Gather statistical information on local caching

configname: CONFIG_FSCACHE_STATS

Linux Kernel Configuration
└─>File systems
└─>Caches
└─>Gather statistical information on local caching
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
This option causes statistical information to be gathered on local
caching and exported through file:

/proc/fs/fscache/stats

The gathering of statistics adds a certain amount of overhead to
execution as there are a quite a few stats gathered, and on a
multi-CPU system these may be on cachelines that keep bouncing
between CPUs. On the other hand, the stats are very useful for
debugging purposes. Saying 'Y' here is recommended.

See Documentation/filesystems/caching/fscache.txt for more information.