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mm: shrinkers: provide shrinkers with names 

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.

The expected format is:
    <subsystem>-<shrinker_type>[:<instance>]-<id>
For some shrinkers an instance can be encoded as (MAJOR:MINOR) pair.

After this change the shrinker debugfs directory looks like:
  $ cd /sys/kernel/debug/shrinker/
  $ ls
    dquota-cache-16     sb-devpts-28     sb-proc-47       sb-tmpfs-42
    mm-shadow-18        sb-devtmpfs-5    sb-proc-48       sb-tmpfs-43
    mm-zspool:zram0-34  sb-hugetlbfs-17  sb-pstore-31     sb-tmpfs-44
    rcu-kfree-0         sb-hugetlbfs-33  sb-rootfs-2      sb-tmpfs-49
    sb-aio-20           sb-iomem-12      sb-securityfs-6  sb-tracefs-13
    sb-anon_inodefs-15  sb-mqueue-21     sb-selinuxfs-22  sb-xfs:vda1-36
    sb-bdev-3           sb-nsfs-4        sb-sockfs-8      sb-zsmalloc-19
    sb-bpf-32           sb-pipefs-14     sb-sysfs-26      thp-deferred_split-10
    sb-btrfs:vda2-24    sb-proc-25       sb-tmpfs-1       thp-zero-9
    sb-cgroup2-30       sb-proc-39       sb-tmpfs-27      xfs-buf:vda1-37
    sb-configfs-23      sb-proc-41       sb-tmpfs-29      xfs-inodegc:vda1-38
    sb-dax-11           sb-proc-45       sb-tmpfs-35
    sb-debugfs-7        sb-proc-46       sb-tmpfs-40

[roman.gushchin@linux.dev: fix build warnings]
  Link: https://lkml.kernel.org/r/Yr+ZTnLb9lJk6fJO@castle
  Reported-by: kernel test robot <lkp@intel.com>
Link: https://lkml.kernel.org/r/20220601032227.4076670-4-roman.gushchin@linux.dev
Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: Hillf Danton <hdanton@sina.com>
Cc: Kent Overstreet <kent.overstreet@gmail.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Roman Gushchin 2022-05-31 20:22:24 -07:00 committed by akpm
parent 5035ebc644
commit e33c267ab7
39 changed files with 167 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kvm/mmu/mmu.c
View File

@ -6317,7 +6317,7 @@ 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, "x86-mmu");
if (ret)
goto out;

2
drivers/android/binder_alloc.c
View File

@ -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, "android-binder");
if (ret)
list_lru_destroy(&binder_alloc_lru);
}

3
drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
View File

@ -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));

2
drivers/gpu/drm/msm/msm_gem_shrinker.c
View File

@ -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));

2
drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
View File

@ -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"));
}
/**

2
drivers/gpu/drm/ttm/ttm_pool.c
View File

@ -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");
}
/**

2
drivers/md/bcache/btree.c
View File

@ -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, "md-bcache:%pU", c->set_uuid))
pr_warn("bcache: %s: could not register shrinker\n",
__func__);

3
drivers/md/dm-bufio.c
View File

@ -1806,7 +1806,8 @@ 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, "md-%s:(%u:%u)", slab_name,
MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
if (r)
goto bad;

4
drivers/md/dm-zoned-metadata.c
View File

@ -2944,7 +2944,9 @@ 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:(%u:%u)",
MAJOR(dev->bdev->bd_dev),
MINOR(dev->bdev->bd_dev));
if (ret) {
dmz_zmd_err(zmd, "Register metadata cache shrinker failed");
goto err;

2
drivers/md/raid5.c
View File

@ -7414,7 +7414,7 @@ static struct r5conf *setup_conf(struct mddev *mddev)
conf->shrinker.count_objects = raid5_cache_count;
conf->shrinker.batch = 128;
conf->shrinker.flags = 0;
ret = register_shrinker(&conf->shrinker);
ret = register_shrinker(&conf->shrinker, "md-raid5:%s", mdname(mddev));
if (ret) {
pr_warn("md/raid:%s: couldn't register shrinker.\n",
mdname(mddev));

2
drivers/misc/vmw_balloon.c
View File

@ -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;

2
drivers/virtio/virtio_balloon.c
View File

@ -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-balloon");
}
static int virtballoon_probe(struct virtio_device *vdev)

2
drivers/xen/xenbus/xenbus_probe_backend.c
View File

@ -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;

2
fs/btrfs/super.c
View File

@ -1815,6 +1815,8 @@ 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);

2
fs/erofs/utils.c
View File

@ -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-shrinker");
}
void erofs_exit_shrinker(void)

3
fs/ext4/extents_status.c
View File

@ -1654,7 +1654,8 @@ int ext4_es_register_shrinker(struct ext4_sb_info *sbi)
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:%s",
sbi->s_sb->s_id);
if (err)
goto err4;

2
fs/f2fs/super.c
View File

@ -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-shrinker");
if (err)
goto free_sysfs;
err = register_filesystem(&f2fs_fs_type);

2
fs/gfs2/glock.c
View File

@ -2533,7 +2533,7 @@ 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);

2
fs/gfs2/main.c
View File

@ -148,7 +148,7 @@ 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;

3
fs/jbd2/journal.c
View File

@ -1418,7 +1418,8 @@ 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:(%u:%u)",
MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev))) {
percpu_counter_destroy(&journal->j_checkpoint_jh_count);
goto err_cleanup;
}

2
fs/mbcache.c
View File

@ -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, "mbcache-shrinker")) {
kfree(cache->c_hash);
kfree(cache);
goto err_out;

7
fs/nfs/nfs42xattr.c
View File

@ -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;

2
fs/nfs/super.c
View File

@ -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

2
fs/nfsd/filecache.c
View File

@ -670,7 +670,7 @@ 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;

3
fs/nfsd/nfscache.c
View File

@ -176,7 +176,8 @@ 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:%s", nn->nfsd_name);
if (status)
goto out_stats_destroy;

2
fs/quota/dquot.c
View File

@ -2995,7 +2995,7 @@ 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, "dquota-cache"))
panic("Cannot register dquot shrinker");
return 0;

6
fs/super.c
View File

@ -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) {

2
fs/ubifs/super.c
View File

@ -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-slab");
if (err)
goto out_slab;

3
fs/xfs/xfs_buf.c
View File

@ -1986,7 +1986,8 @@ 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:%s",
mp->m_super->s_id))
goto error_pcpu;
return btp;

2
fs/xfs/xfs_icache.c
View File

@ -2201,5 +2201,5 @@ xfs_inodegc_register_shrinker(
shrink->flags = SHRINKER_NONSLAB;
shrink->batch = XFS_INODEGC_SHRINKER_BATCH;
return register_shrinker(shrink);
return register_shrinker(shrink, "xfs-inodegc:%s", mp->m_super->s_id);
}

3
fs/xfs/xfs_qm.c
View File

@ -677,7 +677,8 @@ 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:%s",
mp->m_super->s_id);
if (error)
goto out_free_inos;

14
include/linux/shrinker.h
View File

@ -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 +93,11 @@ struct shrinker {
*/
#define SHRINKER_NONSLAB (1 << 3)
extern int prealloc_shrinker(struct shrinker *shrinker);
extern int __printf(2, 3) 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 __printf(2, 3) 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 +105,8 @@ 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 __printf(2, 3) shrinker_debugfs_rename(struct shrinker *shrinker,
const char *fmt, ...);
#else /* CONFIG_SHRINKER_DEBUG */
static inline int shrinker_debugfs_add(struct shrinker *shrinker)
{
@ -110,5 +115,10 @@ static inline int shrinker_debugfs_add(struct shrinker *shrinker)
static inline void shrinker_debugfs_remove(struct shrinker *shrinker)
{
}
static inline __printf(2, 3)
int shrinker_debugfs_rename(struct shrinker *shrinker, const char *fmt, ...)
{
return 0;
}
#endif /* CONFIG_SHRINKER_DEBUG */
#endif /* _LINUX_SHRINKER_H */

2
kernel/rcu/tree.c
View File

@ -4884,7 +4884,7 @@ 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, "rcu-kfree"))
pr_err("Failed to register kfree_rcu() shrinker!\n");
}

4
mm/huge_memory.c
View File

@ -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;

47
mm/shrinker_debug.c
View File

@ -102,7 +102,7 @@ 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);
@ -116,7 +116,7 @@ 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);
@ -131,10 +131,53 @@ 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 *new, *old;
va_list ap;
int ret = 0;
va_start(ap, fmt);
new = kvasprintf_const(GFP_KERNEL, fmt, ap);
va_end(ap);
if (!new)
return -ENOMEM;
down_write(&shrinker_rwsem);
old = shrinker->name;
shrinker->name = new;
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;
}
up_write(&shrinker_rwsem);
kfree_const(old);
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;

58
mm/vmscan.c
View File

@ -608,7 +608,7 @@ 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;
@ -632,8 +632,36 @@ 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);
@ -654,15 +682,39 @@ 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;
err = __register_shrinker(shrinker);
if (err)
kfree_const(shrinker->name);
return err;
}
#else
int register_shrinker(struct shrinker *shrinker, const char *fmt, ...)
{
return __register_shrinker(shrinker);
}
#endif
EXPORT_SYMBOL(register_shrinker);
/*

2
mm/workingset.c
View File

@ -625,7 +625,7 @@ 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, "mm-shadow");
if (ret)
goto err;
ret = __list_lru_init(&shadow_nodes, true, &shadow_nodes_key,

3
mm/zsmalloc.c
View File

@ -2217,7 +2217,8 @@ 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, "mm-zspool:%s",
pool->name);
}
/**

2
net/sunrpc/auth.c
View File

@ -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, "sunrpc_cred");
if (err < 0)
goto out2;
return 0;