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LoGin
c2ba5d209e
* refactor(rcu): segment callback queues per CPU Replace the globally serialized callback tracker and FIFO with cache-line-aligned per-CPU queues split into done, wait, next-ready, and next segments. Keep raw callback admission allocation-free and restrict its shared work to the local queue plus a coalesced worker kick. Advance callback generations as whole segments, execute bounded round-robin batches outside RCU locks, and implement rcu_barrier() with per-CPU tail markers that cover queued and executing callbacks. Serialize barrier scans with CPU lifecycle migration while preserving the upstream participating-CPU state as the single hotplug authority. Add per-CPU callback queue debugfs snapshots and extend RCU selftests for segment transitions, migration, callback requeue, multi-batch floods, all-online-CPU admission, concurrent barriers, and the upstream CPU lifecycle protocol. Tests: make kernel Tests: make run-nographic (2 vCPUs) Tests: /opt/tests/dunitest/bin/normal/rcu_selftest_test (3/3 passed) Signed-off-by: longjin <longjin@dragonos.org> * docs(rcu): document segmented callback queues Explain the per-CPU four-segment callback model, grace-period advancement, bounded execution, barrier markers, CPU lifecycle migration, and concurrency invariants without coupling the design to issue history or implementation details. Add a matching English translation and register both documents in their respective RCU documentation indexes. Signed-off-by: longjin <longjin@dragonos.org> * docs(rcu): clarify callback lifecycle Update the Chinese and English RCU architecture overviews with the per-CPU segmented callback lifecycle, its ordering boundaries, and the distinction between grace-period waits and callback barriers. Keep the overview concise and link both languages to the detailed segmented callback queue design. Signed-off-by: longjin <longjin@dragonos.org> * style(rcu): format callback imports Signed-off-by: longjin <longjin@dragonos.org> * fix(rcu): hand off barriers when worker exits Wake barrier waiters unconditionally after publishing that the callback worker has stopped. This lets a barrier that observed the old worker state recheck its predicate and take over bounded inline execution instead of sleeping forever with queued markers. Drain a small per-CPU callback quantum before resuming round-robin selection. This avoids rescanning every possible CPU for each callback in a single-CPU backlog while preserving a strict fairness bound for other CPUs. Tests: make fmt Tests: make kernel Tests: make run-nographic Tests: dunitest normal/rcu_selftest (3/3 passed) Signed-off-by: longjin <longjin@dragonos.org> --------- Signed-off-by: longjin <longjin@dragonos.org>