mem.awk

#!/usr/bin/awk -f
BEGIN {
  while ( getline < "/proc/meminfo" > 0 )
    all_memory[$1]=$2
  for ( type in all_memory ) {
    if ( type == "MemFree:" ||
         type == "Buffers:" ||
         type == "Dirty:" ||
         type == "SwapCached:" ||
         type == "Writeback:" ||
         type == "WritebackTmp:" ||
         type == "Bounce:" ||
         type == "NFS_Unstable:" ||
         type == "HardwareCurrupted:" ||
         type == "PageTables:" )
      selected_memory[type]=all_memory[type]
    if ( type == "Cached:" )
      cached=all_memory[type]
    if ( type == "Shmem:" )
      shmem=all_memory[type]
    if ( type == "AnonHugePages:" )
      anonhugepages=all_memory[type]
    if ( type == "AnonPages:" )
      anonpages=all_memory[type]
    if ( type == "Mapped:" )
      mapped=all_memory[type]
    if ( type == "KernelStack:" || type == "Slab:" )
      kernel_memory+=all_memory[type]
    if ( type == "MemTotal:" )
      total_memory = all_memory[type]
    if ( type == "MemAvailable:" )
      memavailable = all_memory[type]
    if ( type == "Active:" )
      active = all_memory[type]
    if ( type == "Active(anon):" )
      activeanon = all_memory[type]
    if ( type == "Active(file):" )
      activefile = all_memory[type]
    if ( type == "Inactive:" )
      inactive = all_memory[type]
    if ( type == "Inactive(anon):" )
      inactiveanon = all_memory[type]
    if ( type == "Inactive(file):" )
      inactivefile = all_memory[type]
  }
  selected_memory["Cached:"]=cached-(shmem+mapped)
  selected_memory["AnonPages:"]=anonpages-anonhugepages
  selected_memory["kernel memory"]=kernel_memory
  for ( type in selected_memory )
    total+=selected_memory[type]
  for ( type in selected_memory )
    printf "%-20s %10d kB %7.2f %%\n", type, selected_memory[type], selected_memory[type]/total*100
  printf "--------------------------------------------\n"
  printf "%-20s %10d kB %7.2f %%\n", "total", total, total/total*100
  printf "%-20s %10d kB %7.2f %%\n", "MemTotal: ", total_memory, total_memory/total*100
  printf "--------------------------------------------\n"
  printf "%-20s %10d kB %7.2f %%\n", "MemAvailabe: ", memavailable, memavailable/total*100
  printf "--------------------------------------------\n"
  printf "%-20s %10d kB %7.2f %%\n", "Active: ", active, active/total*100
  printf " %-19s %10d kB %7.2f %%\n", "Anonymous: ", activeanon, activeanon/total*100
  printf " %-19s %10d kB %7.2f %%\n", "File: ", activefile, activefile/total*100
  printf "%-20s %10d kB %7.2f %%\n", "Inactive: ", inactive, inactive/total*100
  printf " %-19s %10d kB %7.2f %%\n", "Anonymous: ", inactiveanon, inactiveanon/total*100
  printf " %-19s %10d kB %7.2f %%\n", "File: ", inactivefile, inactivefile/total*100
}