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| author |   Qu Wenruo <wqu@suse.com> | 2019-04-29 14:03:33 +0800 |
|---|---|---|
| committer |   David Sterba <dsterba@suse.com> | 2019-07-01 13:34:58 +0200 |
| commit | 480b9b4d847fe18f4a559f5cac718d9b2cbcdcaf (patch) | |
| tree | 64b408190754b7133820c21f44eb4ed4348d1bf7 /include/trace | |
| parent | btrfs: extent-tree: Add lockdep assert when updating space info (diff) | |
| download | linux-dev-480b9b4d847fe18f4a559f5cac718d9b2cbcdcaf.tar.xz linux-dev-480b9b4d847fe18f4a559f5cac718d9b2cbcdcaf.zip | |
btrfs: extent-tree: Add trace events for space info numbers update
Add trace event for update_bytes_pinned() and update_bytes_may_use() to
detect underflow better.
The output would be something like (only showing data part):
## Buffered write start, 16K total ##
2255.954 xfs_io/860 btrfs:update_bytes_may_use:(nil)U: type=DATA old=0 diff=4096
2257.169 sudo/860 btrfs:update_bytes_may_use:(nil)U: type=DATA old=4096 diff=4096
2257.346 sudo/860 btrfs:update_bytes_may_use:(nil)U: type=DATA old=8192 diff=4096
2257.542 sudo/860 btrfs:update_bytes_may_use:(nil)U: type=DATA old=12288 diff=4096
## Delalloc start ##
3727.853 kworker/u8:3-e/700 btrfs:update_bytes_may_use:(nil)U: type=DATA old=16384 diff=-16384
## Space cache update ##
3733.132 sudo/862 btrfs:update_bytes_may_use:(nil)U: type=DATA old=0 diff=65536
3733.169 sudo/862 btrfs:update_bytes_may_use:(nil)U: type=DATA old=65536 diff=-65536
3739.868 sudo/862 btrfs:update_bytes_may_use:(nil)U: type=DATA old=0 diff=65536
3739.891 sudo/862 btrfs:update_bytes_may_use:(nil)U: type=DATA old=65536 diff=-65536
These two trace events will allow bcc tool to probe btrfs_space_info
changes and detect underflow with more details (e.g. backtrace for each
update).
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'include/trace')
| -rw-r--r-- | include/trace/events/btrfs.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h index f9eff010fc7e..2f6a669408bb 100644 --- a/include/trace/events/btrfs.h +++ b/include/trace/events/btrfs.h @@ -29,6 +29,7 @@ struct btrfs_qgroup_extent_record; struct btrfs_qgroup; struct extent_io_tree; struct prelim_ref; +struct btrfs_space_info; TRACE_DEFINE_ENUM(FLUSH_DELAYED_ITEMS_NR); TRACE_DEFINE_ENUM(FLUSH_DELAYED_ITEMS); @@ -2091,6 +2092,45 @@ DEFINE_BTRFS_LOCK_EVENT(btrfs_try_tree_read_lock); DEFINE_BTRFS_LOCK_EVENT(btrfs_try_tree_write_lock); DEFINE_BTRFS_LOCK_EVENT(btrfs_tree_read_lock_atomic); +DECLARE_EVENT_CLASS(btrfs__space_info_update, + + TP_PROTO(struct btrfs_fs_info *fs_info, + struct btrfs_space_info *sinfo, u64 old, s64 diff), + + TP_ARGS(fs_info, sinfo, old, diff), + + TP_STRUCT__entry_btrfs( + __field( u64, type ) + __field( u64, old ) + __field( s64, diff ) + ), + + TP_fast_assign_btrfs(fs_info, + __entry->type = sinfo->flags; + __entry->old = old; + __entry->diff = diff; + ), + TP_printk_btrfs("type=%s old=%llu diff=%lld", + __print_flags(__entry->type, "|", BTRFS_GROUP_FLAGS), + __entry->old, __entry->diff) +); + +DEFINE_EVENT(btrfs__space_info_update, update_bytes_may_use, + + TP_PROTO(struct btrfs_fs_info *fs_info, + struct btrfs_space_info *sinfo, u64 old, s64 diff), + + TP_ARGS(fs_info, sinfo, old, diff) +); + +DEFINE_EVENT(btrfs__space_info_update, update_bytes_pinned, + + TP_PROTO(struct btrfs_fs_info *fs_info, + struct btrfs_space_info *sinfo, u64 old, s64 diff), + + TP_ARGS(fs_info, sinfo, old, diff) +); + #endif /* _TRACE_BTRFS_H */ /* This part must be outside protection */ |