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

From: Roman Gushchin
Date: Fri Apr 15 2022 - 20:28:58 EST

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