kvm/kvm_stat

   1 #!/usr/bin/python
   2
   3 import curses
   4 import sys, os, time
   5
   6 class Stats:
   7     def __init__(self):
   8         self.base = '/sys/kernel/debug/kvm'
   9         self.values = {}
  10         for key in os.listdir(self.base):
  11             self.values[key] = None
  12     def get(self):
  13         for key, oldval in self.values.iteritems():
  14             newval = int(file(self.base + '/' + key).read())
  15             newdelta = None
  16             if oldval is not None:
  17                 newdelta = newval - oldval[0]
  18             self.values[key] = (newval, newdelta)
  19         return self.values
  20
  21 if not os.access('/sys/kernel/debug', os.F_OK):
  22     print 'Please enable CONFIG_DEBUG_FS in your kernel'
  23     sys.exit(1)
  24 if not os.access('/sys/kernel/debug/kvm', os.F_OK):
  25     print "Please mount debugfs ('mount -t debugfs debugfs /sys/kernel/debug')"
  26     print "and ensure the kvm modules are loaded"
  27     sys.exit(1)
  28
  29 stats = Stats()
  30
  31 def main(screen, stats):
  32     curses.use_default_colors()
  33     curses.noecho()
  34     def refresh():
  35         screen.erase()
  36         screen.addstr(0, 0, 'kvm statistics')
  37         row = 2
  38         s = stats.get()
  39         for key in sorted(s.keys()):
  40             values = s[key]
  41             screen.addstr(row, 1, key)
  42             screen.addstr(row, 12, '%10d' % (values[0],))
  43             if values[1] is not None:
  44                 screen.addstr(row, 22, '%8d' % (values[1],))
  45             row += 1
  46         screen.refresh()
  47
  48     while True:
  49         refresh()
  50         curses.halfdelay(10)
  51         try:
  52             c = screen.getkey()
  53             if c == 'q':
  54                 break
  55         except KeyboardInterrupt:
  56             break
  57         except curses.error:
  58             continue
  59
  60
  61 import curses.wrapper
  62 curses.wrapper(main, stats)
  63