Btrfs: trace pinned extents

Pinned extents are an important metric to keep track of for enospc.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 2c17b62..9aa64f1 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -6246,6 +6246,9 @@ static int update_block_group(struct btrfs_trans_handle *trans,
                        spin_unlock(&cache->lock);
                        spin_unlock(&cache->space_info->lock);
 
+                       trace_btrfs_space_reservation(root->fs_info, "pinned",
+                                                     cache->space_info->flags,
+                                                     num_bytes, 1);
                        set_extent_dirty(info->pinned_extents,
                                         bytenr, bytenr + num_bytes - 1,
                                         GFP_NOFS | __GFP_NOFAIL);
@@ -6320,6 +6323,8 @@ static int pin_down_extent(struct btrfs_root *root,
        spin_unlock(&cache->lock);
        spin_unlock(&cache->space_info->lock);
 
+       trace_btrfs_space_reservation(root->fs_info, "pinned",
+                                     cache->space_info->flags, num_bytes, 1);
        set_extent_dirty(root->fs_info->pinned_extents, bytenr,
                         bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL);
        if (reserved)
@@ -6678,6 +6683,9 @@ static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end,
                spin_lock(&cache->lock);
                cache->pinned -= len;
                space_info->bytes_pinned -= len;
+
+               trace_btrfs_space_reservation(fs_info, "pinned",
+                                             space_info->flags, len, 0);
                space_info->max_extent_size = 0;
                percpu_counter_add(&space_info->total_bytes_pinned, -len);
                if (cache->ro) {