/proc/vmallocinfo provides information about vmalloced/vmaped areas. One line per area, containing the virtual address range of the area, size in bytes, caller information of the creator, and optional information depending on the kind of area :

cat /proc/vmallocinfo
 
0xffffc20000000000-0xffffc20000201000 2101248 alloc_large_system_hash+0x204 ...
  /0x2c0 pages=512 vmalloc N0=128 N1=128 N2=128 N3=128
0xffffc20000201000-0xffffc20000302000 1052672 alloc_large_system_hash+0x204 ...
  /0x2c0 pages=256 vmalloc N0=64 N1=64 N2=64 N3=64
0xffffc20000302000-0xffffc20000304000    8192 acpi_tb_verify_table+0x21/0x4f...
  phys=7fee8000 ioremap
0xffffc20000304000-0xffffc20000307000   12288 acpi_tb_verify_table+0x21/0x4f...
  phys=7fee7000 ioremap
0xffffc2000031d000-0xffffc2000031f000    8192 init_vdso_vars+0x112/0x210
0xffffc2000031f000-0xffffc2000032b000   49152 cramfs_uncompress_init+0x2e ...
  /0x80 pages=11 vmalloc N0=3 N1=3 N2=2 N3=3
0xffffc2000033a000-0xffffc2000033d000   12288 sys_swapon+0x640/0xac0      ...
  pages=2 vmalloc N1=2
0xffffc20000347000-0xffffc2000034c000   20480 xt_alloc_table_info+0xfe ...
  /0x130 [x_tables] pages=4 vmalloc N0=4
0xffffffffa0000000-0xffffffffa000f000   61440 sys_init_module+0xc27/0x1d00 ...
   pages=14 vmalloc N2=14
0xffffffffa000f000-0xffffffffa0014000   20480 sys_init_module+0xc27/0x1d00 ...
   pages=4 vmalloc N1=4
0xffffffffa0014000-0xffffffffa0017000   12288 sys_init_module+0xc27/0x1d00 ...
   pages=2 vmalloc N1=2
0xffffffffa0017000-0xffffffffa0022000   45056 sys_init_module+0xc27/0x1d00 ...
   pages=10 vmalloc N0=10

where

• pages=nr Number of pages.
• phys=addr If a physical address was specified.
• ioremap I/O mapping (ioremap() and friends).
• vmalloc vmalloc() area.
• vmap vmap()ed pages.
• user VM_USERMAP area.
• vpages Buffer for pages pointers was vmalloced (huge area).
• N<node>=nr (Only on NUMA kernels) Number of pages allocated on memory node <node>.