[PATCH rfc 5/5] mm: provide shrinkers with names

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Currently shrinkers are anonymous objects. For debugging purposes they
can be identified by count/scan function names, but it's not always
useful: e.g. for superblock's shrinkers it's nice to have at least
an idea of to which superblock the shrinker belongs.

This commit adds names to shrinkers. register_shrinker() and
prealloc_shrinker() functions are extended to take a format and
arguments to master a name. If CONFIG_SHRINKER_DEBUG is on,
the name is saved until the corresponding kobject is created,
otherwise it's simple ignored.

After this change the shrinker sysfs folder looks like:
  $ cd /sys/kernel/shrinker/
  $ ls
    dqcache-16          sb-cgroup2-30    sb-hugetlbfs-33  sb-proc-41       sb-selinuxfs-22  sb-tmpfs-40    sb-zsmalloc-19
    kfree_rcu-0         sb-configfs-23   sb-iomem-12      sb-proc-44       sb-sockfs-8      sb-tmpfs-42    shadow-18
    sb-aio-20           sb-dax-11        sb-mqueue-21     sb-proc-45       sb-sysfs-26      sb-tmpfs-43    thp_deferred_split-10
    sb-anon_inodefs-15  sb-debugfs-7     sb-nsfs-4        sb-proc-47       sb-tmpfs-1       sb-tmpfs-46    thp_zero-9
    sb-bdev-3           sb-devpts-28     sb-pipefs-14     sb-pstore-31     sb-tmpfs-27      sb-tmpfs-49    xfs_buf-37
    sb-bpf-32           sb-devtmpfs-5    sb-proc-25       sb-rootfs-2      sb-tmpfs-29      sb-tracefs-13  xfs_inodegc-38
    sb-btrfs-24         sb-hugetlbfs-17  sb-proc-39       sb-securityfs-6  sb-tmpfs-35      sb-xfs-36      zspool-34

Signed-off-by: Roman Gushchin <roman.gushchin@xxxxxxxxx>
---
 arch/x86/kvm/mmu/mmu.c                        |  2 +-
 drivers/android/binder_alloc.c                |  2 +-
 drivers/gpu/drm/i915/gem/i915_gem_shrinker.c  |  3 +-
 drivers/gpu/drm/msm/msm_gem_shrinker.c        |  2 +-
 .../gpu/drm/panfrost/panfrost_gem_shrinker.c  |  2 +-
 drivers/gpu/drm/ttm/ttm_pool.c                |  2 +-
 drivers/md/bcache/btree.c                     |  2 +-
 drivers/md/dm-bufio.c                         |  2 +-
 drivers/md/dm-zoned-metadata.c                |  2 +-
 drivers/md/raid5.c                            |  2 +-
 drivers/misc/vmw_balloon.c                    |  2 +-
 drivers/virtio/virtio_balloon.c               |  2 +-
 drivers/xen/xenbus/xenbus_probe_backend.c     |  2 +-
 fs/erofs/utils.c                              |  2 +-
 fs/ext4/extents_status.c                      |  3 +-
 fs/f2fs/super.c                               |  2 +-
 fs/gfs2/glock.c                               |  2 +-
 fs/gfs2/main.c                                |  2 +-
 fs/jbd2/journal.c                             |  2 +-
 fs/mbcache.c                                  |  2 +-
 fs/nfs/nfs42xattr.c                           |  7 ++-
 fs/nfs/super.c                                |  2 +-
 fs/nfsd/filecache.c                           |  2 +-
 fs/nfsd/nfscache.c                            |  2 +-
 fs/quota/dquot.c                              |  2 +-
 fs/super.c                                    |  2 +-
 fs/ubifs/super.c                              |  2 +-
 fs/xfs/xfs_buf.c                              |  2 +-
 fs/xfs/xfs_icache.c                           |  2 +-
 fs/xfs/xfs_qm.c                               |  2 +-
 include/linux/shrinker.h                      |  5 +-
 kernel/rcu/tree.c                             |  2 +-
 mm/huge_memory.c                              |  4 +-
 mm/shrinker_debug.c                           |  7 ++-
 mm/vmscan.c                                   | 60 ++++++++++++++++++-
 mm/workingset.c                               |  2 +-
 mm/zsmalloc.c                                 |  2 +-
 net/sunrpc/auth.c                             |  2 +-
 38 files changed, 105 insertions(+), 46 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index f9080ee50ffa..7f3abc800621 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -6283,7 +6283,7 @@ int kvm_mmu_vendor_module_init(void)
 	if (percpu_counter_init(&kvm_total_used_mmu_pages, 0, GFP_KERNEL))
 		goto out;
 
-	ret = register_shrinker(&mmu_shrinker);
+	ret = register_shrinker(&mmu_shrinker, "mmu");
 	if (ret)
 		goto out;
 
diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index 2ac1008a5f39..951343c41ba8 100644
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -1084,7 +1084,7 @@ int binder_alloc_shrinker_init(void)
 	int ret = list_lru_init(&binder_alloc_lru);
 
 	if (ret == 0) {
-		ret = register_shrinker(&binder_shrinker);
+		ret = register_shrinker(&binder_shrinker, "binder");
 		if (ret)
 			list_lru_destroy(&binder_alloc_lru);
 	}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c b/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
index 6a6ff98a8746..85524ef92ea4 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
@@ -426,7 +426,8 @@ void i915_gem_driver_register__shrinker(struct drm_i915_private *i915)
 	i915->mm.shrinker.count_objects = i915_gem_shrinker_count;
 	i915->mm.shrinker.seeks = DEFAULT_SEEKS;
 	i915->mm.shrinker.batch = 4096;
-	drm_WARN_ON(&i915->drm, register_shrinker(&i915->mm.shrinker));
+	drm_WARN_ON(&i915->drm, register_shrinker(&i915->mm.shrinker,
+						  "drm_i915_gem"));
 
 	i915->mm.oom_notifier.notifier_call = i915_gem_shrinker_oom;
 	drm_WARN_ON(&i915->drm, register_oom_notifier(&i915->mm.oom_notifier));
diff --git a/drivers/gpu/drm/msm/msm_gem_shrinker.c b/drivers/gpu/drm/msm/msm_gem_shrinker.c
index 086dacf2f26a..2d3cf4f13dfd 100644
--- a/drivers/gpu/drm/msm/msm_gem_shrinker.c
+++ b/drivers/gpu/drm/msm/msm_gem_shrinker.c
@@ -221,7 +221,7 @@ void msm_gem_shrinker_init(struct drm_device *dev)
 	priv->shrinker.count_objects = msm_gem_shrinker_count;
 	priv->shrinker.scan_objects = msm_gem_shrinker_scan;
 	priv->shrinker.seeks = DEFAULT_SEEKS;
-	WARN_ON(register_shrinker(&priv->shrinker));
+	WARN_ON(register_shrinker(&priv->shrinker, "drm_msm_gem"));
 
 	priv->vmap_notifier.notifier_call = msm_gem_shrinker_vmap;
 	WARN_ON(register_vmap_purge_notifier(&priv->vmap_notifier));
diff --git a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c b/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
index 77e7cb6d1ae3..0d028266ee9e 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
@@ -103,7 +103,7 @@ void panfrost_gem_shrinker_init(struct drm_device *dev)
 	pfdev->shrinker.count_objects = panfrost_gem_shrinker_count;
 	pfdev->shrinker.scan_objects = panfrost_gem_shrinker_scan;
 	pfdev->shrinker.seeks = DEFAULT_SEEKS;
-	WARN_ON(register_shrinker(&pfdev->shrinker));
+	WARN_ON(register_shrinker(&pfdev->shrinker, "drm_panfrost"));
 }
 
 /**
diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index 1bba0a0ed3f9..b8b41d242197 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -722,7 +722,7 @@ int ttm_pool_mgr_init(unsigned long num_pages)
 	mm_shrinker.count_objects = ttm_pool_shrinker_count;
 	mm_shrinker.scan_objects = ttm_pool_shrinker_scan;
 	mm_shrinker.seeks = 1;
-	return register_shrinker(&mm_shrinker);
+	return register_shrinker(&mm_shrinker, "drm_ttm_pool");
 }
 
 /**
diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index ad9f16689419..c1f734ab86b3 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -812,7 +812,7 @@ int bch_btree_cache_alloc(struct cache_set *c)
 	c->shrink.seeks = 4;
 	c->shrink.batch = c->btree_pages * 2;
 
-	if (register_shrinker(&c->shrink))
+	if (register_shrinker(&c->shrink, "btree"))
 		pr_warn("bcache: %s: could not register shrinker\n",
 				__func__);
 
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index e9cbc70d5a0e..2a2255dc507f 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -1807,7 +1807,7 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign
 	c->shrinker.scan_objects = dm_bufio_shrink_scan;
 	c->shrinker.seeks = 1;
 	c->shrinker.batch = 0;
-	r = register_shrinker(&c->shrinker);
+	r = register_shrinker(&c->shrinker, "dm_bufio");
 	if (r)
 		goto bad;
 
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index d1ea66114d14..05f2fd12066b 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -2944,7 +2944,7 @@ int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev,
 	zmd->mblk_shrinker.seeks = DEFAULT_SEEKS;
 
 	/* Metadata cache shrinker */
-	ret = register_shrinker(&zmd->mblk_shrinker);
+	ret = register_shrinker(&zmd->mblk_shrinker, "md_meta");
 	if (ret) {
 		dmz_zmd_err(zmd, "Register metadata cache shrinker failed");
 		goto err;
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 351d341a1ffa..7a2ee351b67f 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -7383,7 +7383,7 @@ static struct r5conf *setup_conf(struct mddev *mddev)
 	conf->shrinker.count_objects = raid5_cache_count;
 	conf->shrinker.batch = 128;
 	conf->shrinker.flags = 0;
-	if (register_shrinker(&conf->shrinker)) {
+	if (register_shrinker(&conf->shrinker, "md")) {
 		pr_warn("md/raid:%s: couldn't register shrinker.\n",
 			mdname(mddev));
 		goto abort;
diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
index f1d8ba6d4857..6c9ddf1187dd 100644
--- a/drivers/misc/vmw_balloon.c
+++ b/drivers/misc/vmw_balloon.c
@@ -1587,7 +1587,7 @@ static int vmballoon_register_shrinker(struct vmballoon *b)
 	b->shrinker.count_objects = vmballoon_shrinker_count;
 	b->shrinker.seeks = DEFAULT_SEEKS;
 
-	r = register_shrinker(&b->shrinker);
+	r = register_shrinker(&b->shrinker, "vmw_balloon");
 
 	if (r == 0)
 		b->shrinker_registered = true;
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index f4c34a2a6b8e..093e06e19d0e 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -875,7 +875,7 @@ static int virtio_balloon_register_shrinker(struct virtio_balloon *vb)
 	vb->shrinker.count_objects = virtio_balloon_shrinker_count;
 	vb->shrinker.seeks = DEFAULT_SEEKS;
 
-	return register_shrinker(&vb->shrinker);
+	return register_shrinker(&vb->shrinker, "virtio_valloon");
 }
 
 static int virtballoon_probe(struct virtio_device *vdev)
diff --git a/drivers/xen/xenbus/xenbus_probe_backend.c b/drivers/xen/xenbus/xenbus_probe_backend.c
index 5abded97e1a7..a6c5e344017d 100644
--- a/drivers/xen/xenbus/xenbus_probe_backend.c
+++ b/drivers/xen/xenbus/xenbus_probe_backend.c
@@ -305,7 +305,7 @@ static int __init xenbus_probe_backend_init(void)
 
 	register_xenstore_notifier(&xenstore_notifier);
 
-	if (register_shrinker(&backend_memory_shrinker))
+	if (register_shrinker(&backend_memory_shrinker, "xen_backend"))
 		pr_warn("shrinker registration failed\n");
 
 	return 0;
diff --git a/fs/erofs/utils.c b/fs/erofs/utils.c
index ec9a1d780dc1..67eb64fadd4f 100644
--- a/fs/erofs/utils.c
+++ b/fs/erofs/utils.c
@@ -282,7 +282,7 @@ static struct shrinker erofs_shrinker_info = {
 
 int __init erofs_init_shrinker(void)
 {
-	return register_shrinker(&erofs_shrinker_info);
+	return register_shrinker(&erofs_shrinker_info, "erofs");
 }
 
 void erofs_exit_shrinker(void)
diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c
index 9a3a8996aacf..a7aa79d580e5 100644
--- a/fs/ext4/extents_status.c
+++ b/fs/ext4/extents_status.c
@@ -1650,11 +1650,10 @@ int ext4_es_register_shrinker(struct ext4_sb_info *sbi)
 	err = percpu_counter_init(&sbi->s_es_stats.es_stats_shk_cnt, 0, GFP_KERNEL);
 	if (err)
 		goto err3;
-
 	sbi->s_es_shrinker.scan_objects = ext4_es_scan;
 	sbi->s_es_shrinker.count_objects = ext4_es_count;
 	sbi->s_es_shrinker.seeks = DEFAULT_SEEKS;
-	err = register_shrinker(&sbi->s_es_shrinker);
+	err = register_shrinker(&sbi->s_es_shrinker, "ext4_es");
 	if (err)
 		goto err4;
 
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index ea939db18f88..ffce794bd4f6 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -4609,7 +4609,7 @@ static int __init init_f2fs_fs(void)
 	err = f2fs_init_sysfs();
 	if (err)
 		goto free_garbage_collection_cache;
-	err = register_shrinker(&f2fs_shrinker_info);
+	err = register_shrinker(&f2fs_shrinker_info, "f2fs");
 	if (err)
 		goto free_sysfs;
 	err = register_filesystem(&f2fs_fs_type);
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 26169cedcefc..791c23d9f7e7 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -2549,7 +2549,7 @@ int __init gfs2_glock_init(void)
 		return -ENOMEM;
 	}
 
-	ret = register_shrinker(&glock_shrinker);
+	ret = register_shrinker(&glock_shrinker, "gfs2_glock");
 	if (ret) {
 		destroy_workqueue(gfs2_delete_workqueue);
 		destroy_workqueue(glock_workqueue);
diff --git a/fs/gfs2/main.c b/fs/gfs2/main.c
index 28d0eb23e18e..dde981b78488 100644
--- a/fs/gfs2/main.c
+++ b/fs/gfs2/main.c
@@ -150,7 +150,7 @@ static int __init init_gfs2_fs(void)
 	if (!gfs2_trans_cachep)
 		goto fail_cachep8;
 
-	error = register_shrinker(&gfs2_qd_shrinker);
+	error = register_shrinker(&gfs2_qd_shrinker, "gfs2_qd");
 	if (error)
 		goto fail_shrinker;
 
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index fcacafa4510d..271f418d3dc3 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1418,7 +1418,7 @@ static journal_t *journal_init_common(struct block_device *bdev,
 	if (percpu_counter_init(&journal->j_checkpoint_jh_count, 0, GFP_KERNEL))
 		goto err_cleanup;
 
-	if (register_shrinker(&journal->j_shrinker)) {
+	if (register_shrinker(&journal->j_shrinker, "jbd2_journal")) {
 		percpu_counter_destroy(&journal->j_checkpoint_jh_count);
 		goto err_cleanup;
 	}
diff --git a/fs/mbcache.c b/fs/mbcache.c
index 97c54d3a2227..379dc5b0b6ad 100644
--- a/fs/mbcache.c
+++ b/fs/mbcache.c
@@ -367,7 +367,7 @@ struct mb_cache *mb_cache_create(int bucket_bits)
 	cache->c_shrink.count_objects = mb_cache_count;
 	cache->c_shrink.scan_objects = mb_cache_scan;
 	cache->c_shrink.seeks = DEFAULT_SEEKS;
-	if (register_shrinker(&cache->c_shrink)) {
+	if (register_shrinker(&cache->c_shrink, "mb_cache")) {
 		kfree(cache->c_hash);
 		kfree(cache);
 		goto err_out;
diff --git a/fs/nfs/nfs42xattr.c b/fs/nfs/nfs42xattr.c
index e7b34f7e0614..147b8a2f2dc6 100644
--- a/fs/nfs/nfs42xattr.c
+++ b/fs/nfs/nfs42xattr.c
@@ -1017,15 +1017,16 @@ int __init nfs4_xattr_cache_init(void)
 	if (ret)
 		goto out2;
 
-	ret = register_shrinker(&nfs4_xattr_cache_shrinker);
+	ret = register_shrinker(&nfs4_xattr_cache_shrinker, "nfs_xattr_cache");
 	if (ret)
 		goto out1;
 
-	ret = register_shrinker(&nfs4_xattr_entry_shrinker);
+	ret = register_shrinker(&nfs4_xattr_entry_shrinker, "nfs_xattr_entry");
 	if (ret)
 		goto out;
 
-	ret = register_shrinker(&nfs4_xattr_large_entry_shrinker);
+	ret = register_shrinker(&nfs4_xattr_large_entry_shrinker,
+				"nfs_xattr_large_entry");
 	if (!ret)
 		return 0;
 
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 6ab5eeb000dc..c7a2aef911f1 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -149,7 +149,7 @@ int __init register_nfs_fs(void)
 	ret = nfs_register_sysctl();
 	if (ret < 0)
 		goto error_2;
-	ret = register_shrinker(&acl_shrinker);
+	ret = register_shrinker(&acl_shrinker, "nfs_acl");
 	if (ret < 0)
 		goto error_3;
 #ifdef CONFIG_NFS_V4_2
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 2c1b027774d4..9c2879a3c3c0 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -666,7 +666,7 @@ nfsd_file_cache_init(void)
 		goto out_err;
 	}
 
-	ret = register_shrinker(&nfsd_file_shrinker);
+	ret = register_shrinker(&nfsd_file_shrinker, "nfsd_filecache");
 	if (ret) {
 		pr_err("nfsd: failed to register nfsd_file_shrinker: %d\n", ret);
 		goto out_lru;
diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index 0b3f12aa37ff..f1cfb06d0be5 100644
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -176,7 +176,7 @@ int nfsd_reply_cache_init(struct nfsd_net *nn)
 	nn->nfsd_reply_cache_shrinker.scan_objects = nfsd_reply_cache_scan;
 	nn->nfsd_reply_cache_shrinker.count_objects = nfsd_reply_cache_count;
 	nn->nfsd_reply_cache_shrinker.seeks = 1;
-	status = register_shrinker(&nn->nfsd_reply_cache_shrinker);
+	status = register_shrinker(&nn->nfsd_reply_cache_shrinker, "nfsd_reply");
 	if (status)
 		goto out_stats_destroy;
 
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index a74aef99bd3d..854d2b1d0914 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -2985,7 +2985,7 @@ static int __init dquot_init(void)
 	pr_info("VFS: Dquot-cache hash table entries: %ld (order %ld,"
 		" %ld bytes)\n", nr_hash, order, (PAGE_SIZE << order));
 
-	if (register_shrinker(&dqcache_shrinker))
+	if (register_shrinker(&dqcache_shrinker, "dqcache"))
 		panic("Cannot register dquot shrinker");
 
 	return 0;
diff --git a/fs/super.c b/fs/super.c
index f1d4a193602d..8983c264cfc6 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -265,7 +265,7 @@ static struct super_block *alloc_super(struct file_system_type *type, int flags,
 	s->s_shrink.count_objects = super_cache_count;
 	s->s_shrink.batch = 1024;
 	s->s_shrink.flags = SHRINKER_NUMA_AWARE | SHRINKER_MEMCG_AWARE;
-	if (prealloc_shrinker(&s->s_shrink))
+	if (prealloc_shrinker(&s->s_shrink, "sb-%s", type->name))
 		goto fail;
 	if (list_lru_init_memcg(&s->s_dentry_lru, &s->s_shrink))
 		goto fail;
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index bad67455215f..a3663d201f64 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -2430,7 +2430,7 @@ static int __init ubifs_init(void)
 	if (!ubifs_inode_slab)
 		return -ENOMEM;
 
-	err = register_shrinker(&ubifs_shrinker_info);
+	err = register_shrinker(&ubifs_shrinker_info, "ubifs");
 	if (err)
 		goto out_slab;
 
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index e1afb9e503e1..5645e92df0c9 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -1986,7 +1986,7 @@ xfs_alloc_buftarg(
 	btp->bt_shrinker.scan_objects = xfs_buftarg_shrink_scan;
 	btp->bt_shrinker.seeks = DEFAULT_SEEKS;
 	btp->bt_shrinker.flags = SHRINKER_NUMA_AWARE;
-	if (register_shrinker(&btp->bt_shrinker))
+	if (register_shrinker(&btp->bt_shrinker, "xfs_buf"))
 		goto error_pcpu;
 	return btp;
 
diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index bffd6eb0b298..d0c4e74ff763 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -2198,5 +2198,5 @@ xfs_inodegc_register_shrinker(
 	shrink->flags = SHRINKER_NONSLAB;
 	shrink->batch = XFS_INODEGC_SHRINKER_BATCH;
 
-	return register_shrinker(shrink);
+	return register_shrinker(shrink, "xfs_inodegc");
 }
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index f165d1a3de1d..93ded9e81f49 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -686,7 +686,7 @@ xfs_qm_init_quotainfo(
 	qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
 	qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
 
-	error = register_shrinker(&qinf->qi_shrinker);
+	error = register_shrinker(&qinf->qi_shrinker, "xfs_qm");
 	if (error)
 		goto out_free_inos;
 
diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h
index 50c0e233ecdd..8b683f141098 100644
--- a/include/linux/shrinker.h
+++ b/include/linux/shrinker.h
@@ -77,6 +77,7 @@ struct shrinker {
 #endif
 #ifdef CONFIG_SHRINKER_DEBUG
 	struct shrinker_kobj *kobj;
+	char *name;
 #endif
 	/* objs pending delete, per node */
 	atomic_long_t *nr_deferred;
@@ -93,9 +94,9 @@ struct shrinker {
  */
 #define SHRINKER_NONSLAB	(1 << 3)
 
-extern int prealloc_shrinker(struct shrinker *shrinker);
+extern int prealloc_shrinker(struct shrinker *shrinker, const char *fmt, ...);
 extern void register_shrinker_prepared(struct shrinker *shrinker);
-extern int register_shrinker(struct shrinker *shrinker);
+extern int register_shrinker(struct shrinker *shrinker, const char *fmt, ...);
 extern void unregister_shrinker(struct shrinker *shrinker);
 extern void free_prealloced_shrinker(struct shrinker *shrinker);
 extern void synchronize_shrinkers(void);
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 29d0fa150721..4cd5f9907f80 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -4874,7 +4874,7 @@ static void __init kfree_rcu_batch_init(void)
 		INIT_DELAYED_WORK(&krcp->page_cache_work, fill_page_cache_func);
 		krcp->initialized = true;
 	}
-	if (register_shrinker(&kfree_rcu_shrinker))
+	if (register_shrinker(&kfree_rcu_shrinker, "kfree_rcu"))
 		pr_err("Failed to register kfree_rcu() shrinker!\n");
 }
 
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 72683907c23c..eccaa3bbd467 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -423,10 +423,10 @@ static int __init hugepage_init(void)
 	if (err)
 		goto err_slab;
 
-	err = register_shrinker(&huge_zero_page_shrinker);
+	err = register_shrinker(&huge_zero_page_shrinker, "thp_zero");
 	if (err)
 		goto err_hzp_shrinker;
-	err = register_shrinker(&deferred_split_shrinker);
+	err = register_shrinker(&deferred_split_shrinker, "thp_deferred_split");
 	if (err)
 		goto err_split_shrinker;
 
diff --git a/mm/shrinker_debug.c b/mm/shrinker_debug.c
index ae6e434500bc..ce74d220bad3 100644
--- a/mm/shrinker_debug.c
+++ b/mm/shrinker_debug.c
@@ -738,14 +738,17 @@ int shrinker_init_kobj(struct shrinker *shrinker)
 	skobj->id = id;
 	skobj->kobj.kset = shrinker_kset;
 	skobj->shrinker = shrinker;
-	ret = kobject_init_and_add(&skobj->kobj, &shrinker_ktype, NULL, "%d",
-				   id);
+	ret = kobject_init_and_add(&skobj->kobj, &shrinker_ktype, NULL, "%s-%d",
+				   shrinker->name, id);
 	if (ret) {
 		ida_free(&shrinker_sysfs_ida, id);
 		kobject_put(&skobj->kobj);
 		return ret;
 	}
 
+	/* shrinker->name is not needed anymore, free it */
+	kfree(shrinker->name);
+	shrinker->name = NULL;
 	shrinker->kobj = skobj;
 
 	kobject_uevent(&skobj->kobj, KOBJ_ADD);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 79eaa9cea618..4b030c94f3c0 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -624,7 +624,7 @@ static unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru,
 /*
  * Add a shrinker callback to be called from the vm.
  */
-int prealloc_shrinker(struct shrinker *shrinker)
+static int __prealloc_shrinker(struct shrinker *shrinker)
 {
 	unsigned int size;
 	int err;
@@ -648,6 +648,34 @@ int prealloc_shrinker(struct shrinker *shrinker)
 	return 0;
 }
 
+#ifdef CONFIG_SHRINKER_DEBUG
+int prealloc_shrinker(struct shrinker *shrinker, const char *fmt, ...)
+{
+	int err;
+	char buf[64];
+	va_list ap;
+
+	va_start(ap, fmt);
+	vscnprintf(buf, sizeof(buf), fmt, ap);
+	va_end(ap);
+
+	shrinker->name = kstrdup(buf, GFP_KERNEL);
+	if (!shrinker->name)
+		return -ENOMEM;
+
+	err = __prealloc_shrinker(shrinker);
+	if (err)
+		kfree(shrinker->name);
+
+	return err;
+}
+#else
+int prealloc_shrinker(struct shrinker *shrinker, const char *fmt, ...)
+{
+	return __prealloc_shrinker(shrinker);
+}
+#endif
+
 void free_prealloced_shrinker(struct shrinker *shrinker)
 {
 	if (shrinker->flags & SHRINKER_MEMCG_AWARE) {
@@ -659,6 +687,9 @@ void free_prealloced_shrinker(struct shrinker *shrinker)
 
 	kfree(shrinker->nr_deferred);
 	shrinker->nr_deferred = NULL;
+#ifdef CONFIG_SHRINKER_DEBUG
+	kfree(shrinker->name);
+#endif
 }
 
 void register_shrinker_prepared(struct shrinker *shrinker)
@@ -670,15 +701,38 @@ void register_shrinker_prepared(struct shrinker *shrinker)
 	up_write(&shrinker_rwsem);
 }
 
-int register_shrinker(struct shrinker *shrinker)
+static int __register_shrinker(struct shrinker *shrinker)
 {
-	int err = prealloc_shrinker(shrinker);
+	int err = __prealloc_shrinker(shrinker);
 
 	if (err)
 		return err;
 	register_shrinker_prepared(shrinker);
 	return 0;
 }
+
+#ifdef CONFIG_SHRINKER_DEBUG
+int register_shrinker(struct shrinker *shrinker, const char *fmt, ...)
+{
+	char buf[64];
+	va_list ap;
+
+	va_start(ap, fmt);
+	vscnprintf(buf, sizeof(buf), fmt, ap);
+	va_end(ap);
+
+	shrinker->name = kstrdup(buf, GFP_KERNEL);
+	if (!shrinker->name)
+		return -ENOMEM;
+
+	return __register_shrinker(shrinker);
+}
+#else
+int register_shrinker(struct shrinker *shrinker, const char *fmt, ...)
+{
+	return __register_shrinker(shrinker);
+}
+#endif
 EXPORT_SYMBOL(register_shrinker);
 
 /*
diff --git a/mm/workingset.c b/mm/workingset.c
index 85f7472f07ba..8a16fcb573d8 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -740,7 +740,7 @@ static int __init workingset_init(void)
 	pr_info("workingset: timestamp_bits=%d max_order=%d bucket_order=%u\n",
 	       timestamp_bits, max_order, bucket_order);
 
-	ret = prealloc_shrinker(&workingset_shadow_shrinker);
+	ret = prealloc_shrinker(&workingset_shadow_shrinker, "shadow");
 	if (ret)
 		goto err;
 	ret = __list_lru_init(&shadow_nodes, true, &shadow_nodes_key,
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 9152fbde33b5..a19de176f604 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -2188,7 +2188,7 @@ static int zs_register_shrinker(struct zs_pool *pool)
 	pool->shrinker.batch = 0;
 	pool->shrinker.seeks = DEFAULT_SEEKS;
 
-	return register_shrinker(&pool->shrinker);
+	return register_shrinker(&pool->shrinker, "zspool");
 }
 
 /**
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index 682fcd24bf43..a29742a9c3f1 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -874,7 +874,7 @@ int __init rpcauth_init_module(void)
 	err = rpc_init_authunix();
 	if (err < 0)
 		goto out1;
-	err = register_shrinker(&rpc_cred_shrinker);
+	err = register_shrinker(&rpc_cred_shrinker, "rpc_cred");
 	if (err < 0)
 		goto out2;
 	return 0;
-- 
2.35.1





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