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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 /kernel/locking | |
| parent | 0185f364cb65855cdf5dfd0de11f8f9622940250 (diff) | |
| download | linux-480b9b4d847fe18f4a559f5cac718d9b2cbcdcaf.tar.bz2 | |
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 'kernel/locking')
0 files changed, 0 insertions, 0 deletions