kvm_stat

#!/usr/bin/python

import curses
import sys, os, time

class Stats:
    def __init__(self):
        self.base = '/sys/kernel/debug/kvm'
        self.values = {}
        for key in os.listdir(self.base):
            self.values[key] = None
    def get(self):
        for key, oldval in self.values.iteritems():
            newval = int(file(self.base + '/' + key).read())
            newdelta = None
            if oldval is not None:
                newdelta = newval - oldval[0]
            self.values[key] = (newval, newdelta)
        return self.values

if not os.access('/sys/kernel/debug', os.F_OK):
    print 'Please enable CONFIG_DEBUGFS in your kernel'
    sys.exit(1)
if not os.access('/sys/kernel/debug/kvm', os.F_OK):
    print "Please mount debugfs ('mount -t debugfs debugfs /sys/kernel/debug')"
    print "and ensure the kvm modules are loaded"
    sys.exit(1)

stats = Stats()
        
def main(screen, stats):
    curses.use_default_colors()
    curses.noecho()
    def refresh():
        screen.erase()
        screen.addstr(0, 0, 'kvm statistics')
        row = 2
        s = stats.get()
        for key in sorted(s.keys()):
            values = s[key]
            screen.addstr(row, 1, key)
            screen.addstr(row, 12, '%10d' % (values[0],))
            if values[1] is not None:
                screen.addstr(row, 22, '%8d' % (values[1],))
            row += 1
        screen.refresh()

    while True:
        refresh()
        curses.halfdelay(10)
        try:
            c = screen.getkey()
            if c == 'q':
                break
        except KeyboardInterrupt:
            break
        except curses.error:
            continue
        

import curses.wrapper
curses.wrapper(main, stats)