Exercise 3: Swap information

On a live system, you can check the status of swap space through commands such as vmstat and, if you have a Solaris 2 system, the swap command. Unfortunately, neither command can be run against postmortem files.

Task:

On a Solaris 2 system, find the kernel structure that maintains swap space status and write an adb macro(s) that prints out some of this data.

Hints:

Each swap file will have its own swapinfo structure.

Each swapinfo instruction points to a vnode structure.

An example of output to aim for:

This example shows both the output of swap -l and our adb macro on a live system.

 #  swap -l  swapfile             dev  swaplo blocks   free  /dev/dsk/c0t3d0s1   32,25      8 197560 164264  /work/littleswap      -        8  32760  32592  #  #  adb -k -I /mymacros /dev/ksyms /dev/mem  physmem 1e03  $<swapinfo  zs_softintr_id+0xffc:           Swap file: /dev/dsk/c0t3d0s1  cn_dip+0x4ed0:  Type:   3                  Major:  32                   Minor:  25                  Blocks: 197560                  Free:   164264  0xfc52c540:     Swap file: /work/littleswap  0xfc3b1c2c:     Type:   1                  Major:  0                   Minor:  0                  Blocks: 32760                  Free:   32592  $q  # 

Try to match the output from swap -l instead of swap -s. swap -s reports on physical (anonymous) memory, as well as disk-resident swap space, and therefore involves a lot more work. If you do want to tackle anonymous memory, read the anon.h header file in /usr/include/vm .