Gather statistical information on local caching

configname: CONFIG_NETFS_STATS

Linux Kernel Configuration
└─>File systems
└─>Caches
└─>Gather statistical information on local caching
In linux kernel since version 5.2 (release Date: 2019-07-07)  
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.