CONFIG_HOST_VMSPLIT_3G_OPT is not available for thedefaultarchitecture x86.
Result is shown for architecture um
default or selected kernelversion does not have config value CONFIG_HOST_VMSPLIT_3G_OPT.
Result is shown for kernelversion 5.15.113

3G/1G user/kernel host split (for full 1G low memory)

configname: CONFIG_HOST_VMSPLIT_3G_OPT

Host memory split
└─>3G/1G user/kernel host split (for full 1G low memory)
In linux kernel since version 2.6.19 (release Date: 2006-11-29)