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Thu, 27 Jul 2023 01:14:21 -0700 (PDT) From: Qi Zheng To: akpm@linux-foundation.org, david@fromorbit.com, tkhai@ya.ru, vbabka@suse.cz, roman.gushchin@linux.dev, djwong@kernel.org, brauner@kernel.org, paulmck@kernel.org, tytso@mit.edu, steven.price@arm.com, cel@kernel.org, senozhatsky@chromium.org, yujie.liu@intel.com, gregkh@linuxfoundation.org, muchun.song@linux.dev Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, linux-erofs@lists.ozlabs.org, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, linux-nfs@vger.kernel.org, linux-mtd@lists.infradead.org, rcu@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, dm-devel@redhat.com, linux-raid@vger.kernel.org, linux-bcache@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, linux-btrfs@vger.kernel.org, Qi Zheng , Muchun Song Subject: [PATCH v3 42/49] fs: super: dynamically allocate the s_shrink Date: Thu, 27 Jul 2023 16:04:55 +0800 Message-Id: <20230727080502.77895-43-zhengqi.arch@bytedance.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) In-Reply-To: <20230727080502.77895-1-zhengqi.arch@bytedance.com> References: <20230727080502.77895-1-zhengqi.arch@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @bytedance.com) X-ZM-MESSAGEID: 1690445719519100001 Content-Type: text/plain; charset="utf-8" In preparation for implementing lockless slab shrink, use new APIs to dynamically allocate the s_shrink, so that it can be freed asynchronously using kfree_rcu(). Then it doesn't need to wait for RCU read-side critical section when releasing the struct super_block. Signed-off-by: Qi Zheng Reviewed-by: Muchun Song --- fs/btrfs/super.c | 2 +- fs/kernfs/mount.c | 2 +- fs/proc/root.c | 2 +- fs/super.c | 36 ++++++++++++++++++++---------------- include/linux/fs.h | 2 +- 5 files changed, 24 insertions(+), 20 deletions(-) diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index cffdd6f7f8e8..4c9c878b0da4 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -1519,7 +1519,7 @@ static struct dentry *btrfs_mount_root(struct file_sy= stem_type *fs_type, error =3D -EBUSY; } else { snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); - shrinker_debugfs_rename(&s->s_shrink, "sb-%s:%s", fs_type->name, + shrinker_debugfs_rename(s->s_shrink, "sb-%s:%s", fs_type->name, s->s_id); btrfs_sb(s)->bdev_holder =3D fs_type; error =3D btrfs_fill_super(s, fs_devices, data); diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c index d49606accb07..2657ff1181f1 100644 --- a/fs/kernfs/mount.c +++ b/fs/kernfs/mount.c @@ -256,7 +256,7 @@ static int kernfs_fill_super(struct super_block *sb, st= ruct kernfs_fs_context *k sb->s_time_gran =3D 1; =20 /* sysfs dentries and inodes don't require IO to create */ - sb->s_shrink.seeks =3D 0; + sb->s_shrink->seeks =3D 0; =20 /* get root inode, initialize and unlock it */ down_read(&kf_root->kernfs_rwsem); diff --git a/fs/proc/root.c b/fs/proc/root.c index a86e65a608da..22b78b28b477 100644 --- a/fs/proc/root.c +++ b/fs/proc/root.c @@ -188,7 +188,7 @@ static int proc_fill_super(struct super_block *s, struc= t fs_context *fc) s->s_stack_depth =3D FILESYSTEM_MAX_STACK_DEPTH; =20 /* procfs dentries and inodes don't require IO to create */ - s->s_shrink.seeks =3D 0; + s->s_shrink->seeks =3D 0; =20 pde_get(&proc_root); root_inode =3D proc_get_inode(s, &proc_root); diff --git a/fs/super.c b/fs/super.c index da68584815e4..68b3877af941 100644 --- a/fs/super.c +++ b/fs/super.c @@ -67,7 +67,7 @@ static unsigned long super_cache_scan(struct shrinker *sh= rink, long dentries; long inodes; =20 - sb =3D container_of(shrink, struct super_block, s_shrink); + sb =3D shrink->private_data; =20 /* * Deadlock avoidance. We may hold various FS locks, and we don't want @@ -120,7 +120,7 @@ static unsigned long super_cache_count(struct shrinker = *shrink, struct super_block *sb; long total_objects =3D 0; =20 - sb =3D container_of(shrink, struct super_block, s_shrink); + sb =3D shrink->private_data; =20 /* * We don't call trylock_super() here as it is a scalability bottleneck, @@ -182,7 +182,7 @@ static void destroy_unused_super(struct super_block *s) security_sb_free(s); put_user_ns(s->s_user_ns); kfree(s->s_subtype); - free_prealloced_shrinker(&s->s_shrink); + shrinker_free(s->s_shrink); /* no delays needed */ destroy_super_work(&s->destroy_work); } @@ -259,16 +259,20 @@ static struct super_block *alloc_super(struct file_sy= stem_type *type, int flags, s->s_time_min =3D TIME64_MIN; s->s_time_max =3D TIME64_MAX; =20 - s->s_shrink.seeks =3D DEFAULT_SEEKS; - s->s_shrink.scan_objects =3D super_cache_scan; - s->s_shrink.count_objects =3D super_cache_count; - s->s_shrink.batch =3D 1024; - s->s_shrink.flags =3D SHRINKER_NUMA_AWARE | SHRINKER_MEMCG_AWARE; - if (prealloc_shrinker(&s->s_shrink, "sb-%s", type->name)) + s->s_shrink =3D shrinker_alloc(SHRINKER_NUMA_AWARE | SHRINKER_MEMCG_AWARE, + "sb-%s", type->name); + if (!s->s_shrink) goto fail; - if (list_lru_init_memcg(&s->s_dentry_lru, &s->s_shrink)) + + s->s_shrink->seeks =3D DEFAULT_SEEKS; + s->s_shrink->scan_objects =3D super_cache_scan; + s->s_shrink->count_objects =3D super_cache_count; + s->s_shrink->batch =3D 1024; + s->s_shrink->private_data =3D s; + + if (list_lru_init_memcg(&s->s_dentry_lru, s->s_shrink)) goto fail; - if (list_lru_init_memcg(&s->s_inode_lru, &s->s_shrink)) + if (list_lru_init_memcg(&s->s_inode_lru, s->s_shrink)) goto fail; return s; =20 @@ -326,7 +330,7 @@ void deactivate_locked_super(struct super_block *s) { struct file_system_type *fs =3D s->s_type; if (atomic_dec_and_test(&s->s_active)) { - unregister_shrinker(&s->s_shrink); + shrinker_free(s->s_shrink); fs->kill_sb(s); =20 /* @@ -599,7 +603,7 @@ struct super_block *sget_fc(struct fs_context *fc, hlist_add_head(&s->s_instances, &s->s_type->fs_supers); spin_unlock(&sb_lock); get_filesystem(s->s_type); - register_shrinker_prepared(&s->s_shrink); + shrinker_register(s->s_shrink); return s; =20 share_extant_sb: @@ -678,7 +682,7 @@ struct super_block *sget(struct file_system_type *type, hlist_add_head(&s->s_instances, &type->fs_supers); spin_unlock(&sb_lock); get_filesystem(type); - register_shrinker_prepared(&s->s_shrink); + shrinker_register(s->s_shrink); return s; } EXPORT_SYMBOL(sget); @@ -1312,7 +1316,7 @@ int get_tree_bdev(struct fs_context *fc, down_write(&s->s_umount); } else { snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); - shrinker_debugfs_rename(&s->s_shrink, "sb-%s:%s", + shrinker_debugfs_rename(s->s_shrink, "sb-%s:%s", fc->fs_type->name, s->s_id); sb_set_blocksize(s, block_size(bdev)); error =3D fill_super(s, fc); @@ -1385,7 +1389,7 @@ struct dentry *mount_bdev(struct file_system_type *fs= _type, down_write(&s->s_umount); } else { snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); - shrinker_debugfs_rename(&s->s_shrink, "sb-%s:%s", + shrinker_debugfs_rename(s->s_shrink, "sb-%s:%s", fs_type->name, s->s_id); sb_set_blocksize(s, block_size(bdev)); error =3D fill_super(s, data, flags & SB_SILENT ? 1 : 0); diff --git a/include/linux/fs.h b/include/linux/fs.h index 891cf662b26f..500238213fd9 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1232,7 +1232,7 @@ struct super_block { =20 const struct dentry_operations *s_d_op; /* default d_op for dentries */ =20 - struct shrinker s_shrink; /* per-sb shrinker handle */ + struct shrinker *s_shrink; /* per-sb shrinker handle */ =20 /* Number of inodes with nlink =3D=3D 0 but still referenced */ atomic_long_t s_remove_count; --=20 2.30.2