Debug CacheFiles

configname: CONFIG_CACHEFILES_DEBUG

Linux Kernel Configuration
└─>File systems
└─>Caches
└─>Debug CacheFiles
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
This permits debugging to be dynamically enabled in the filesystem
caching on files module. If this is set, the debugging output may be
enabled by setting bits in /sys/modules/cachefiles/parameter/debug or
by including a debugging specifier in /etc/cachefilesd.conf.