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Linux屠龙术碎碎练-1T物理内存的映射

  • 2026-06-29 20:41:45
Linux屠龙术碎碎练-1T物理内存的映射
在64位Linux内核启动时，会把所有物理内存一次性映射到内核线性地址空间，目的是让内核可以随时、直接、高效地访问任意物理页，保证伙伴系统、slab、驱动、中断等所有内核内存操作无需动态建页表、不触发缺页、不阻塞，从而保证内核稳定、高效运行。
但是如果系统配置了1T的物理内存，如果用4K的Page，则页表项将消耗大量空间，所以在内核设置映射的时候可以用HugePage，比如1G的Page，这样页表项所占空间将大大减少：
页大小
页表项数量
页表本身占用内存
4KB
~2.68 亿
2GB
2MB
52 万
4MB
1GB
1024
8KB

虽然页表项大大减少了，但是每个struct page依然是描述的4K的Page，它们组成mem_map的巨型数组，这个数组的空间会非常大：16G，如下：

物理内存
4KB 页数
struct page 总大小
1GB
262,144
16MB
32GB
8,388,608
512MB
128GB
33,554,432
2GB
1TB268,435,45616GB

内核空间映射设置为1G的Page，那么__get_free_pages分配一个4K的空间，会有影响吗？没有，就如前面所所，因为伙伴系统内存分配基于struct page，也就是4K的Page来分配的。

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  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000816s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001173s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000609s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000459s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000966s ]
  6. SELECT * FROM `set` [ RunTime:0.000412s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000968s ]
  8. SELECT * FROM `article` WHERE `id` = 488224 LIMIT 1 [ RunTime:0.000671s ]
  9. UPDATE `article` SET `lasttime` = 1783134341 WHERE `id` = 488224 [ RunTime:0.026847s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.004970s ]
  11. SELECT * FROM `article` WHERE `id` < 488224 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000870s ]
  12. SELECT * FROM `article` WHERE `id` > 488224 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000808s ]
  13. SELECT * FROM `article` WHERE `id` < 488224 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002051s ]
  14. SELECT * FROM `article` WHERE `id` < 488224 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001359s ]
  15. SELECT * FROM `article` WHERE `id` < 488224 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005223s ]
0.165053s