Btrfs debugging support

configname: CONFIG_BTRFS_DEBUG

Linux Kernel Configuration
└─>File systems
└─>Btrfs debugging support
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Enable run-time debugging support for the btrfs filesystem.

Additional potentially expensive checks, debugging functionality or
sysfs exported information is enabled, like leak checks of internal
objects, optional forced space fragmentation and /sys/fs/btrfs/debug .
This has negative impact on performance.

If unsure, say N.