btrfs: qgroup: Update trace events for metadata reservation

Now trace_qgroup_meta_reserve() will have extra type parameter. And introduce two new trace events: 1) trace_qgroup_meta_free_all_pertrans() For btrfs_qgroup_free_meta_all_pertrans() 2) trace_qgroup_meta_convert() For btrfs_qgroup_convert_reserved_meta() Signed-off-by: Qu Wenruo <[email protected]> Signed-off-by: David Sterba <[email protected]>
raspberrypi · Mar 31, 2018 · 4ee0d88 · 4ee0d88
1 parent 8287475
commit 4ee0d88
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Showing 2 changed files with 57 additions and 5 deletions.
diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
@@ -3138,7 +3138,7 @@ int __btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes,
 		return 0;
 
 	BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize));
-	trace_qgroup_meta_reserve(root, (s64)num_bytes);
+	trace_qgroup_meta_reserve(root, type, (s64)num_bytes);
 	ret = qgroup_reserve(root, num_bytes, enforce, type);
 	if (ret < 0)
 		return ret;
@@ -3163,7 +3163,7 @@ void btrfs_qgroup_free_meta_all_pertrans(struct btrfs_root *root)
 		return;
 
 	/* TODO: Update trace point to handle such free */
-	trace_qgroup_meta_reserve(root, 0);
+	trace_qgroup_meta_free_all_pertrans(root);
 	/* Special value -1 means to free all reserved space */
 	btrfs_qgroup_free_refroot(fs_info, root->objectid, (u64)-1,
 				  BTRFS_QGROUP_RSV_META_PERTRANS);
@@ -3185,7 +3185,7 @@ void __btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes,
 	 */
 	num_bytes = sub_root_meta_rsv(root, num_bytes, type);
 	BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize));
-	trace_qgroup_meta_reserve(root, -(s64)num_bytes);
+	trace_qgroup_meta_reserve(root, type, -(s64)num_bytes);
 	btrfs_qgroup_free_refroot(fs_info, root->objectid, num_bytes, type);
 }
 
@@ -3245,6 +3245,7 @@ void btrfs_qgroup_convert_reserved_meta(struct btrfs_root *root, int num_bytes)
 	/* Same as btrfs_qgroup_free_meta_prealloc() */
 	num_bytes = sub_root_meta_rsv(root, num_bytes,
 				      BTRFS_QGROUP_RSV_META_PREALLOC);
+	trace_qgroup_meta_convert(root, num_bytes);
 	qgroup_convert_meta(fs_info, root->objectid, num_bytes);
 }
 

diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
@@ -1663,22 +1663,73 @@ TRACE_EVENT(qgroup_update_reserve,
 
 TRACE_EVENT(qgroup_meta_reserve,
 
+	TP_PROTO(struct btrfs_root *root, s64 diff, int type),
+
+	TP_ARGS(root, diff, type),
+
+	TP_STRUCT__entry_btrfs(
+		__field(	u64,	refroot			)
+		__field(	s64,	diff			)
+		__field(	int,	type			)
+	),
+
+	TP_fast_assign_btrfs(root->fs_info,
+		__entry->refroot	= root->objectid;
+		__entry->diff		= diff;
+	),
+
+	TP_printk_btrfs("refroot=%llu(%s) type=%s diff=%lld",
+		show_root_type(__entry->refroot),
+		show_qgroup_rsv_type(__entry->type), __entry->diff)
+);
+
+TRACE_EVENT(qgroup_meta_convert,
+
 	TP_PROTO(struct btrfs_root *root, s64 diff),
 
 	TP_ARGS(root, diff),
 
 	TP_STRUCT__entry_btrfs(
 		__field(	u64,	refroot			)
 		__field(	s64,	diff			)
+		__field(	int,	type			)
 	),
 
 	TP_fast_assign_btrfs(root->fs_info,
 		__entry->refroot	= root->objectid;
 		__entry->diff		= diff;
 	),
 
-	TP_printk_btrfs("refroot=%llu(%s) diff=%lld",
-		show_root_type(__entry->refroot), __entry->diff)
+	TP_printk_btrfs("refroot=%llu(%s) type=%s->%s diff=%lld",
+		show_root_type(__entry->refroot),
+		show_qgroup_rsv_type(BTRFS_QGROUP_RSV_META_PREALLOC),
+		show_qgroup_rsv_type(BTRFS_QGROUP_RSV_META_PERTRANS),
+		__entry->diff)
+);
+
+TRACE_EVENT(qgroup_meta_free_all_pertrans,
+
+	TP_PROTO(struct btrfs_root *root),
+
+	TP_ARGS(root),
+
+	TP_STRUCT__entry_btrfs(
+		__field(	u64,	refroot			)
+		__field(	s64,	diff			)
+		__field(	int,	type			)
+	),
+
+	TP_fast_assign_btrfs(root->fs_info,
+		__entry->refroot	= root->objectid;
+		spin_lock(&root->qgroup_meta_rsv_lock);
+		__entry->diff		= -(s64)root->qgroup_meta_rsv_pertrans;
+		spin_unlock(&root->qgroup_meta_rsv_lock);
+		__entry->type		= BTRFS_QGROUP_RSV_META_PERTRANS;
+	),
+
+	TP_printk_btrfs("refroot=%llu(%s) type=%s diff=%lld",
+		show_root_type(__entry->refroot),
+		show_qgroup_rsv_type(__entry->type), __entry->diff)
 );
 
 DECLARE_EVENT_CLASS(btrfs__prelim_ref,