[chris@flap ~]$ sudo perf stat -e 'btrfs:*' -a sleep 70
##And then I loaded a few sites in Firefox early on in those 70 seconds.
Performance counter stats for 'system wide':
5 btrfs:btrfs_transaction_commit
29 btrfs:btrfs_inode_new
29 btrfs:btrfs_inode_request
25 btrfs:btrfs_inode_evict
1,602 btrfs:btrfs_get_extent
0 btrfs:btrfs_handle_em_exist
1 btrfs:btrfs_get_extent_show_fi_regular
88 btrfs:btrfs_truncate_show_fi_regular
19 btrfs:btrfs_get_extent_show_fi_inline
2 btrfs:btrfs_truncate_show_fi_inline
189 btrfs:btrfs_ordered_extent_add
189 btrfs:btrfs_ordered_extent_remove
9 btrfs:btrfs_ordered_extent_start
592 btrfs:btrfs_ordered_extent_put
1,207 btrfs:__extent_writepage
1,203 btrfs:btrfs_writepage_end_io_hook
25 btrfs:btrfs_sync_file
0 btrfs:btrfs_sync_fs
0 btrfs:btrfs_add_block_group
1,508 btrfs:add_delayed_tree_ref
1,498 btrfs:run_delayed_tree_ref
379 btrfs:add_delayed_data_ref
336 btrfs:run_delayed_data_ref
1,887 btrfs:add_delayed_ref_head
1,839 btrfs:run_delayed_ref_head
0 btrfs:btrfs_chunk_alloc
0 btrfs:btrfs_chunk_free
794 btrfs:btrfs_cow_block
6,982 btrfs:btrfs_space_reservation
0 btrfs:btrfs_trigger_flush
0 btrfs:btrfs_flush_space
952 btrfs:btrfs_reserved_extent_alloc
0 btrfs:btrfs_reserved_extent_free
1,005 btrfs:find_free_extent
1,005 btrfs:btrfs_reserve_extent
816 btrfs:btrfs_reserve_extent_cluster
1 btrfs:btrfs_find_cluster
0 btrfs:btrfs_failed_cluster_setup
1 btrfs:btrfs_setup_cluster
5,952 btrfs:alloc_extent_state
6,034 btrfs:free_extent_state
374 btrfs:btrfs_work_queued
362 btrfs:btrfs_work_sched
362 btrfs:btrfs_all_work_done
116 btrfs:btrfs_ordered_sched
0 btrfs:btrfs_workqueue_alloc
0 btrfs:btrfs_workqueue_destroy
0 btrfs:btrfs_qgroup_reserve_data
201 btrfs:btrfs_qgroup_release_data
1,839 btrfs:btrfs_qgroup_free_delayed_ref
0 btrfs:btrfs_qgroup_account_extents
0 btrfs:btrfs_qgroup_trace_extent
0 btrfs:btrfs_qgroup_account_extent
0 btrfs:qgroup_update_counters
0 btrfs:qgroup_update_reserve
0 btrfs:qgroup_meta_reserve
0 btrfs:qgroup_meta_convert
0 btrfs:qgroup_meta_free_all_pertrans
0 btrfs:btrfs_prelim_ref_merge
0 btrfs:btrfs_prelim_ref_insert
2,663 btrfs:btrfs_inode_mod_outstanding_extents
0 btrfs:btrfs_remove_block_group
0 btrfs:btrfs_add_unused_block_group
0 btrfs:btrfs_skip_unused_block_group
70.004723586 seconds time elapsed
[chris@flap ~]$
Seems like a lot of activity for just a few transactions, but what
really caught my eye here is the qgroup reporting for a file system
that has never had qgroups enabled. Is it expected?
Chris Murphy
