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qemu/scripts/kvm/kvm_stat
Janosch Frank 068294a1ca scripts/kvm/kvm_stat: Group arch specific data 
Using global variables and multiple initialization functions for arch
specific data makes the code hard to read. By grouping them in the
Arch classes we encapsulate and initialize them in one place.

Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Message-Id: <1452525484-32309-26-git-send-email-frankja@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-01-26 15:58:13 +01:00

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#!/usr/bin/python
#
# top-like utility for displaying kvm statistics
#
# Copyright 2006-2008 Qumranet Technologies
# Copyright 2008-2011 Red Hat, Inc.
#
# Authors:
# Avi Kivity <avi@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2. See
# the COPYING file in the top-level directory.
import curses
import sys
import os
import time
import optparse
import ctypes
import fcntl
import resource
import struct
import re
from collections import defaultdict
VMX_EXIT_REASONS = {
'EXCEPTION_NMI': 0,
'EXTERNAL_INTERRUPT': 1,
'TRIPLE_FAULT': 2,
'PENDING_INTERRUPT': 7,
'NMI_WINDOW': 8,
'TASK_SWITCH': 9,
'CPUID': 10,
'HLT': 12,
'INVLPG': 14,
'RDPMC': 15,
'RDTSC': 16,
'VMCALL': 18,
'VMCLEAR': 19,
'VMLAUNCH': 20,
'VMPTRLD': 21,
'VMPTRST': 22,
'VMREAD': 23,
'VMRESUME': 24,
'VMWRITE': 25,
'VMOFF': 26,
'VMON': 27,
'CR_ACCESS': 28,
'DR_ACCESS': 29,
'IO_INSTRUCTION': 30,
'MSR_READ': 31,
'MSR_WRITE': 32,
'INVALID_STATE': 33,
'MWAIT_INSTRUCTION': 36,
'MONITOR_INSTRUCTION': 39,
'PAUSE_INSTRUCTION': 40,
'MCE_DURING_VMENTRY': 41,
'TPR_BELOW_THRESHOLD': 43,
'APIC_ACCESS': 44,
'EPT_VIOLATION': 48,
'EPT_MISCONFIG': 49,
'WBINVD': 54,
'XSETBV': 55,
'APIC_WRITE': 56,
'INVPCID': 58,
}
SVM_EXIT_REASONS = {
'READ_CR0': 0x000,
'READ_CR3': 0x003,
'READ_CR4': 0x004,
'READ_CR8': 0x008,
'WRITE_CR0': 0x010,
'WRITE_CR3': 0x013,
'WRITE_CR4': 0x014,
'WRITE_CR8': 0x018,
'READ_DR0': 0x020,
'READ_DR1': 0x021,
'READ_DR2': 0x022,
'READ_DR3': 0x023,
'READ_DR4': 0x024,
'READ_DR5': 0x025,
'READ_DR6': 0x026,
'READ_DR7': 0x027,
'WRITE_DR0': 0x030,
'WRITE_DR1': 0x031,
'WRITE_DR2': 0x032,
'WRITE_DR3': 0x033,
'WRITE_DR4': 0x034,
'WRITE_DR5': 0x035,
'WRITE_DR6': 0x036,
'WRITE_DR7': 0x037,
'EXCP_BASE': 0x040,
'INTR': 0x060,
'NMI': 0x061,
'SMI': 0x062,
'INIT': 0x063,
'VINTR': 0x064,
'CR0_SEL_WRITE': 0x065,
'IDTR_READ': 0x066,
'GDTR_READ': 0x067,
'LDTR_READ': 0x068,
'TR_READ': 0x069,
'IDTR_WRITE': 0x06a,
'GDTR_WRITE': 0x06b,
'LDTR_WRITE': 0x06c,
'TR_WRITE': 0x06d,
'RDTSC': 0x06e,
'RDPMC': 0x06f,
'PUSHF': 0x070,
'POPF': 0x071,
'CPUID': 0x072,
'RSM': 0x073,
'IRET': 0x074,
'SWINT': 0x075,
'INVD': 0x076,
'PAUSE': 0x077,
'HLT': 0x078,
'INVLPG': 0x079,
'INVLPGA': 0x07a,
'IOIO': 0x07b,
'MSR': 0x07c,
'TASK_SWITCH': 0x07d,
'FERR_FREEZE': 0x07e,
'SHUTDOWN': 0x07f,
'VMRUN': 0x080,
'VMMCALL': 0x081,
'VMLOAD': 0x082,
'VMSAVE': 0x083,
'STGI': 0x084,
'CLGI': 0x085,
'SKINIT': 0x086,
'RDTSCP': 0x087,
'ICEBP': 0x088,
'WBINVD': 0x089,
'MONITOR': 0x08a,
'MWAIT': 0x08b,
'MWAIT_COND': 0x08c,
'XSETBV': 0x08d,
'NPF': 0x400,
}
# EC definition of HSR (from arch/arm64/include/asm/kvm_arm.h)
AARCH64_EXIT_REASONS = {
'UNKNOWN': 0x00,
'WFI': 0x01,
'CP15_32': 0x03,
'CP15_64': 0x04,
'CP14_MR': 0x05,
'CP14_LS': 0x06,
'FP_ASIMD': 0x07,
'CP10_ID': 0x08,
'CP14_64': 0x0C,
'ILL_ISS': 0x0E,
'SVC32': 0x11,
'HVC32': 0x12,
'SMC32': 0x13,
'SVC64': 0x15,
'HVC64': 0x16,
'SMC64': 0x17,
'SYS64': 0x18,
'IABT': 0x20,
'IABT_HYP': 0x21,
'PC_ALIGN': 0x22,
'DABT': 0x24,
'DABT_HYP': 0x25,
'SP_ALIGN': 0x26,
'FP_EXC32': 0x28,
'FP_EXC64': 0x2C,
'SERROR': 0x2F,
'BREAKPT': 0x30,
'BREAKPT_HYP': 0x31,
'SOFTSTP': 0x32,
'SOFTSTP_HYP': 0x33,
'WATCHPT': 0x34,
'WATCHPT_HYP': 0x35,
'BKPT32': 0x38,
'VECTOR32': 0x3A,
'BRK64': 0x3C,
}
# From include/uapi/linux/kvm.h, KVM_EXIT_xxx
USERSPACE_EXIT_REASONS = {
'UNKNOWN': 0,
'EXCEPTION': 1,
'IO': 2,
'HYPERCALL': 3,
'DEBUG': 4,
'HLT': 5,
'MMIO': 6,
'IRQ_WINDOW_OPEN': 7,
'SHUTDOWN': 8,
'FAIL_ENTRY': 9,
'INTR': 10,
'SET_TPR': 11,
'TPR_ACCESS': 12,
'S390_SIEIC': 13,
'S390_RESET': 14,
'DCR': 15,
'NMI': 16,
'INTERNAL_ERROR': 17,
'OSI': 18,
'PAPR_HCALL': 19,
'S390_UCONTROL': 20,
'WATCHDOG': 21,
'S390_TSCH': 22,
'EPR': 23,
'SYSTEM_EVENT': 24,
}
X86_EXIT_REASONS = {
'vmx': VMX_EXIT_REASONS,
'svm': SVM_EXIT_REASONS,
}
IOCTL_NUMBERS = {
'SET_FILTER': 0x40082406,
'ENABLE': 0x00002400,
'DISABLE': 0x00002401,
'RESET': 0x00002403,
}
class Arch(object):
"""Class that encapsulates global architecture specific data like
syscall and ioctl numbers.
"""
@staticmethod
def get_arch():
machine = os.uname()[4]
if machine.startswith('ppc'):
return ArchPPC()
elif machine.startswith('aarch64'):
return ArchA64()
elif machine.startswith('s390'):
return ArchS390()
else:
# X86_64
for line in open('/proc/cpuinfo'):
if not line.startswith('flags'):
continue
flags = line.split()
if 'vmx' in flags:
return ArchX86(VMX_EXIT_REASONS)
if 'svm' in flags:
return ArchX86(SVM_EXIT_REASONS)
return
class ArchX86(Arch):
def __init__(self, exit_reasons):
self.sc_perf_evt_open = 298
self.ioctl_numbers = IOCTL_NUMBERS
self.exit_reasons = exit_reasons
class ArchPPC(Arch):
def __init__(self):
self.sc_perf_evt_open = 319
self.ioctl_numbers = IOCTL_NUMBERS
self.ioctl_numbers['ENABLE'] = 0x20002400
self.ioctl_numbers['DISABLE'] = 0x20002401
# PPC comes in 32 and 64 bit and some generated ioctl
# numbers depend on the wordsize.
char_ptr_size = ctypes.sizeof(ctypes.c_char_p)
self.ioctl_numbers['SET_FILTER'] = 0x80002406 | char_ptr_size << 16
class ArchA64(Arch):
def __init__(self):
self.sc_perf_evt_open = 241
self.ioctl_numbers = IOCTL_NUMBERS
self.exit_reasons = AARCH64_EXIT_REASONS
class ArchS390(Arch):
def __init__(self):
self.sc_perf_evt_open = 331
self.ioctl_numbers = IOCTL_NUMBERS
self.exit_reasons = None
ARCH = Arch.get_arch()
def walkdir(path):
"""Returns os.walk() data for specified directory.
As it is only a wrapper it returns the same 3-tuple of (dirpath,
dirnames, filenames).
"""
return next(os.walk(path))
def parse_int_list(list_string):
"""Returns an int list from a string of comma separated integers and
integer ranges."""
integers = []
members = list_string.split(',')
for member in members:
if '-' not in member:
integers.append(int(member))
else:
int_range = member.split('-')
integers.extend(range(int(int_range[0]),
int(int_range[1]) + 1))
return integers
def get_online_cpus():
with open('/sys/devices/system/cpu/online') as cpu_list:
cpu_string = cpu_list.readline()
return parse_int_list(cpu_string)
def get_filters():
filters = {}
filters['kvm_userspace_exit'] = ('reason', USERSPACE_EXIT_REASONS)
if ARCH.exit_reasons:
filters['kvm_exit'] = ('exit_reason', ARCH.exit_reasons)
return filters
libc = ctypes.CDLL('libc.so.6', use_errno=True)
syscall = libc.syscall
class perf_event_attr(ctypes.Structure):
_fields_ = [('type', ctypes.c_uint32),
('size', ctypes.c_uint32),
('config', ctypes.c_uint64),
('sample_freq', ctypes.c_uint64),
('sample_type', ctypes.c_uint64),
('read_format', ctypes.c_uint64),
('flags', ctypes.c_uint64),
('wakeup_events', ctypes.c_uint32),
('bp_type', ctypes.c_uint32),
('bp_addr', ctypes.c_uint64),
('bp_len', ctypes.c_uint64),
]
def perf_event_open(attr, pid, cpu, group_fd, flags):
return syscall(ARCH.sc_perf_evt_open, ctypes.pointer(attr),
ctypes.c_int(pid), ctypes.c_int(cpu),
ctypes.c_int(group_fd), ctypes.c_long(flags))
PERF_TYPE_TRACEPOINT = 2
PERF_FORMAT_GROUP = 1 << 3
PATH_DEBUGFS_TRACING = '/sys/kernel/debug/tracing'
PATH_DEBUGFS_KVM = '/sys/kernel/debug/kvm'
class Group(object):
def __init__(self):
self.events = []
def add_event(self, event):
self.events.append(event)
def read(self):
length = 8 * (1 + len(self.events))
read_format = 'xxxxxxxx' + 'q' * len(self.events)
return dict(zip([event.name for event in self.events],
struct.unpack(read_format,
os.read(self.events[0].fd, length))))
class Event(object):
def __init__(self, name, group, trace_cpu, trace_point, trace_filter,
trace_set='kvm'):
self.name = name
self.fd = None
self.setup_event(group, trace_cpu, trace_point, trace_filter,
trace_set)
def setup_event_attribute(self, trace_set, trace_point):
id_path = os.path.join(PATH_DEBUGFS_TRACING, 'events', trace_set,
trace_point, 'id')
event_attr = perf_event_attr()
event_attr.type = PERF_TYPE_TRACEPOINT
event_attr.size = ctypes.sizeof(event_attr)
event_attr.config = int(open(id_path).read())
event_attr.sample_period = 1
event_attr.read_format = PERF_FORMAT_GROUP
return event_attr
def setup_event(self, group, trace_cpu, trace_point, trace_filter,
trace_set):
event_attr = self.setup_event_attribute(trace_set, trace_point)
group_leader = -1
if group.events:
group_leader = group.events[0].fd
fd = perf_event_open(event_attr, -1, trace_cpu,
group_leader, 0)
if fd == -1:
err = ctypes.get_errno()
raise OSError(err, os.strerror(err),
'while calling sys_perf_event_open().')
if trace_filter:
fcntl.ioctl(fd, ARCH.ioctl_numbers['SET_FILTER'],
trace_filter)
self.fd = fd
def enable(self):
fcntl.ioctl(self.fd, ARCH.ioctl_numbers['ENABLE'], 0)
def disable(self):
fcntl.ioctl(self.fd, ARCH.ioctl_numbers['DISABLE'], 0)
def reset(self):
fcntl.ioctl(self.fd, ARCH.ioctl_numbers['RESET'], 0)
class TracepointProvider(object):
def __init__(self):
self.group_leaders = []
self.filters = get_filters()
self._fields = self.get_available_fields()
self.setup_traces()
self.fields = self._fields
def get_available_fields(self):
path = os.path.join(PATH_DEBUGFS_TRACING, 'events', 'kvm')
fields = walkdir(path)[1]
extra = []
for field in fields:
if field in self.filters:
filter_name_, filter_dicts = self.filters[field]
for name in filter_dicts:
extra.append(field + '(' + name + ')')
fields += extra
return fields
def setup_traces(self):
cpus = get_online_cpus()
# The constant is needed as a buffer for python libs, std
# streams and other files that the script opens.
rlimit = len(cpus) * len(self._fields) + 50
try:
resource.setrlimit(resource.RLIMIT_NOFILE, (rlimit, rlimit))
except ValueError:
sys.exit("NOFILE rlimit could not be raised to {0}".format(rlimit))
for cpu in cpus:
group = Group()
for name in self._fields:
tracepoint = name
tracefilter = None
match = re.match(r'(.*)\((.*)\)', name)
if match:
tracepoint, sub = match.groups()
tracefilter = ('%s==%d\0' %
(self.filters[tracepoint][0],
self.filters[tracepoint][1][sub]))
group.add_event(Event(name=name,
group=group,
trace_cpu=cpu,
trace_point=tracepoint,
trace_filter=tracefilter))
self.group_leaders.append(group)
@property
def fields(self):
return self._fields
@fields.setter
def fields(self, fields):
self._fields = fields
for group in self.group_leaders:
for event in group.events:
if event.name in fields:
event.reset()
event.enable()
else:
event.disable()
def read(self):
ret = defaultdict(int)
for group in self.group_leaders:
for name, val in group.read().iteritems():
ret[name] += val
return ret
class DebugfsProvider(object):
def __init__(self):
self._fields = walkdir(PATH_DEBUGFS_KVM)[2]
@property
def fields(self):
return self._fields
@fields.setter
def fields(self, fields):
self._fields = fields
def read(self):
def val(key):
return int(file(PATH_DEBUGFS_KVM + '/' + key).read())
return dict([(key, val(key)) for key in self._fields])
class Stats(object):
def __init__(self, providers, fields=None):
self.providers = providers
self._fields_filter = fields
self.values = {}
self.update_provider_filters()
def update_provider_filters(self):
def wanted(key):
if not self._fields_filter:
return True
return re.match(self._fields_filter, key) is not None
# As we reset the counters when updating the fields we can
# also clear the cache of old values.
self.values = {}
for provider in self.providers:
provider_fields = [key for key in provider.fields if wanted(key)]
provider.fields = provider_fields
@property
def fields_filter(self):
return self._fields_filter
@fields_filter.setter
def fields_filter(self, fields_filter):
self._fields_filter = fields_filter
self.update_provider_filters()
def get(self):
for provider in self.providers:
new = provider.read()
for key in provider.fields:
oldval = self.values.get(key, (0, 0))
newval = new.get(key, 0)
newdelta = None
if oldval is not None:
newdelta = newval - oldval[0]
self.values[key] = (newval, newdelta)
return self.values
LABEL_WIDTH = 40
NUMBER_WIDTH = 10
def tui(screen, stats):
curses.use_default_colors()
curses.noecho()
drilldown = False
fields_filter = stats.fields_filter
def update_drilldown():
if not fields_filter:
if drilldown:
stats.fields_filter = None
else:
stats.fields_filter = r'^[^\(]*$'
update_drilldown()
def refresh(sleeptime):
screen.erase()
screen.addstr(0, 0, 'kvm statistics')
screen.addstr(2, 1, 'Event')
screen.addstr(2, 1 + LABEL_WIDTH + NUMBER_WIDTH - len('Total'), 'Total')
screen.addstr(2, 1 + LABEL_WIDTH + NUMBER_WIDTH + 8 - len('Current'), 'Current')
row = 3
s = stats.get()
def sortkey(x):
if s[x][1]:
return (-s[x][1], -s[x][0])
else:
return (0, -s[x][0])
for key in sorted(s.keys(), key=sortkey):
if row >= screen.getmaxyx()[0]:
break
values = s[key]
if not values[0] and not values[1]:
break
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] / sleeptime,))
row += 1
screen.refresh()
sleeptime = 0.25
while True:
refresh(sleeptime)
curses.halfdelay(int(sleeptime * 10))
sleeptime = 3
try:
c = screen.getkey()
if c == 'x':
drilldown = not drilldown
update_drilldown()
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])
def log(stats):
keys = sorted(stats.get().iterkeys())
def banner():
for k in keys:
print '%10s' % k[0:9],
print
def statline():
s = stats.get()
for k in keys:
print ' %9d' % s[k][1],
print
line = 0
banner_repeat = 20
while True:
time.sleep(1)
if line % banner_repeat == 0:
banner()
statline()
line += 1
def get_options():
optparser = optparse.OptionParser()
optparser.add_option('-1', '--once', '--batch',
action='store_true',
default=False,
dest='once',
help='run in batch mode for one second',
)
optparser.add_option('-l', '--log',
action='store_true',
default=False,
dest='log',
help='run in logging mode (like vmstat)',
)
optparser.add_option('-t', '--tracepoints',
action='store_true',
default=False,
dest='tracepoints',
help='retrieve statistics from tracepoints',
)
optparser.add_option('-d', '--debugfs',
action='store_true',
default=False,
dest='debugfs',
help='retrieve statistics from debugfs',
)
optparser.add_option('-f', '--fields',
action='store',
default=None,
dest='fields',
help='fields to display (regex)',
)
(options, _) = optparser.parse_args(sys.argv)
return options
def get_providers(options):
providers = []
if options.tracepoints:
providers.append(TracepointProvider())
if options.debugfs:
providers.append(DebugfsProvider())
if len(providers) == 0:
providers.append(TracepointProvider())
return providers
def check_access():
if not os.path.exists('/sys/kernel/debug'):
sys.stderr.write('Please enable CONFIG_DEBUG_FS in your kernel.')
sys.exit(1)
if not os.path.exists(PATH_DEBUGFS_KVM):
sys.stderr.write("Please make sure, that debugfs is mounted and "
"readable by the current user:\n"
"('mount -t debugfs debugfs /sys/kernel/debug')\n"
"Also ensure, that the kvm modules are loaded.\n")
sys.exit(1)
if not os.path.exists(PATH_DEBUGFS_TRACING):
sys.stderr.write("Please make {0} readable by the current user.\n"
.format(PATH_DEBUGFS_TRACING))
sys.exit(1)
def main():
check_access()
options = get_options()
providers = get_providers(options)
stats = Stats(providers, fields=options.fields)
if options.log:
log(stats)
elif not options.once:
curses.wrapper(tui, stats)
else:
batch(stats)
if __name__ == "__main__":
main()
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