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kvmalloc.py
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kvmalloc.py
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#!/usr/bin/env python
import getopt
import time
import errno
import os
import sys
import re
import atexit
import multiprocessing
import libvirt
from datetime import datetime
if sys.platform == 'win32':
print "Windows is not supported."
exit(0)
try:
import hashlib
md5_new = hashlib.md5
except ImportError:
import md5
md5_new = md5.new
class Daemon:
def __init__(self, pidfile, stdin='/dev/null', stdout='/dev/null', stderr='/dev/null'):
self.stdin = stdin
self.stdout = stdout
self.stderr = stderr
self.pidfile = pidfile
def daemonize(self):
try:
pid = os.fork()
if pid > 0:
# exit first parent
sys.exit(0)
except OSError, e:
sys.stderr.write("fork #1 failed: %d (%s)\n" % (e.errno, e.strerror))
sys.exit(1)
# decouple from parent environment
os.chdir("/")
os.setsid()
os.umask(0)
# do second fork
try:
pid = os.fork()
if pid > 0:
# exit from second parent
sys.exit(0)
except OSError, e:
sys.stderr.write("fork #2 failed: %d (%s)\n" % (e.errno, e.strerror))
sys.exit(1)
# redirect standard file descriptors
sys.stdout.flush()
sys.stderr.flush()
si = file(self.stdin, 'r')
so = file(self.stdout, 'a+')
se = file(self.stderr, 'a+', 0)
os.dup2(si.fileno(), sys.stdin.fileno())
os.dup2(so.fileno(), sys.stdout.fileno())
os.dup2(se.fileno(), sys.stderr.fileno())
# write pidfile
atexit.register(self.delpid)
pid = str(os.getpid())
file(self.pidfile, 'w+').write("%s\n" % pid)
def delpid(self):
os.remove(self.pidfile)
def start(self):
"""
Start the daemon
"""
# Check for a pidfile to see if the daemon already runs
try:
pf = file(self.pidfile, 'r')
pid = int(pf.read().strip())
pf.close()
except IOError:
pid = None
if pid:
message = "pidfile %s already exists. kvmalloc is already running.\n"
sys.stderr.write(message % self.pidfile)
sys.exit(1)
# Start the daemon
self.daemonize()
self.run()
def stop(self):
# Get the pid from the pidfile
try:
pf = file(self.pidfile, 'r')
pid = int(pf.read().strip())
pf.close()
except IOError:
pid = None
if not pid:
message = "pidfile %s does not exist. kvmalloc daemon is not running.\n"
sys.stderr.write(message % self.pidfile)
return # not an error in a restart
# Try killing the daemon process
try:
while 1:
os.kill(pid, 7)
time.sleep(0.1)
except OSError, err:
err = str(err)
if err.find("No such process") > 0:
if os.path.exists(self.pidfile):
os.remove(self.pidfile)
else:
print str(err)
sys.exit(1)
def restart(self):
self.stop()
self.start()
def run(self):
"""
Override this method with a Daemon subclass
"""
class Proc:
def __init__(self):
self.proc = '/proc'
def path(self, *args):
return os.path.join(self.proc, *(str(a) for a in args))
def open(self, *args):
try:
return open(self.path(*args))
except (IOError, OSError):
val = sys.exc_info()[1]
if val.errno == errno.ENOENT or val.errno == errno.EPERM: # kernel thread or process is gone
raise LookupError
raise
def parse_options():
try:
long_options = ['full-args', 'help', 'total', 'verbose', 'sparse']
opts, args = getopt.getopt(sys.argv[1:], "fhtvsd:p:n:c:w:l:", long_options)
except getopt.GetoptError:
sys.stderr.write(display_help())
sys.exit(3)
if len(args):
sys.stderr.write("Unknown arguments: %s\n" % args)
sys.exit(3)
daemon_cmd = None
logfile_location = None
split_args = False
pids_to_show = None
proc_names_to_show = None
cpus_to_show = None
watch = None
only_total = False
verbose = False
sparse = False
for o, a in opts:
if o in ('-d',):
daemon_cmd = a
if o in ('-l',):
logfile_location = a
if o in ('-f', '--full-args'):
split_args = True
if o in ('-t', '--total'):
only_total = True
if o in ('-v', '--verbose'):
verbose = True
if o in ('-s', '--sparse'):
sparse = True
if o in ('-h', '--help'):
sys.stdout.write(display_help())
sys.exit(0)
if o in ('-n',):
try:
proc_names_to_show = [str(x) for x in a.split(',')]
except:
sys.stderr.write(display_help())
sys.exit(3)
if o in ('-p',):
try:
pids_to_show = [int(x) for x in a.split(',')]
except:
sys.stderr.write(display_help())
sys.exit(3)
if o in ('-c',):
try:
cpus_to_show = [int(x) for x in a.split(',')]
except:
sys.stderr.write(display_help())
sys.exit(3)
if o in ('-w',):
try:
watch = int(a)
except:
sys.stderr.write(display_help())
sys.exit(3)
return daemon_cmd, logfile_location, split_args, pids_to_show, cpus_to_show, \
proc_names_to_show, watch, only_total, verbose, sparse
def display_help():
help_msg = 'Usage: kvmalloc [OPTION]...\n' \
'\n' \
' -h, -help Show this help\n' \
' -v --verbose Verbose output shows thread cpu allocation\n'\
' -n <process> Name of hypervisor process (default: qemu-kvm)\n' \
' -w <N> Check stats every N seconds\n' \
' -d (start|stop|restart) Start, stop, or restart kvmalloc as a daemon\n' \
' -l <logfile> Logfile path when running kvmalloc as a daemon (-d)\n\n'
return help_msg
def kernel_ver():
kv = proc.open('sys/kernel/osrelease').readline().split(".")[:3]
last = len(kv)
if last == 2:
kv.append('0')
last -= 1
while last > 0:
for char in "-_":
kv[last] = kv[last].split(char)[0]
try:
int(kv[last])
except:
kv[last] = 0
last -= 1
return int(kv[0]), int(kv[1]), int(kv[2]) # (major,minor,release)
def human(num, power="K", units=None):
if num == 0.0:
return ""
if units is None:
powers = ["K", "M", "G", "T"]
while num >= 1000: # 4 digits
num /= 1024.0
power = powers[powers.index(power) + 1]
return "%.1f %sB" % (num, power)
else:
return "%.f" % ((num * 1024) / units)
def get_cmd_name(pid, split_args):
cmdline = proc.open(pid, 'cmdline').read().split("\0")
if cmdline[-1] == '' and len(cmdline) > 1:
cmdline = cmdline[:-1]
path = proc.path(pid, 'exe')
try:
path = os.readlink(path)
path = path.split('\0')[0]
except OSError:
val = sys.exc_info()[1]
if val.errno == errno.ENOENT or val.errno == errno.EPERM: # either kernel thread or process is gone
raise LookupError
raise
if split_args:
return " ".join(cmdline)
if path.endswith(" (deleted)"):
path = path[:-10]
if os.path.exists(path):
path += " [updated]"
else:
# The path could be have pre-link stuff so try cmdline which might have the full path present.
if os.path.exists(cmdline[0]):
path = cmdline[0] + " [updated]"
else:
path += " [deleted]"
exe = os.path.basename(path)
cmd = proc.open(pid, 'status').readline()[6:-1]
if exe.startswith(cmd):
cmd = exe # show non truncated version
return cmd
def get_vm_info():
TOTAL_MEM = 0
TOTAL_CPUS = 0
conn = libvirt.open("qemu:///system")
for id in conn.listDomainsID():
dom = conn.lookupByID(id)
infos = dom.info()
TOTAL_MEM += infos[1]
TOTAL_CPUS += infos[3]
return TOTAL_MEM, TOTAL_CPUS
def get_meminfo():
total_mem = 0
available_mem = 0
for line in proc.open('/proc/meminfo').readlines():
if re.split(' ', line)[0] == "MemTotal:":
total_mem = re.split(' *', line)[1]
if re.split(' ', line)[0] == "MemAvailable:":
available_mem = re.split(' *', line)[1]
return total_mem, available_mem
def get_cpu_affinity(pids_to_show, proc_names_to_show, cpus_to_show, split_args, include_self=True, only_self=False):
tasks = {}
for procpid in os.listdir(proc.path('')):
if not procpid.isdigit():
continue
try:
proccmd = get_cmd_name(procpid, split_args)
except LookupError:
continue
for pid in os.listdir(proc.path(procpid, 'task')):
if not pid.isdigit():
continue
pid = int(pid)
if only_self and pid != our_pid:
continue
if pid == our_pid and not include_self:
continue
if pids_to_show is not None and pid not in pids_to_show:
continue
try:
if os.path.exists(proc.path(procpid, 'task', pid, 'stat')): # stat
for line in proc.open(procpid, 'task', pid, 'stat').readlines():
cpu = re.split('\(.*\)| ', line)[39]
if cpus_to_show is None or int(cpu) in cpus_to_show:
add = 1
cmd = get_cmd_name(pid, split_args)
if proc_names_to_show is not None:
add = 0
if cmd in proc_names_to_show or proccmd in proc_names_to_show:
add = 1
if add == 1:
tasks[pid] = (cpu, cmd, proccmd)
except LookupError:
# kernel threads don't have exe links or process is gone
continue
return tasks
def verify_environment():
if os.geteuid() != 0:
sys.stderr.write("Root permission is required.\n")
if __name__ == '__main__':
sys.stderr.close()
sys.exit(1)
try:
kv = kernel_ver()
except (IOError, OSError):
val = sys.exc_info()[1]
if val.errno == errno.ENOENT:
sys.stderr.write("Couldn't access " + proc.path('') + "\nOnly GNU/Linux is supported\n")
sys.exit(2)
else:
raise
def std_exceptions(exception_type, value, tb):
sys.excepthook = sys.__excepthook__
if issubclass(exception_type, KeyboardInterrupt):
pass
elif issubclass(exception_type, IOError) and value.errno == errno.EPIPE:
pass
else:
sys.__excepthook__(exception_type, value, tb)
def find_pids(process_names):
include_self = True
only_self = False
pids = []
for pid in os.listdir(proc.path('')):
if not pid.isdigit():
continue
pid = int(pid)
if only_self and pid != our_pid:
continue
if pid == our_pid and not include_self:
continue
if pids_to_show is not None and pid not in pids_to_show:
continue
try:
cmd = get_cmd_name(pid, False)
for name in process_names:
if name == cmd:
pids.append(pid)
except LookupError:
# kernel threads don't have exe links or process is gone
continue
return pids
class KVMAllocDaemon(Daemon):
def run(self):
while True:
kvmalloc_main(True)
def print_cpu_usage(tasks, last_tasks=None, sparse=False, daemonize=False, logfile=None, proc_names_to_show=None):
sorted_tasks = [x for x in tasks.iteritems()]
sorted_tasks.sort(key=lambda x: x[1][0]) # sort by cpu
if sparse and last_tasks is not None:
if last_tasks is not None: # if this isn't the first time the process has been seen
last_sorted_tasks = [x for x in last_tasks.iteritems()]
last_sorted_tasks.sort(key=lambda x: x[1][0]) # sort by cpu
new_tasks = set(sorted_tasks).difference(last_sorted_tasks)
for newtask in new_tasks:
if daemonize:
logfile.write(str(datetime.now()) + ": ")
logfile.write("%4s%s %9s %20s \t%s%s%s\n" % ("CPU-", newtask[1][0], newtask[0], newtask[1][1], "(", newtask[1][2], ")"))
logfile.flush()
else:
sys.stdout.write(str(datetime.now()) + ": ")
sys.stdout.write("%4s%s %9s %20s \t%s%s%s\n" % ("CPU-", newtask[1][0], newtask[0], newtask[1][1], "(", newtask[1][2], ")"))
else:
for task in sorted_tasks:
if daemonize:
if sparse:
logfile.write(str(datetime.now()) + ": ")
logfile.write("%4s%s %9s %20s \t%s%s%s\n" % ("CPU-", task[1][0], task[0], task[1][1], "(", task[1][2], ")"))
logfile.flush()
else:
if sparse:
sys.stdout.write(str(datetime.now()) + ": ")
sys.stdout.write("%4s%s %9s %20s \t%s%s%s\n" % ("CPU-", task[1][0], task[0], task[1][1], "(", task[1][2], ")"))
def kvmalloc_main(daemonize=False):
logfile = None
tasks = None
daemon_cmd, logfile_location, split_args, pids_to_show, cpus_to_show, proc_names_to_show, \
watch, only_total, verbose, sparse = parse_options()
if proc_names_to_show is None:
proc_names_to_show = ["qemu-kvm"]
ncpu = multiprocessing.cpu_count()
if daemonize:
if logfile_location is None:
logfile_location = "/var/log/kvmalloc.log"
logfile = open(logfile_location, 'w')
if watch is not None:
try:
while True:
if not sparse:
timestamp = datetime.now()
if daemonize:
logfile.write("\n**** " + str(timestamp) + " ****\n\n")
logfile.flush()
else:
print "\n****", timestamp, "****\n"
last_tasks = tasks
tasks = get_cpu_affinity(pids_to_show, proc_names_to_show, cpus_to_show, split_args)
if verbose:
print ""
print "Total %s threads: %s" % (proc_names_to_show[0], len(tasks))
print_cpu_usage(tasks, None, sparse, daemonize, logfile, proc_names_to_show)
total_memory, available_memory = get_meminfo()
total_vm_mem, total_vm_cpus = get_vm_info()
print ""
print "Total System Memory:", human(int(total_memory))
print "Allocated VM Memory: %s" % (human(total_vm_mem))
print "Available System Memory:", human(int(available_memory))
print ""
print "Physical CPUs: %s" % (ncpu)
print "Allocated VM CPUs: %s" % (total_vm_cpus)
print "VM CPU/Physical CPU ratio: %s" % (float(total_vm_cpus) / float(ncpu))
print ""
time.sleep(watch) # milliseconds
except KeyboardInterrupt:
pass
else:
tasks = get_cpu_affinity(pids_to_show, proc_names_to_show, cpus_to_show, split_args)
if verbose:
print ""
print "Total %s threads: %s" % (proc_names_to_show[0], len(tasks))
print_cpu_usage(tasks, None, sparse, daemonize, logfile, proc_names_to_show)
total_memory, available_memory = get_meminfo()
total_vm_mem, total_vm_cpus = get_vm_info()
print ""
print "Total System Memory:", human(int(total_memory))
print "Allocated VM Memory: %s" % (human(total_vm_mem))
print "Available System Memory:", human(int(available_memory))
print ""
print "Physical CPUs: %s" % (ncpu)
print "Allocated VM CPUs: %s" % (total_vm_cpus)
print "VM CPU/Physical CPU ratio: %s" % (float(total_vm_cpus) / float(ncpu))
print ""
sys.stdout.close()
if daemonize:
logfile.close()
# Globals
sys.excepthook = std_exceptions
our_pid = os.getpid()
proc = Proc()
if __name__ == '__main__':
daemon_cmd, logfile_location, split_args, pids_to_show, cpus_to_show, \
proc_names_to_show, watch, only_total, verbose, sparse = parse_options()
verify_environment()
daemon = KVMAllocDaemon('/var/run/kvmalloc.pid')
if daemon_cmd is not None:
if daemon_cmd == 'start':
print "kvmalloc daemon STARTED"
daemon.start()
elif daemon_cmd == 'stop':
print "kvmalloc daemon STOPPED"
daemon.stop()
elif daemon_cmd == 'restart':
print "kvmalloc daemon RESTARTED"
daemon.restart()
else:
kvmalloc_main()