default or selected kernelversion does not have config value CONFIG_CACHEFILES_HISTOGRAM.
Result is shown for kernelversion 6.9.9
Gather latency information on CacheFiles
configname: CONFIG_CACHEFILES_HISTOGRAM
Linux Kernel Configuration
└─>File systems
└─>Caches
└─>Gather latency information on CacheFiles
In linux kernel since version 2.6.30 (release Date: 2009-06-09)
This option causes latency information to be gathered on CacheFiles
operation and exported through file:
/proc/fs/cachefiles/histogram
The generation of this histogram adds a certain amount of overhead to
execution as there are a number of points at which data is gathered,
and on a multi-CPU system these may be on cachelines that keep
bouncing between CPUs. On the other hand, the histogram may be
useful for debugging purposes. Saying 'N' here is recommended.
See Documentation/filesystems/caching/cachefiles.txt for more
information.
operation and exported through file:
/proc/fs/cachefiles/histogram
The generation of this histogram adds a certain amount of overhead to
execution as there are a number of points at which data is gathered,
and on a multi-CPU system these may be on cachelines that keep
bouncing between CPUs. On the other hand, the histogram may be
useful for debugging purposes. Saying 'N' here is recommended.
See Documentation/filesystems/caching/cachefiles.txt for more
information.