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From: Roman Gushchin To: Muchun Song Cc: Andrew Morton , linux-mm@kvack.org, Dave Chinner , linux-kernel@vger.kernel.org, Kent Overstreet , Hillf Danton , Christophe JAILLET Subject: Re: [PATCH v3 3/6] mm: shrinkers: provide shrinkers with names Message-ID: References: <20220509183820.573666-1-roman.gushchin@linux.dev> <20220509183820.573666-4-roman.gushchin@linux.dev> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: linux.dev Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, May 22, 2022 at 07:08:24PM +0800, Muchun Song wrote: > On Mon, May 09, 2022 at 11:38:17AM -0700, Roman Gushchin wrote: > > 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. > > > > In some cases it's not possible to determine a good name at the time > > when a shrinker is allocated. For such cases shrinker_debugfs_rename() > > is provided. > > > > After this change the shrinker debugfs directory looks like: > > $ cd /sys/kernel/debug/shrinker/ > > $ ls > > dqcache-16 sb-hugetlbfs-17 sb-rootfs-2 sb-tmpfs-50 > > kfree_rcu-0 sb-hugetlbfs-33 sb-securityfs-6 sb-tracefs-13 > > sb-aio-20 sb-iomem-12 sb-selinuxfs-22 sb-xfs:vda1-36 > > sb-anon_inodefs-15 sb-mqueue-21 sb-sockfs-8 sb-zsmalloc-19 > > sb-bdev-3 sb-nsfs-4 sb-sysfs-26 shadow-18 > > sb-bpf-32 sb-pipefs-14 sb-tmpfs-1 thp_deferred_split-10 > > sb-btrfs:vda2-24 sb-proc-25 sb-tmpfs-27 thp_zero-9 > > sb-cgroup2-30 sb-proc-39 sb-tmpfs-29 xfs_buf-37 > > sb-configfs-23 sb-proc-41 sb-tmpfs-35 xfs_inodegc-38 > > sb-dax-11 sb-proc-45 sb-tmpfs-40 zspool-34 > > sb-debugfs-7 sb-proc-46 sb-tmpfs-42 > > sb-devpts-28 sb-proc-47 sb-tmpfs-43 > > sb-devtmpfs-5 sb-pstore-31 sb-tmpfs-44 > > > > Signed-off-by: Roman Gushchin > > --- > > 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/btrfs/super.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 | 6 +- > > 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 | 12 +++- > > kernel/rcu/tree.c | 2 +- > > mm/huge_memory.c | 4 +- > > mm/shrinker_debug.c | 45 +++++++++++++- > > mm/vmscan.c | 58 ++++++++++++++++++- > > mm/workingset.c | 2 +- > > mm/zsmalloc.c | 2 +- > > net/sunrpc/auth.c | 2 +- > > 39 files changed, 154 insertions(+), 46 deletions(-) > > > > diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c > > index c623019929a7..8cfabdd63406 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 5ffa1dcf84cf..bcc95898c341 100644 > > --- a/drivers/md/dm-bufio.c > > +++ b/drivers/md/dm-bufio.c > > @@ -1806,7 +1806,7 @@ 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 59f91e392a2a..34ddebd3aff7 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-%s", mdname(mddev))) { > > 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/btrfs/super.c b/fs/btrfs/super.c > > index 206f44005c52..062dbd8071e2 100644 > > --- a/fs/btrfs/super.c > > +++ b/fs/btrfs/super.c > > @@ -1790,6 +1790,8 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, > > error = -EBUSY; > > } else { > > snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); > > + shrinker_debugfs_rename(&s->s_shrink, "sb-%s:%s", fs_type->name, > > + s->s_id); > > btrfs_sb(s)->bdev_holder = fs_type; > > if (!strstr(crc32c_impl(), "generic")) > > set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags); > > 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 4368f90571bd..2fc40a1635f3 100644 > > --- a/fs/f2fs/super.c > > +++ b/fs/f2fs/super.c > > @@ -4579,7 +4579,7 @@ 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 c0cbeeaec2d1..e7786445ecc1 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 60f57c7bc0a6..4fca6657f442 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; > > @@ -1288,6 +1288,8 @@ int get_tree_bdev(struct fs_context *fc, > > } else { > > s->s_mode = mode; > > snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); > > + shrinker_debugfs_rename(&s->s_shrink, "sb-%s:%s", > > + fc->fs_type->name, s->s_id); > > sb_set_blocksize(s, block_size(bdev)); > > error = fill_super(s, fc); > > if (error) { > > @@ -1363,6 +1365,8 @@ struct dentry *mount_bdev(struct file_system_type *fs_type, > > } else { > > s->s_mode = mode; > > snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); > > + shrinker_debugfs_rename(&s->s_shrink, "sb-%s:%s", > > + fs_type->name, s->s_id); > > sb_set_blocksize(s, block_size(bdev)); > > error = fill_super(s, data, flags & SB_SILENT ? 1 : 0); > > if (error) { > > 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 2ced8149c513..64416f3e0a1f 100644 > > --- a/include/linux/shrinker.h > > +++ b/include/linux/shrinker.h > > @@ -75,6 +75,7 @@ struct shrinker { > > #endif > > #ifdef CONFIG_SHRINKER_DEBUG > > int debugfs_id; > > + const char *name; > > struct dentry *debugfs_entry; > > #endif > > /* objs pending delete, per node */ > > @@ -92,9 +93,9 @@ 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); > > @@ -102,6 +103,8 @@ extern void synchronize_shrinkers(void); > > #ifdef CONFIG_SHRINKER_DEBUG > > extern int shrinker_debugfs_add(struct shrinker *shrinker); > > extern void shrinker_debugfs_remove(struct shrinker *shrinker); > > +extern int shrinker_debugfs_rename(struct shrinker *shrinker, > > + const char *fmt, ...); > > #else /* CONFIG_SHRINKER_DEBUG */ > > static inline int shrinker_debugfs_add(struct shrinker *shrinker) > > { > > @@ -110,5 +113,10 @@ static inline int shrinker_debugfs_add(struct shrinker *shrinker) > > static inline void shrinker_debugfs_remove(struct shrinker *shrinker) > > { > > } > > +static inline int shrinker_debugfs_rename(struct shrinker *shrinker, > > + const char *fmt, ...) > > +{ > > + return 0; > > +} > > #endif /* CONFIG_SHRINKER_DEBUG */ > > #endif /* _LINUX_SHRINKER_H */ > > diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c > > index 5c587e00811c..b4c66916bea9 100644 > > --- a/kernel/rcu/tree.c > > +++ b/kernel/rcu/tree.c > > @@ -4978,7 +4978,7 @@ 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 fa6a1623976a..a40df19c0e38 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 fd1f805a581a..28b1c1ab60ef 100644 > > --- a/mm/shrinker_debug.c > > +++ b/mm/shrinker_debug.c > > @@ -104,7 +104,7 @@ DEFINE_SHOW_ATTRIBUTE(shrinker_debugfs_count); > > int shrinker_debugfs_add(struct shrinker *shrinker) > > { > > struct dentry *entry; > > - char buf[16]; > > + char buf[128]; > > int id; > > > > lockdep_assert_held(&shrinker_rwsem); > > @@ -118,7 +118,7 @@ int shrinker_debugfs_add(struct shrinker *shrinker) > > return id; > > shrinker->debugfs_id = id; > > > > - snprintf(buf, sizeof(buf), "%d", id); > > + snprintf(buf, sizeof(buf), "%s-%d", shrinker->name, id); > > > > /* create debugfs entry */ > > entry = debugfs_create_dir(buf, shrinker_debugfs_root); > > @@ -133,10 +133,51 @@ int shrinker_debugfs_add(struct shrinker *shrinker) > > return 0; > > } > > > > +int shrinker_debugfs_rename(struct shrinker *shrinker, const char *fmt, ...) > > +{ > > + struct dentry *entry; > > + char buf[128]; > > + const char *old; > > + va_list ap; > > + int ret = 0; > > + > > + down_write(&shrinker_rwsem); > > + > > + old = shrinker->name; > > + > > + va_start(ap, fmt); > > + shrinker->name = kvasprintf_const(GFP_KERNEL, fmt, ap); > > + va_end(ap); > > + if (!shrinker->name) { > > + shrinker->name = old; > > + ret = -ENOMEM; > > Seems we could move those 6 lines out of shrinker_rwsem. I know > this function is not in a hot path, but it it better to improve > it if it is easy, right? Not sure if it worth it, but ok, it's indeed easy. > > > + } else if (shrinker->debugfs_entry) { > > + snprintf(buf, sizeof(buf), "%s-%d", shrinker->name, > > + shrinker->debugfs_id); > > + > > + entry = debugfs_rename(shrinker_debugfs_root, > > + shrinker->debugfs_entry, > > + shrinker_debugfs_root, buf); > > + if (IS_ERR(entry)) > > + ret = PTR_ERR(entry); > > + else > > + shrinker->debugfs_entry = entry; > > + > > + kfree_const(old); > > + } > > + > > + up_write(&shrinker_rwsem); > > + > > + return ret; > > +} > > +EXPORT_SYMBOL(shrinker_debugfs_rename); > > + > > void shrinker_debugfs_remove(struct shrinker *shrinker) > > { > > lockdep_assert_held(&shrinker_rwsem); > > > > + kfree_const(shrinker->name); > > + > > if (!shrinker->debugfs_entry) > > return; > > > > diff --git a/mm/vmscan.c b/mm/vmscan.c > > index 024f7056b98c..42bae0fd0442 100644 > > --- a/mm/vmscan.c > > +++ b/mm/vmscan.c > > @@ -613,7 +613,7 @@ 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; > > @@ -637,8 +637,36 @@ int prealloc_shrinker(struct shrinker *shrinker) > > return 0; > > } > > > > +#ifdef CONFIG_SHRINKER_DEBUG > > +int prealloc_shrinker(struct shrinker *shrinker, const char *fmt, ...) > > +{ > > + va_list ap; > > + int err; > > + > > + va_start(ap, fmt); > > + shrinker->name = kvasprintf_const(GFP_KERNEL, fmt, ap); > > + va_end(ap); > > + if (!shrinker->name) > > + return -ENOMEM; > > + > > + err = __prealloc_shrinker(shrinker); > > + if (err) > > + kfree_const(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) > > { > > +#ifdef CONFIG_SHRINKER_DEBUG > > + kfree_const(shrinker->name); > > +#endif > > if (shrinker->flags & SHRINKER_MEMCG_AWARE) { > > down_write(&shrinker_rwsem); > > unregister_memcg_shrinker(shrinker); > > @@ -659,15 +687,39 @@ 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, ...) > > +{ > > + va_list ap; > > + int err; > > + > > + va_start(ap, fmt); > > + shrinker->name = kvasprintf_const(GFP_KERNEL, fmt, ap); > > + va_end(ap); > > + if (!shrinker->name) > > + return -ENOMEM; > > + > > How about moving those initialization of name into shrinker_debugfs_add()? > Then maybe we could hide handling to "name" from vmscan.c. shrinker_debugfs_add() can be delayed up to the moment when debugfs is initialized. Some shrinkers are registered earlier. So it's not (easily) possible. Thanks!