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Commit c337e7b0 authored by Qu Wenruo's avatar Qu Wenruo Committed by David Sterba
Browse files

btrfs: qgroup: Introduce trace event to analyse the number of dirty extents accounted 



Number of qgroup dirty extents is directly linked to the performance
overhead, so add a new trace event, trace_qgroup_num_dirty_extents(), to
record how many dirty extents is processed in
btrfs_qgroup_account_extents().

This will be pretty handy to analyze later balance performance
improvement.

Signed-off-by: default avatarQu Wenruo <wqu@suse.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent fa6ac715

fs/btrfs/qgroup.c

+4 −0
Original line number Diff line number Diff line
@@ -2132,6 +2132,7 @@ int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans) 
	struct btrfs_delayed_ref_root *delayed_refs;

	struct ulist *new_roots = NULL;

	struct rb_node *node;

	u64 num_dirty_extents = 0;

	u64 qgroup_to_skip;

	int ret = 0;
@@ -2141,6 +2142,7 @@ int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans) 
		record = rb_entry(node, struct btrfs_qgroup_extent_record,

				  node);



		num_dirty_extents++;

		trace_btrfs_qgroup_account_extents(fs_info, record);



		if (!ret) {
@@ -2186,6 +2188,8 @@ int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans) 
		kfree(record);



	}

	trace_qgroup_num_dirty_extents(fs_info, trans->transid,

				       num_dirty_extents);

	return ret;

}

include/trace/events/btrfs.h

+21 −0
Original line number Diff line number Diff line
@@ -1576,6 +1576,27 @@ DEFINE_EVENT(btrfs_qgroup_extent, btrfs_qgroup_trace_extent, 
	TP_ARGS(fs_info, rec)

);



TRACE_EVENT(qgroup_num_dirty_extents,



	TP_PROTO(const struct btrfs_fs_info *fs_info, u64 transid,

		 u64 num_dirty_extents),



	TP_ARGS(fs_info, transid, num_dirty_extents),



	TP_STRUCT__entry_btrfs(

		__field(	u64, transid			)

		__field(	u64, num_dirty_extents		)

	),



	TP_fast_assign_btrfs(fs_info,

		__entry->transid	   = transid;

		__entry->num_dirty_extents = num_dirty_extents;

	),



	TP_printk_btrfs("transid=%llu num_dirty_extents=%llu",

		__entry->transid, __entry->num_dirty_extents)

);



TRACE_EVENT(btrfs_qgroup_account_extent,



	TP_PROTO(const struct btrfs_fs_info *fs_info, u64 transid, u64 bytenr,