There are many places in the kernel where performance can be improved by
using per-CPU data. But, as it turns out, the kernel's allocator for
per-CPU data has some performance problems of its own. Harry Yoo led a
session in the memory-management track of the 2026 Linux Storage,
Filesystem, Memory Management, and BPF Summit to explore ways to
address those problems and accelerate the allocation and initialization of per-CPU data.

https://lwn.net/Articles/1072840/
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