btrfs: qgroup: Add new trace point for qgroup data reserve

Now each qgroup reserve for data will has its ftrace event for better
debugging.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 7d5339d..879343c 100644 (file)
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -2516,10 +2516,12 @@ int btrfs_qgroup_reserve_data(struct inode *inode, u64 start, u64 len)
 
        changeset.bytes_changed = 0;
        changeset.range_changed = ulist_alloc(GFP_NOFS);
-
        ret = set_record_extent_bits(&BTRFS_I(inode)->io_tree, start,
                        start + len -1, EXTENT_QGROUP_RESERVED, GFP_NOFS,
                        &changeset);
+       trace_btrfs_qgroup_reserve_data(inode, start, len,
+                                       changeset.bytes_changed,
+                                       QGROUP_RESERVE);
        if (ret < 0)
                goto cleanup;
        ret = qgroup_reserve(root, changeset.bytes_changed);
@@ -2544,6 +2546,7 @@ static int __btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len,
                                       int free)
 {
        struct extent_changeset changeset;
+       int trace_op = QGROUP_RELEASE;
        int ret;
 
        changeset.bytes_changed = 0;
@@ -2557,8 +2560,12 @@ static int __btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len,
        if (ret < 0)
                goto out;
 
-       if (free)
+       if (free) {
                qgroup_free(BTRFS_I(inode)->root, changeset.bytes_changed);
+               trace_op = QGROUP_FREE;
+       }
+       trace_btrfs_qgroup_release_data(inode, start, len,
+                                       changeset.bytes_changed, trace_op);
 out:
        ulist_free(changeset.range_changed);
        return ret;

diff --git a/fs/btrfs/qgroup.h b/fs/btrfs/qgroup.h
index adb03da..686b60f 100644 (file)
--- a/fs/btrfs/qgroup.h
+++ b/fs/btrfs/qgroup.h
@@ -33,6 +33,13 @@ struct btrfs_qgroup_extent_record {
        struct ulist *old_roots;
 };
 
+/*
+ * For qgroup event trace points only
+ */
+#define QGROUP_RESERVE         (1<<0)
+#define QGROUP_RELEASE         (1<<1)
+#define QGROUP_FREE            (1<<2)
+
 int btrfs_quota_enable(struct btrfs_trans_handle *trans,
                       struct btrfs_fs_info *fs_info);
 int btrfs_quota_disable(struct btrfs_trans_handle *trans,
@@ -81,6 +88,7 @@ static inline void btrfs_qgroup_free_delayed_ref(struct btrfs_fs_info *fs_info,
                                                 u64 ref_root, u64 num_bytes)
 {
        btrfs_qgroup_free_refroot(fs_info, ref_root, num_bytes);
+       trace_btrfs_qgroup_free_delayed_ref(ref_root, num_bytes);
 }
 void assert_qgroups_uptodate(struct btrfs_trans_handle *trans);
 

diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index 0b73af9..b4473da 100644 (file)
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -1117,6 +1117,119 @@ DEFINE_EVENT(btrfs__workqueue_done, btrfs_workqueue_destroy,
        TP_ARGS(wq)
 );
 
+DECLARE_EVENT_CLASS(btrfs__qgroup_data_map,
+
+       TP_PROTO(struct inode *inode, u64 free_reserved),
+
+       TP_ARGS(inode, free_reserved),
+
+       TP_STRUCT__entry(
+               __field(        u64,            rootid          )
+               __field(        unsigned long,  ino             )
+               __field(        u64,            free_reserved   )
+       ),
+
+       TP_fast_assign(
+               __entry->rootid         =       BTRFS_I(inode)->root->objectid;
+               __entry->ino            =       inode->i_ino;
+               __entry->free_reserved  =       free_reserved;
+       ),
+
+       TP_printk("rootid=%llu, ino=%lu, free_reserved=%llu",
+                 __entry->rootid, __entry->ino, __entry->free_reserved)
+);
+
+DEFINE_EVENT(btrfs__qgroup_data_map, btrfs_qgroup_init_data_rsv_map,
+
+       TP_PROTO(struct inode *inode, u64 free_reserved),
+
+       TP_ARGS(inode, free_reserved)
+);
+
+DEFINE_EVENT(btrfs__qgroup_data_map, btrfs_qgroup_free_data_rsv_map,
+
+       TP_PROTO(struct inode *inode, u64 free_reserved),
+
+       TP_ARGS(inode, free_reserved)
+);
+
+#define BTRFS_QGROUP_OPERATIONS                                \
+       { QGROUP_RESERVE,       "reserve"       },      \
+       { QGROUP_RELEASE,       "release"       },      \
+       { QGROUP_FREE,          "free"          }
+
+DECLARE_EVENT_CLASS(btrfs__qgroup_rsv_data,
+
+       TP_PROTO(struct inode *inode, u64 start, u64 len, u64 reserved, int op),
+
+       TP_ARGS(inode, start, len, reserved, op),
+
+       TP_STRUCT__entry(
+               __field(        u64,            rootid          )
+               __field(        unsigned long,  ino             )
+               __field(        u64,            start           )
+               __field(        u64,            len             )
+               __field(        u64,            reserved        )
+               __field(        int,            op              )
+       ),
+
+       TP_fast_assign(
+               __entry->rootid         = BTRFS_I(inode)->root->objectid;
+               __entry->ino            = inode->i_ino;
+               __entry->start          = start;
+               __entry->len            = len;
+               __entry->reserved       = reserved;
+               __entry->op             = op;
+       ),
+
+       TP_printk("root=%llu, ino=%lu, start=%llu, len=%llu, reserved=%llu, op=%s",
+                 __entry->rootid, __entry->ino, __entry->start, __entry->len,
+                 __entry->reserved,
+                 __print_flags((unsigned long)__entry->op, "",
+                               BTRFS_QGROUP_OPERATIONS)
+       )
+);
+
+DEFINE_EVENT(btrfs__qgroup_rsv_data, btrfs_qgroup_reserve_data,
+
+       TP_PROTO(struct inode *inode, u64 start, u64 len, u64 reserved, int op),
+
+       TP_ARGS(inode, start, len, reserved, op)
+);
+
+DEFINE_EVENT(btrfs__qgroup_rsv_data, btrfs_qgroup_release_data,
+
+       TP_PROTO(struct inode *inode, u64 start, u64 len, u64 reserved, int op),
+
+       TP_ARGS(inode, start, len, reserved, op)
+);
+
+DECLARE_EVENT_CLASS(btrfs__qgroup_delayed_ref,
+
+       TP_PROTO(u64 ref_root, u64 reserved),
+
+       TP_ARGS(ref_root, reserved),
+
+       TP_STRUCT__entry(
+               __field(        u64,            ref_root        )
+               __field(        u64,            reserved        )
+       ),
+
+       TP_fast_assign(
+               __entry->ref_root       = ref_root;
+               __entry->reserved       = reserved;
+       ),
+
+       TP_printk("root=%llu, reserved=%llu, op=free",
+                 __entry->ref_root, __entry->reserved)
+);
+
+DEFINE_EVENT(btrfs__qgroup_delayed_ref, btrfs_qgroup_free_delayed_ref,
+
+       TP_PROTO(u64 ref_root, u64 reserved),
+
+       TP_ARGS(ref_root, reserved)
+);
 #endif /* _TRACE_BTRFS_H */
 
 /* This part must be outside protection */