今日重点：🗣️ 口语——今天练「说」：先跟读一段真实英文，再合上原文用自己的话复述。素材是 linux-mm 的 swap per-priority 队列系列（RESEND RFC v2 cover letter）的真实原文。

🗣️ 口语：朗读 → 拆意群 → 复述

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口语练习分三步：① 大声朗读——把一段真实英文读顺；② 拆意群——把长句按语义切成小块，搞清每块讲什么；③ 复述——合上原文，用自己的话把意思讲出来（不必逐字）。下面这段来自 swap 系列 cover letter，讲「为什么用优先级队列替掉 plist 轮转」，结构清晰、很适合开口练。

★ 真实原文：一段可以反复跟读的设计说明

linux-mm · [RESEND RFC PATCH v2 00/13] mm/swap: introduce per-priority allocation queues

英文原段 This series first restores per-device percpu clusters, then replaces the allocation-time plist rotation with a priority-ordered queue. Each priority has a mostly immutable ring of devices. Per-CPU readers rotate within a ring after a fixed allocation quota, so the allocator preserves strict priority ordering without contending on one global rotation point.
中文理解 「这个系列先恢复每设备的 percpu 簇，再把分配期的 plist 轮转换成按优先级排序的队列。每个优先级有一条基本不变的设备环。每个 CPU 的读者在分配固定配额后在环内轮转，因此分配器能保持严格的优先级顺序，而不用在单一全局轮转点上争抢。」
朗读要点（拆意群） 第一句按「先…再…」断：This series first restores per-device percpu clusters, ‖ then replaces the allocation-time plist rotation ‖ with a priority-ordered queue. 第二句按「动作→时机→目的」断：Per-CPU readers rotate within a ring ‖ after a fixed allocation quota, ‖ so the allocator preserves strict priority ordering ‖ without contending on one global rotation point. 重音落在 strict priority ordering（严格优先级）和 without contending（不争抢）上。

🔗 原文

✨ 辅助彩蛋（术语卡）

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★ percpu cluster / plist / swap tier：一句话说清

术语卡 · swap 分配器语境

per-device percpu cluster 每个 swap 设备独立维护的、按 CPU 划分的分配簇——让各 CPU 优先从自己附近的簇拿页，减少跨 CPU 争抢（原句 restores per-device percpu clusters）。
plist_requeue 内核 priority list（优先级链表）的重新入队操作。旧分配器靠它把设备按优先级在链上挪动，新设计用「优先级有序队列」替掉它（原句 replaces the allocation-time plist rotation）。
swap tier swap 分层：把不同速度的 swap 设备分成 tier（快盘一档、慢盘一档）。原句预告队列以后能变成分层内的分配策略——If tiers land first, the same queue can become an in-tier allocation policy rather than a competing tier definition.

🔗 原文

✍️ 今日练习

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✍️ 口语任务：① 先把原文段朗读一遍（出声，60 秒）；② 合上原文，用 2~3 句英文向别人复述这个系列做了什么。提示线索：restore percpu clusters → replace plist rotation with priority-ordered queue → each priority has a ring of devices → readers rotate after a quota, no global contention。
💡 显示答案
参考复述（仿写示范，非原句）：This series restores per-device percpu clusters, and then replaces the old plist rotation with a priority-ordered queue. Every priority level has its own ring of devices. Each CPU reads from the ring, rotates after a quota, and that keeps strict priority ordering without a single global lock being contended.
📖 原文：This series first restores per-device percpu clusters, then replaces the allocation-time plist rotation with a priority-ordered queue. Each priority has a mostly immutable ring of devices. Per-CPU readers rotate within a ring after a fixed allocation quota, so the allocator preserves strict priority ordering without contending on one global rotation point.
📎 原文引用

Read it aloud once, then say it in your own words — speaking is thinking out loud.

内核英语 · 每日一篇