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#!/usr/bin/python
import curses
import sys, os, time, optparse
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_DEBUG_FS 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()
label_width = 20
number_width = 10
def tui(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]
col = 1
screen.addstr(row, col, key)
col += label_width
screen.addstr(row, col, '%10d' % (values[0],))
col += number_width
if values[1] is not None:
screen.addstr(row, col, '%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
def batch(stats):
s = stats.get()
time.sleep(1)
s = stats.get()
for key in sorted(s.keys()):
values = s[key]
print '%-22s%10d%10d' % (key, values[0], values[1])
options = optparse.OptionParser()
options.add_option('-1', '--once', '--batch',
action = 'store_true',
default = False,
dest = 'once',
help = 'run in batch mode for one second',
)
(options, args) = options.parse_args(sys.argv)
if not options.once:
import curses.wrapper
curses.wrapper(tui, stats)
else:
batch(stats)
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