The kernel's this_cpu
operations are meant to speed access to per-CPU variables. They are
more optimal on some CPUs than others, though. During a memory-management-track session at the 2026 Linux Storage,
Filesystem, Memory Management, and BPF Summit, Yang Shi proposed a
fundamental, and somewhat controversial, change to how these operations
work in order to provide better performance on a wider range of architectures.

https://lwn.net/Articles/1073395/
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