Dump Linux kernel and process page table
-v0.1 2020.12.31 Sherlock init
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dump 内核页表
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打开内核编译选项：CONFIG_PTDUMP_CORE, CONFIG_PTDUMP_DEBUGFS, 编译内核。
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在/sys/kernel/debug/kernel_page_tables下可以dump kernel page table。dump
出的数据大概如下:
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0x0000000000000000-0xffff000000000000 16776960T PGD
0xffff000000000000-0xffff0000002dd000 2932K PTE RW NX SHD AF UXN MEM/NORMAL-TAGGED
0xffff0000002dd000-0xffff0000002de000 4K PTE ro NX SHD AF UXN MEM/NORMAL-TAGGED
0xffff0000002de000-0xffff00002d800000 742536K PTE RW NX SHD AF UXN MEM/NORMAL-TAGGED
0xffff00002d800000-0xffff00002f200000 26M PMD ro NX SHD AF BLK UXN MEM/NORMAL
0xffff00002f200000-0xffff00002f3a0000 1664K PTE ro NX SHD AF UXN MEM/NORMAL
0xffff00002f3a0000-0xffff0000385ec000 149808K PTE RW NX SHD AF UXN MEM/NORMAL-TAGGED
0xffff0000385ec000-0xffff0000386c0000 848K PTE
0xffff0000386c0000-0xffff0000386e0000 128K PTE RW NX SHD AF UXN MEM/NORMAL-TAGGED
0xffff0000386e0000-0xffff000038750000 448K PTE
0xffff000038750000-0xffff00003bc20000 54080K PTE RW NX SHD AF UXN MEM/NORMAL-TAGGED
0xffff00003bc20000-0xffff00003be00000 1920K PTE
0xffff00003be00000-0xffff00003c000000 2M PMD
0xffff00003c000000-0xffff000040000000 64M PTE RW NX SHD AF UXN MEM/NORMAL-TAGGED
0xffff000040000000-0xffff008000000000 511G PUD
0xffff008000000000-0xffff800000000000 130560G PGD
---[ Linear Mapping end ]---
---[ BPF start ]---
0xffff800000000000-0xffff800000001000 4K PTE ro x SHD AF UXN MEM/NORMAL
0xffff800000001000-0xffff800000200000 2044K PTE
0xffff800000200000-0xffff800008000000 126M PMD
---[ BPF end ]---
---[ Modules start ]---
0xffff800008000000-0xffff800010000000 128M PMD
---[ Modules end ]---
---[ vmalloc() area ]---
0xffff800010000000-0xffff800011200000 18M PMD ro x SHD AF BLK UXN MEM/NORMAL
0xffff800011200000-0xffff800011240000 256K PTE ro x SHD AF CON UXN MEM/NORMAL
0xffff800011240000-0xffff800011400000 1792K PTE ro NX SHD AF UXN MEM/NORMAL
0xffff800011400000-0xffff800011a00000 6M PMD ro NX SHD AF BLK UXN MEM/NORMAL
0xffff800011a00000-0xffff800011ba0000 1664K PTE ro NX SHD AF UXN MEM/NORMAL
0xffff800011ba0000-0xffff800011e00000 2432K PTE
0xffff800011e00000-0xffff800012400000 6M PMD
0xffff800012400000-0xffff8000125d0000 1856K PTE
0xffff8000125d0000-0xffff800012600000 192K PTE RW NX SHD AF CON UXN MEM/NORMAL
0xffff800012600000-0xffff800012a00000 4M PMD RW NX SHD AF BLK UXN MEM/NORMAL
0xffff800012a00000-0xffff800012b90000 1600K PTE RW NX SHD AF CON UXN MEM/NORMAL
0xffff800012b90000-0xffff800012b91000 4K PTE
0xffff800012b91000-0xffff800012b92000 4K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012b92000-0xffff800012b93000 4K PTE
0xffff800012b93000-0xffff800012b94000 4K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012b94000-0xffff800012b95000 4K PTE
0xffff800012b95000-0xffff800012b96000 4K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012b96000-0xffff800012b98000 8K PTE
0xffff800012b98000-0xffff800012b9c000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012b9c000-0xffff800012b9d000 4K PTE
0xffff800012b9d000-0xffff800012b9e000 4K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xffff800012b9e000-0xffff800012ba0000 8K PTE
0xffff800012ba0000-0xffff800012bb0000 64K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xffff800012bb0000-0xffff800012bb1000 4K PTE
0xffff800012bb1000-0xffff800012bb2000 4K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012bb2000-0xffff800012bb3000 4K PTE
0xffff800012bb3000-0xffff800012bb4000 4K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012bb4000-0xffff800012bb8000 16K PTE
0xffff800012bb8000-0xffff800012bbc000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012bbc000-0xffff800012bc0000 16K PTE
0xffff800012bc0000-0xffff800012bd0000 64K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xffff800012bd0000-0xffff800012bd8000 32K PTE
0xffff800012bd8000-0xffff800012bdc000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012bdc000-0xffff800012be0000 16K PTE
0xffff800012be0000-0xffff800012be4000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012be4000-0xffff800012be8000 16K PTE
0xffff800012be8000-0xffff800012bec000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012bec000-0xffff800012bf0000 16K PTE
0xffff800012bf0000-0xffff800012bf4000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012bf4000-0xffff800012bf8000 16K PTE
0xffff800012bf8000-0xffff800012bfc000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012bfc000-0xffff800012c00000 16K PTE
0xffff800012c00000-0xffff800012c04000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012c04000-0xffff800012c08000 16K PTE
0xffff800012c08000-0xffff800012c0c000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012c0c000-0xffff800012c10000 16K PTE
0xffff800012c10000-0xffff800012c14000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012c14000-0xffff800012c18000 16K PTE
0xffff800012c18000-0xffff800012c1c000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012c1c000-0xffff800012c20000 16K PTE
0xffff800012c20000-0xffff800012c24000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012c24000-0xffff800012c28000 16K PTE
0xffff800012c28000-0xffff800012c2c000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012c2c000-0xffff800012c30000 16K PTE
0xffff800012c30000-0xffff800012c34000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012c34000-0xffff800012c38000 16K PTE
0xffff800012c38000-0xffff800012c3c000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012c3c000-0xffff800012c40000 16K PTE
0xffff800012c40000-0xffff800012c44000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012c44000-0xffff800012c48000 16K PTE
0xffff800012c48000-0xffff800012c4c000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012c4c000-0xffff800012c50000 16K PTE
0xffff800012c50000-0xffff800012c54000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012c54000-0xffff800012c55000 4K PTE
0xffff800012c55000-0xffff800012c75000 128K PTE RW NX SHD AF UXN MEM/NORMAL-NC
0xffff800012c75000-0xffff800012c76000 4K PTE
0xffff800012c76000-0xffff800012c96000 128K PTE RW NX SHD AF UXN MEM/NORMAL-NC
0xffff800012c96000-0xffff800012c97000 4K PTE
0xffff800012c97000-0xffff800012cb7000 128K PTE RW NX SHD AF UXN MEM/NORMAL-NC
0xffff800012cb7000-0xffff800012cb8000 4K PTE
0xffff800012cb8000-0xffff800012cbc000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012cbc000-0xffff800012cc0000 16K PTE
0xffff800012cc0000-0xffff800012cc4000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012cc4000-0xffff800012cc8000 16K PTE
0xffff800012cc8000-0xffff800012ccc000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012ccc000-0xffff800012cd0000 16K PTE
0xffff800012cd0000-0xffff800012cd4000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012cd4000-0xffff800012cd8000 16K PTE
0xffff800012cd8000-0xffff800012cdc000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012cdc000-0xffff800012ce0000 16K PTE
0xffff800012ce0000-0xffff800012ce4000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012ce4000-0xffff800012ce8000 16K PTE
0xffff800012ce8000-0xffff800012cec000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012cec000-0xffff800012cf0000 16K PTE
0xffff800012cf0000-0xffff800012cf4000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012cf4000-0xffff800012cf8000 16K PTE
0xffff800012cf8000-0xffff800012cfc000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800012cfc000-0xffff800013000000 3088K PTE
0xffff800013000000-0xffff800013f60000 15744K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xffff800013f60000-0xffff800013fb0000 320K PTE
0xffff800013fb0000-0xffff800013fb4000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800013fb4000-0xffff800013fbd000 36K PTE
0xffff800013fbd000-0xffff800013fbe000 4K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xffff800013fbe000-0xffff800013fc0000 8K PTE
0xffff800013fc0000-0xffff800013fc4000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800013fc4000-0xffff800013fc5000 4K PTE
0xffff800013fc5000-0xffff800013fc6000 4K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xffff800013fc6000-0xffff800013fc8000 8K PTE
0xffff800013fc8000-0xffff800013fcc000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800013fcc000-0xffff800013fcd000 4K PTE
0xffff800013fcd000-0xffff800013fce000 4K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xffff800013fce000-0xffff800013fd0000 8K PTE
0xffff800013fd0000-0xffff800013fd4000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800013fd4000-0xffff800013fd5000 4K PTE
0xffff800013fd5000-0xffff800013fd6000 4K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xffff800013fd6000-0xffff800013fd8000 8K PTE
0xffff800013fd8000-0xffff800013fdc000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800013fdc000-0xffff800013fdd000 4K PTE
0xffff800013fdd000-0xffff800013fde000 4K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xffff800013fde000-0xffff800013fe0000 8K PTE
0xffff800013fe0000-0xffff800013fe4000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800013fe4000-0xffff800013fe5000 4K PTE
0xffff800013fe5000-0xffff800013fe6000 4K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xffff800013fe6000-0xffff800013fe8000 8K PTE
0xffff800013fe8000-0xffff800013fec000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800013fec000-0xffff800013fed000 4K PTE
0xffff800013fed000-0xffff800013fee000 4K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xffff800013fee000-0xffff800013ff0000 8K PTE
0xffff800013ff0000-0xffff800013ff4000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800013ff4000-0xffff800013ff5000 4K PTE
0xffff800013ff5000-0xffff800013ff6000 4K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xffff800013ff6000-0xffff800013ff8000 8K PTE
0xffff800013ff8000-0xffff800013ffc000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800013ffc000-0xffff800013ffd000 4K PTE
0xffff800013ffd000-0xffff800013ffe000 4K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xffff800013ffe000-0xffff800014000000 8K PTE
0xffff800014000000-0xffff800014004000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800014004000-0xffff800014005000 4K PTE
0xffff800014005000-0xffff800014006000 4K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xffff800014006000-0xffff80001400d000 28K PTE
0xffff80001400d000-0xffff80001400e000 4K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xffff80001400e000-0xffff800014015000 28K PTE
0xffff800014015000-0xffff800014016000 4K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xffff800014016000-0xffff800014038000 136K PTE
0xffff800014038000-0xffff80001403c000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff80001403c000-0xffff800014040000 16K PTE
0xffff800014040000-0xffff800014044000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800014044000-0xffff800014048000 16K PTE
0xffff800014048000-0xffff80001404c000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff80001404c000-0xffff800014050000 16K PTE
0xffff800014050000-0xffff800014054000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800014054000-0xffff800014058000 16K PTE
0xffff800014058000-0xffff80001405c000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff80001405c000-0xffff800014060000 16K PTE
0xffff800014060000-0xffff800014064000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800014064000-0xffff800014065000 4K PTE
0xffff800014065000-0xffff8000140a7000 264K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff8000140a7000-0xffff8000140a8000 4K PTE
0xffff8000140a8000-0xffff8000140b3000 44K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff8000140b3000-0xffff8000140b8000 20K PTE
0xffff8000140b8000-0xffff8000140bc000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff8000140bc000-0xffff8000140c8000 48K PTE
0xffff8000140c8000-0xffff8000140cc000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff8000140cc000-0xffff8000140e8000 112K PTE
0xffff8000140e8000-0xffff8000140ec000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff8000140ec000-0xffff800014128000 240K PTE
0xffff800014128000-0xffff80001412c000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff80001412c000-0xffff800014130000 16K PTE
0xffff800014130000-0xffff800014134000 16K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800014134000-0xffff800014135000 4K PTE
0xffff800014135000-0xffff800014138000 12K PTE RW NX SHD AF UXN MEM/NORMAL
0xffff800014138000-0xffff800014200000 800K PTE
0xffff800014200000-0xffff800020000000 190M PMD
0xffff800020000000-0xffff800030000000 256M PTE RW NX SHD AF UXN DEVICE/nGnRnE
0xffff800030000000-0xffff800040000000 256M PMD
0xffff800040000000-0xffff808000000000 511G PUD
0xffff808000000000-0xfffffd8000000000 125T PGD
0xfffffd8000000000-0xfffffdff80000000 510G PUD
0xfffffdff80000000-0xfffffdffbfe00000 1022M PMD
0xfffffdffbfe00000-0xfffffdffbffd1000 1860K PTE
0xfffffdffbffd1000-0xfffffdffbffd4000 12K PTE RW NX SHD AF UXN MEM/NORMAL
0xfffffdffbffd4000-0xfffffdffbfff0000 112K PTE
---[ vmalloc() end ]---
0xfffffdffbfff0000-0xfffffdffc0000000 64K PTE
0xfffffdffc0000000-0xfffffdfffe400000 996M PMD
0xfffffdfffe400000-0xfffffdfffe5f9000 2020K PTE
---[ Fixmap start ]---
0xfffffdfffe5f9000-0xfffffdfffe5fa000 4K PTE
0xfffffdfffe5fa000-0xfffffdfffe5fb000 4K PTE ro x SHD AF UXN MEM/NORMAL
0xfffffdfffe5fb000-0xfffffdfffe5fc000 4K PTE ro NX SHD AF UXN MEM/NORMAL
0xfffffdfffe5fc000-0xfffffdfffe5ff000 12K PTE
0xfffffdfffe5ff000-0xfffffdfffe600000 4K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xfffffdfffe600000-0xfffffdfffe800000 2M PMD ro NX SHD AF BLK UXN MEM/NORMAL
0xfffffdfffe800000-0xfffffdfffea00000 2M PMD
---[ Fixmap end ]---
0xfffffdfffea00000-0xfffffdfffec00000 2M PMD
---[ PCI I/O start ]---
0xfffffdfffec00000-0xfffffdfffec10000 64K PTE RW NX SHD AF UXN DEVICE/nGnRE
0xfffffdfffec10000-0xfffffdfffee00000 1984K PTE
0xfffffdfffee00000-0xfffffdffffc00000 14M PMD
---[ PCI I/O end ]---
0xfffffdffffc00000-0xfffffdffffe00000 2M PMD
---[ vmemmap start ]---
0xfffffdffffe00000-0xfffffe0000e00000 16M PMD RW NX SHD AF BLK UXN MEM/NORMAL
0xfffffe0000e00000-0xfffffe0040000000 1010M PMD
0xfffffe0040000000-0xfffffe8000000000 511G PUD
0xfffffe8000000000-0x0000000000000000 1536G PGD
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dump 进程页表
linux系统上，通过对/proc//pagemap的操作可以dump进程的页表信息。
这个文件的介绍可以参考linux/Documentation/vm/pagemap.txt。直接cat
这个文件的无法得到信息，我们需要按照上面文件中描述的格式写代码解析。
内核代码在tools/vm/page-types.c提供了解析的工具。可以使用:
make -C tools/vm 编译得到page-types这个工具。使用的效果类似:
sudo ./page-types --pid 91228
flags page-count MB symbolic-flags long-symbolic-flags
0x0000000000000800 1 0 ___________M________________________________ mmap
0x000000000000086c 706 2 __RU_lA____M________________________________ referenced,uptodate,lru,active,mmap
0x0000000000005828 520 2 ___U_l_____Ma_b_____________________________ uptodate,lru,mmap,anonymous,swapbacked
0x000000000000586c 1 0 __RU_lA____Ma_b_____________________________ referenced,uptodate,lru,active,mmap,anonymous,swapbacked
total 1228 4