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Commit 0f5dcf8d authored by Mark Fasheh's avatar Mark Fasheh Committed by David Sterba
Browse files

btrfs: Add qgroup tracing 



This patch adds tracepoints to the qgroup code on both the reporting side
(insert_dirty_extents) and the accounting side. Taken together it allows us
to see what qgroup operations have happened, and what their result was.

Signed-off-by: default avatarMark Fasheh <mfasheh@suse.de>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent c79b4713

fs/btrfs/qgroup.c

+9 −0
Original line number Diff line number Diff line
@@ -1463,6 +1463,7 @@ struct btrfs_qgroup_extent_record 
	u64 bytenr = record->bytenr;



	assert_spin_locked(&delayed_refs->lock);

	trace_btrfs_qgroup_insert_dirty_extent(record);



	while (*p) {

		parent_node = *p;
@@ -1594,6 +1595,9 @@ static int qgroup_update_counters(struct btrfs_fs_info *fs_info, 
		cur_old_count = btrfs_qgroup_get_old_refcnt(qg, seq);

		cur_new_count = btrfs_qgroup_get_new_refcnt(qg, seq);



		trace_qgroup_update_counters(qg->qgroupid, cur_old_count,

					     cur_new_count);



		/* Rfer update part */

		if (cur_old_count == 0 && cur_new_count > 0) {

			qg->rfer += num_bytes;
@@ -1683,6 +1687,9 @@ btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans, 
		goto out_free;

	BUG_ON(!fs_info->quota_root);



	trace_btrfs_qgroup_account_extent(bytenr, num_bytes, nr_old_roots,

					  nr_new_roots);



	qgroups = ulist_alloc(GFP_NOFS);

	if (!qgroups) {

		ret = -ENOMEM;
@@ -1752,6 +1759,8 @@ int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans, 
		record = rb_entry(node, struct btrfs_qgroup_extent_record,

				  node);



		trace_btrfs_qgroup_account_extents(record);



		if (!ret) {

			/*

			 * Use (u64)-1 as time_seq to do special search, which

include/trace/events/btrfs.h

+88 −1
Original line number Diff line number Diff line
@@ -23,7 +23,7 @@ struct map_lookup; 
struct extent_buffer;

struct btrfs_work;

struct __btrfs_workqueue;

struct btrfs_qgroup_operation;

struct btrfs_qgroup_extent_record;



#define show_ref_type(type)						\

	__print_symbolic(type,						\
@@ -1231,6 +1231,93 @@ DEFINE_EVENT(btrfs__qgroup_delayed_ref, btrfs_qgroup_free_delayed_ref, 


	TP_ARGS(ref_root, reserved)

);



DECLARE_EVENT_CLASS(btrfs_qgroup_extent,

	TP_PROTO(struct btrfs_qgroup_extent_record *rec),



	TP_ARGS(rec),



	TP_STRUCT__entry(

		__field(	u64,  bytenr		)

		__field(	u64,  num_bytes		)

	),



	TP_fast_assign(

		__entry->bytenr		= rec->bytenr,

		__entry->num_bytes	= rec->num_bytes;

	),



	TP_printk("bytenr = %llu, num_bytes = %llu",

		  (unsigned long long)__entry->bytenr,

		  (unsigned long long)__entry->num_bytes)

);



DEFINE_EVENT(btrfs_qgroup_extent, btrfs_qgroup_account_extents,



	TP_PROTO(struct btrfs_qgroup_extent_record *rec),



	TP_ARGS(rec)

);



DEFINE_EVENT(btrfs_qgroup_extent, btrfs_qgroup_insert_dirty_extent,



	TP_PROTO(struct btrfs_qgroup_extent_record *rec),



	TP_ARGS(rec)

);



TRACE_EVENT(btrfs_qgroup_account_extent,



	TP_PROTO(u64 bytenr, u64 num_bytes, u64 nr_old_roots, u64 nr_new_roots),



	TP_ARGS(bytenr, num_bytes, nr_old_roots, nr_new_roots),



	TP_STRUCT__entry(

		__field(	u64,  bytenr			)

		__field(	u64,  num_bytes			)

		__field(	u64,  nr_old_roots		)

		__field(	u64,  nr_new_roots		)

	),



	TP_fast_assign(

		__entry->bytenr		= bytenr;

		__entry->num_bytes	= num_bytes;

		__entry->nr_old_roots	= nr_old_roots;

		__entry->nr_new_roots	= nr_new_roots;

	),



	TP_printk("bytenr = %llu, num_bytes = %llu, nr_old_roots = %llu, "

		  "nr_new_roots = %llu",

		  __entry->bytenr,

		  __entry->num_bytes,

		  __entry->nr_old_roots,

		  __entry->nr_new_roots)

);



TRACE_EVENT(qgroup_update_counters,



	TP_PROTO(u64 qgid, u64 cur_old_count, u64 cur_new_count),



	TP_ARGS(qgid, cur_old_count, cur_new_count),



	TP_STRUCT__entry(

		__field(	u64,  qgid			)

		__field(	u64,  cur_old_count		)

		__field(	u64,  cur_new_count		)

	),



	TP_fast_assign(

		__entry->qgid		= qgid;

		__entry->cur_old_count	= cur_old_count;

		__entry->cur_new_count	= cur_new_count;

	),



	TP_printk("qgid = %llu, cur_old_count = %llu, cur_new_count = %llu",

		  __entry->qgid,

		  __entry->cur_old_count,

		  __entry->cur_new_count)

);



#endif /* _TRACE_BTRFS_H */



/* This part must be outside protection */