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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: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2018-09-27 14:42:29 +08:00 committed by David Sterba
parent fa6ac71524
commit c337e7b02f
2 changed files with 25 additions and 0 deletions
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4
fs/btrfs/qgroup.c
View File

@ -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;
}

21
include/trace/events/btrfs.h
View File

@ -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,