From f1d97e76915285013037c487d9513ab763005286 Mon Sep 17 00:00:00 2001 From: Filipe Manana Date: Fri, 22 Mar 2024 18:02:59 +0000 Subject: [PATCH] btrfs: add a global per cpu counter to track number of used extent maps Add a per cpu counter that tracks the total number of extent maps that are in extent trees of inodes that belong to fs trees. This is going to be used in an upcoming change that adds a shrinker for extent maps. Only extent maps for fs trees are considered, because for special trees such as the data relocation tree we don't want to evict their extent maps which are critical for the relocation to work, and since those are limited, it's not a concern to have them in memory during the relocation of a block group. Another case are extent maps for free space cache inodes, which must always remain in memory, but those are limited (there's only one per free space cache inode, which means one per block group). Reviewed-by: Josef Bacik Signed-off-by: Filipe Manana Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/disk-io.c | 9 +++++++++ fs/btrfs/extent_map.c | 17 +++++++++++++++++ fs/btrfs/fs.h | 2 ++ 3 files changed, 28 insertions(+) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index cee2e4f43dc6..c2dc88f909b0 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1266,9 +1266,14 @@ static void free_global_roots(struct btrfs_fs_info *fs_info) void btrfs_free_fs_info(struct btrfs_fs_info *fs_info) { + struct percpu_counter *em_counter = &fs_info->evictable_extent_maps; + percpu_counter_destroy(&fs_info->dirty_metadata_bytes); percpu_counter_destroy(&fs_info->delalloc_bytes); percpu_counter_destroy(&fs_info->ordered_bytes); + if (percpu_counter_initialized(em_counter)) + ASSERT(percpu_counter_sum_positive(em_counter) == 0); + percpu_counter_destroy(em_counter); percpu_counter_destroy(&fs_info->dev_replace.bio_counter); btrfs_free_csum_hash(fs_info); btrfs_free_stripe_hash_table(fs_info); @@ -2848,6 +2853,10 @@ static int init_mount_fs_info(struct btrfs_fs_info *fs_info, struct super_block if (ret) return ret; + ret = percpu_counter_init(&fs_info->evictable_extent_maps, 0, GFP_KERNEL); + if (ret) + return ret; + ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL); if (ret) return ret; diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c index fca08ac95a4a..031c124c514c 100644 --- a/fs/btrfs/extent_map.c +++ b/fs/btrfs/extent_map.c @@ -76,6 +76,14 @@ static u64 range_end(u64 start, u64 len) return start + len; } +static void dec_evictable_extent_maps(struct btrfs_inode *inode) +{ + struct btrfs_fs_info *fs_info = inode->root->fs_info; + + if (!btrfs_is_testing(fs_info) && is_fstree(btrfs_root_id(inode->root))) + percpu_counter_dec(&fs_info->evictable_extent_maps); +} + static int tree_insert(struct rb_root_cached *root, struct extent_map *em) { struct rb_node **p = &root->rb_root.rb_node; @@ -259,6 +267,7 @@ static void try_merge_map(struct btrfs_inode *inode, struct extent_map *em) rb_erase_cached(&merge->rb_node, &tree->map); RB_CLEAR_NODE(&merge->rb_node); free_extent_map(merge); + dec_evictable_extent_maps(inode); } } @@ -273,6 +282,7 @@ static void try_merge_map(struct btrfs_inode *inode, struct extent_map *em) em->generation = max(em->generation, merge->generation); em->flags |= EXTENT_FLAG_MERGED; free_extent_map(merge); + dec_evictable_extent_maps(inode); } } @@ -372,6 +382,8 @@ static int add_extent_mapping(struct btrfs_inode *inode, struct extent_map *em, int modified) { struct extent_map_tree *tree = &inode->extent_tree; + struct btrfs_root *root = inode->root; + struct btrfs_fs_info *fs_info = root->fs_info; int ret; lockdep_assert_held_write(&tree->lock); @@ -382,6 +394,9 @@ static int add_extent_mapping(struct btrfs_inode *inode, setup_extent_mapping(inode, em, modified); + if (!btrfs_is_testing(fs_info) && is_fstree(btrfs_root_id(root))) + percpu_counter_inc(&fs_info->evictable_extent_maps); + return 0; } @@ -467,6 +482,8 @@ void remove_extent_mapping(struct btrfs_inode *inode, struct extent_map *em) if (!(em->flags & EXTENT_FLAG_LOGGING)) list_del_init(&em->list); RB_CLEAR_NODE(&em->rb_node); + + dec_evictable_extent_maps(inode); } static void replace_extent_mapping(struct btrfs_inode *inode, diff --git a/fs/btrfs/fs.h b/fs/btrfs/fs.h index 93f5c57ea4e3..534d30dafe32 100644 --- a/fs/btrfs/fs.h +++ b/fs/btrfs/fs.h @@ -630,6 +630,8 @@ struct btrfs_fs_info { s32 dirty_metadata_batch; s32 delalloc_batch; + struct percpu_counter evictable_extent_maps; + /* Protected by 'trans_lock'. */ struct list_head dirty_cowonly_roots;