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Linux 7.0 内存管理带来性能优化

  • 2026-02-27 02:54:32
Linux 7.0 内存管理带来性能优化

Linux 7.0 内存管理带来性能优化 🚀

Andrew Morton 早些时候发布了所有的内存管理补丁，随后 Linus Torvalds 将其合并到 Linux 7.0 中，这些补丁主要围绕 Linux 内核的性能改进展开。
🔹 引入了对 Zram 的压缩数据回写支持，有助于节省CPU功耗，尤其在笔记本电脑上能提升能效。之前不够理想的未压缩回写方式，现在已被更优的压缩数据回写方式取代。
🔹 为大页清除连续的页范围，对于 2MB 页以及更大页大小的请求缺页都能带来显著改善。
🔹 通过两种方式改进了当前的非连续清理方法，以连续的方式清理页面以及在所有可使用的地方通过 clear_pages() 进行批量清理。
🔹 连续的方式清理页面能让我们更好地利用硬件预取器，而批量清理能够向处理器告知实际范围。在特定指令支持的情况下，处理器可以基于此进行优化，因为它看到的是一个更大的操作单元，而非一连串的 8 字节存储或一连串的 4KB 页面。
🔹 加速巨型页框分配，通过避免不必要的工作，极大地加快了巨型页框的分配速度。作为参考，120 个 1G 页框的分配时间从 3.605 秒降至仅 0.431 秒。
🔹 统一换入使用，并移除了一些性能不佳的旧交换代码。这些清理和改进使 Redis 基准测试的速度提升了 20%。
🔹 扩展了 PT_RECLAIM 的支持范围，使其涵盖了包括 Alpha、龙芯、MIPS、Parisc 和 UM。
💭 这一系列针对内存管理底层的优化和代码重构，大幅缩短了特定任务的处理时间，为不同架构的设备带来了更出色的性能表现。
#内存管理 #Linux内核 #Linux

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      1. CONNECT:[ UseTime:0.000494s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
      2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000566s ]
      3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000265s ]
      4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000283s ]
      5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000520s ]
      6. SELECT * FROM `set` [ RunTime:0.000203s ]
      7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000575s ]
      8. SELECT * FROM `article` WHERE `id` = 476243 LIMIT 1 [ RunTime:0.010723s ]
      9. UPDATE `article` SET `lasttime` = 1772253417 WHERE `id` = 476243 [ RunTime:0.000900s ]
      10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000248s ]
      11. SELECT * FROM `article` WHERE `id` < 476243 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001978s ]
      12. SELECT * FROM `article` WHERE `id` > 476243 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008770s ]
      13. SELECT * FROM `article` WHERE `id` < 476243 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006549s ]
      14. SELECT * FROM `article` WHERE `id` < 476243 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.023392s ]
      15. SELECT * FROM `article` WHERE `id` < 476243 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.022659s ]
      0.147886s