@@ -2133,6 +2133,7 @@ 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;
@@ -2142,6 +2143,7 @@ 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) {
@@ -2187,6 +2189,8 @@ 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;
}
@@ -1575,6 +1575,27 @@ 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,
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 analyse later balance performance improvement. Signed-off-by: Qu Wenruo <wqu@suse.com> --- fs/btrfs/qgroup.c | 4 ++++ include/trace/events/btrfs.h | 21 +++++++++++++++++++++ 2 files changed, 25 insertions(+)