perf: cache per-CPU slot pointer in per-arch registers and drop the percpu crate - #392

Draft

agicy wants to merge 8 commits into

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perf/per-cpu-register-cache

Commits on Sep 2, 2026

feat(aarch64): cache per-CPU slot pointer in TPIDR_EL2
agicy
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4ca8827
feat(x86_64): cache per-CPU slot pointer in IA32_GS_BASE
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bdc3e73
feat(loongarch64): cache per-CPU slot pointer in root CSR SAVE0
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ba468dc
feat(riscv64): container_of PerCpu slot base from sscratch
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72364b9
refactor: replace percpu def_percpu queues with plain arrays
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c0966a7
remove: drop percpu crate and its .percpu link-time sections
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4af2844
docs: record per-CPU register cache invariants and changelog entry
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915f880
perf(aarch64): drop dead per-exit MPIDR lookup in arch_handle_exit
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b2230ac