You will find this specific kernel on devices released approximately between . It was a popular choice for mid-range to flagship devices running Android 10 (Q) and Android 11 (R).
Modern 4.14-perf kernels use a scheduler that knows the battery level. If your battery is below 15%, the -perf kernel might silently reduce the max CPU frequency to save power. If the battery is cool and full, it allows "boost" frequencies. 4.14.190-perf
The number 190 refers to the or patch level . In the Linux world, a kernel goes through hundreds of minor revisions. Starting from 4.14.0 , each subsequent number adds bug fixes, driver updates, and security patches. You will find this specific kernel on devices
As of 2025, the 4.14 branch is reaching end-of-life (EOL) for many upstream maintainers. Device manufacturers are pushing newer devices to kernel 5.4 , 5.10 , or 5.15 . If your battery is below 15%, the -perf