinker); + + return ret; } static int calculate_zspage_chain_size(int class_size)
--
2.30.2