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: Mark Fasheh <mfasheh@suse.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 7173360eea7a8c8a6e4b8280a1d40b2e6e46697b..9e119552ed32cb4236eb3933fb9e7e9d104b77af 100644 (file)
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -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

diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index d866f21efbbfd4722e6c23bde8320d7b54ecf2be..467a4d205ff640e357ec68b48b712bb22fba15e6 100644 (file)
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -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 */