crash —— 查看进程的vma结构体

crash提供了vm命令来输出进程的vma相关的信息。

输出当前当进程的vma列表

crash> vm
PID: 3319   TASK: ffff889760358000  CPU: 6   COMMAND: "kvm"MM               PGD          RSS    TOTAL_VM
ffff893ada165000  ffff893a8c4e2000  45772k  9535832kVMA           START       END     FLAGS FILE
ffff893a7eab1960 55b4b8274000 55b4b90d6000 8000875 /sf/bin/qemu-system-x86_64
ffff893a7eab1ed0 55b4b92d5000 55b4b9476000 8100875 /sf/bin/qemu-system-x86_64
ffff893cb6d533f0 55b4b9476000 55b4b956d000 8100877 /sf/bin/qemu-system-x86_64
ffff893a7eab1c18 55b4b956d000 55b4b9597000 8100077
ffff888bb1fbc828 7efa95dcf000 7efa95dd0000 8100070
ffff88ddadc64658 7efa95dd0000 7efa965d0000 8100077
ffff88d5d679bed0 7efa965d0000 7efa965d1000 8100070
...

查看指定进程的vma列表

crash> vm -p 2085
PID: 2085   TASK: ffff88dcca1fa000  CPU: 61  COMMAND: "supervisor"MM               PGD          RSS    TOTAL_VM
ffff88dea7232000  ffff88ddab4aa000  1960k    16960kVMA           START       END     FLAGS FILE
ffff88dcc9122658     400000     40e000 8000875 /sf/bin/supervisor
VIRTUAL     PHYSICAL
400000      5e6cdf6000
401000      5e57277000
...
40c000      5e6efca000
40d000      5e7ad44000VMA           START       END     FLAGS FILE
ffff88dcc9123308     60d000     60e000 8100871 /sf/bin/supervisor
VIRTUAL     PHYSICAL
60d000      5be9452000VMA           START       END     FLAGS FILE
ffff88dcc9123960     60e000     60f000 8100873 /sf/bin/supervisor
VIRTUAL     PHYSICAL
60e000      5c00fdd000VMA           START       END     FLAGS FILE
ffff88dcc91222b8    2381000    23a6000 8100073
VIRTUAL     PHYSICAL
2381000     5c181b3000
2382000     5bdd057000
2383000     5c30e4f000
...VMA           START       END     FLAGS FILE
ffff88dcc9123d00 7fa1cecdd000 7fa1cece0000 8000075 /lib/x86_64-linux-gnu/libdl-2.23.so
VIRTUAL     PHYSICAL
7fa1cecdd000  5e4ad82000
7fa1cecde000  5e6359c000
7fa1cecdf000  5e58939000VMA           START       END     FLAGS FILE
ffff88dcc91223a0 7fa1cece0000 7fa1ceedf000 8000070 /lib/x86_64-linux-gnu/libdl-2.23.so
VIRTUAL     PHYSICAL
7fa1cece0000  FILE: /lib/x86_64-linux-gnu/libdl-2.23.so  OFFSET: 3000
7fa1cece1000  FILE: /lib/x86_64-linux-gnu/libdl-2.23.so  OFFSET: 4000
7fa1cece2000  FILE: /lib/x86_64-linux-gnu/libdl-2.23.so  OFFSET: 5000
7fa1cece3000  FILE: /lib/x86_64-linux-gnu/libdl-2.23.so  OFFSET: 6000
...VMA           START       END     FLAGS FILE
ffff88dcc91236a8 7fa1cf0a1000 7fa1cf2a1000 8000070 /lib/x86_64-linux-gnu/libc-2.23.so
VIRTUAL     PHYSICAL
7fa1cf0a1000  FILE: /lib/x86_64-linux-gnu/libc-2.23.so  OFFSET: 1c0000
7fa1cf0a2000  FILE: /lib/x86_64-linux-gnu/libc-2.23.so  OFFSET: 1c1000
7fa1cf0a3000  FILE: /lib/x86_64-linux-gnu/libc-2.23.so  OFFSET: 1c2000
...
7fa1cf29f000  FILE: /lib/x86_64-linux-gnu/libc-2.23.so  OFFSET: 3be000
7fa1cf2a0000  FILE: /lib/x86_64-linux-gnu/libc-2.23.so  OFFSET: 3bf000VMA           START       END     FLAGS FILE
ffff88dcc9123790 7fa1cf2a1000 7fa1cf2a5000 8100071 /lib/x86_64-linux-gnu/libc-2.23.so
VIRTUAL     PHYSICAL
7fa1cf2a1000  5b9e194000
7fa1cf2a2000  5c77e48000
7fa1cf2a3000  5c14c49000
7fa1cf2a4000  5be52cf000VMA           START       END     FLAGS FILE
ffff88dcc9123a48 7fa1cf2a5000 7fa1cf2a7000 8100073 /lib/x86_64-linux-gnu/libc-2.23.so
VIRTUAL     PHYSICAL
7fa1cf2a5000  5c65e5e000
7fa1cf2a6000  5c22353000VMA           START       END     FLAGS FILE
ffff88dcc9122570 7fa1cf2a7000 7fa1cf2ab000 8100073
VIRTUAL     PHYSICAL
7fa1cf2a7000  5bbfd52000
7fa1cf2a8000  5c0957a000
7fa1cf2a9000  (not mapped)
7fa1cf2aa000  5c7a4ea000
...

查看指定进程的指定vma的的内容

下面查看进程2085的vma:ffff88dcc9122570的信息：

crash> vm  -P ffff88dcc9122570 2085
PID: 2085   TASK: ffff88dcca1fa000  CPU: 61  COMMAND: "supervisor"VMA           START       END     FLAGS FILE
ffff88dcc9122570 7fa1cf2a7000 7fa1cf2ab000 8100073
VIRTUAL     PHYSICAL
7fa1cf2a7000  5bbfd52000
7fa1cf2a8000  5c0957a000
7fa1cf2a9000  (not mapped)
7fa1cf2aa000  5c7a4ea000

或者使用2085进程的task_struct结构体的地址ffff88dcca1fa000：

crash> vm  -P ffff88dcc9122570 ffff88dcca1fa000
PID: 2085   TASK: ffff88dcca1fa000  CPU: 61  COMMAND: "supervisor"VMA           START       END     FLAGS FILE
ffff88dcc9122570 7fa1cf2a7000 7fa1cf2ab000 8100073
VIRTUAL     PHYSICAL
7fa1cf2a7000  5bbfd52000
7fa1cf2a8000  5c0957a000
7fa1cf2a9000  (not mapped)
7fa1cf2aa000  5c7a4ea000

查看某个进程的vma结构体的内容

crash> vm -x -v 2085
PID: 2085   TASK: ffff88dcca1fa000  CPU: 61  COMMAND: "supervisor"
struct vm_area_struct {vm_start = 0x400000,vm_end = 0x40e000,vm_next = 0xffff88dcc9123308,vm_prev = 0x0,vm_rb = {__rb_parent_color = 0xffff88dcc9123329,rb_right = 0x0,rb_left = 0x0},rb_subtree_gap = 0x400000,vm_mm = 0xffff88dea7232000,vm_page_prot = {pgprot = 0x25},vm_flags = 0x8000875,shared = {rb = {__rb_parent_color = 0xffff893cb8ff5f28,rb_right = 0x0,rb_left = 0x0},rb_subtree_last = 0xd},anon_vma_chain = {next = 0xffff88dcc91226d0,prev = 0xffff88dcc91226d0},anon_vma = 0x0,vm_ops = 0xffffffff81e36e00 <generic_file_vm_ops>,vm_pgoff = 0x0,vm_file = 0xffff88ddae938c00,
...
}
...
struct vm_area_struct {vm_start = 0x7ffe1cb03000,vm_end = 0x7ffe1cb05000,vm_next = 0x0,vm_prev = 0xffff88dcc831e9f8,vm_rb = {__rb_parent_color = 0xffff88dcc831ea18,rb_right = 0x0,rb_left = 0x0},rb_subtree_gap = 0x0,vm_mm = 0xffff88dea7232000,vm_page_prot = {pgprot = 0x25},vm_flags = 0x8040075,shared = {rb = {__rb_parent_color = 0x0,rb_right = 0x0,rb_left = 0x0},rb_subtree_last = 0x0},anon_vma_chain = {next = 0xffff88dcc831fd78,prev = 0xffff88dcc831fd78},anon_vma = 0x0,vm_ops = 0xffffffff81e3a100 <special_mapping_vmops>,vm_pgoff = 0x0,vm_file = 0x0,vm_private_data = 0xffffffff81e00f20 <vdso_mapping>,
...
}