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linux/tools/kvm/kvm_stat/kvm_stat
Stefan Raspl 5c1954d25d tools/kvm_stat: add new interactive command 'b' 
Toggle display total number of events by guest (debugfs only).
When switching to display of events by guest, field filters remain
active. I.e. the number of events per guest reported considers only
events matching the filters. Likewise with pid/guest filtering.
Note that when switching to display of events by guest, DebugfsProvider
remains to collect data for events as it did before, but the read()
method summarizes the values by pid.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-06-27 16:44:50 +02:00

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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.
"""The kvm_stat module outputs statistics about running KVM VMs
Three different ways of output formatting are available:
- as a top-like text ui
- in a key -> value format
- in an all keys, all values format
The data is sampled from the KVM's debugfs entries and its perf events.
"""
import curses
import sys
import os
import time
import optparse
import ctypes
import fcntl
import resource
import struct
import re
import subprocess
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,
}
IOCTL_NUMBERS = {
'SET_FILTER': 0x40082406,
'ENABLE': 0x00002400,
'DISABLE': 0x00002401,
'RESET': 0x00002403,
}
class Arch(object):
"""Encapsulates global architecture specific data.
Contains the performance event open syscall and ioctl numbers, as
well as the VM exit reasons for the architecture it runs on.
"""
@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
self.ioctl_numbers['RESET'] = 0x20002403
# 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
self.exit_reasons = {}
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()
class perf_event_attr(ctypes.Structure):
"""Struct that holds the necessary data to set up a trace event.
For an extensive explanation see perf_event_open(2) and
include/uapi/linux/perf_event.h, struct perf_event_attr
All fields that are not initialized in the constructor are 0.
"""
_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 __init__(self):
super(self.__class__, self).__init__()
self.type = PERF_TYPE_TRACEPOINT
self.size = ctypes.sizeof(self)
self.read_format = PERF_FORMAT_GROUP
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):
"""Represents a perf event group."""
def __init__(self):
self.events = []
def add_event(self, event):
self.events.append(event)
def read(self):
"""Returns a dict with 'event name: value' for all events in the
group.
Values are read by reading from the file descriptor of the
event that is the group leader. See perf_event_open(2) for
details.
Read format for the used event configuration is:
struct read_format {
u64 nr; /* The number of events */
struct {
u64 value; /* The value of the event */
} values[nr];
};
"""
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):
"""Represents a performance event and manages its life cycle."""
def __init__(self, name, group, trace_cpu, trace_pid, trace_point,
trace_filter, trace_set='kvm'):
self.libc = ctypes.CDLL('libc.so.6', use_errno=True)
self.syscall = self.libc.syscall
self.name = name
self.fd = None
self.setup_event(group, trace_cpu, trace_pid, trace_point,
trace_filter, trace_set)
def __del__(self):
"""Closes the event's file descriptor.
As no python file object was created for the file descriptor,
python will not reference count the descriptor and will not
close it itself automatically, so we do it.
"""
if self.fd:
os.close(self.fd)
def perf_event_open(self, attr, pid, cpu, group_fd, flags):
"""Wrapper for the sys_perf_evt_open() syscall.
Used to set up performance events, returns a file descriptor or -1
on error.
Attributes are:
- syscall number
- struct perf_event_attr *
- pid or -1 to monitor all pids
- cpu number or -1 to monitor all cpus
- The file descriptor of the group leader or -1 to create a group.
- flags
"""
return self.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))
def setup_event_attribute(self, trace_set, trace_point):
"""Returns an initialized ctype perf_event_attr struct."""
id_path = os.path.join(PATH_DEBUGFS_TRACING, 'events', trace_set,
trace_point, 'id')
event_attr = perf_event_attr()
event_attr.config = int(open(id_path).read())
return event_attr
def setup_event(self, group, trace_cpu, trace_pid, trace_point,
trace_filter, trace_set):
"""Sets up the perf event in Linux.
Issues the syscall to register the event in the kernel and
then sets the optional filter.
"""
event_attr = self.setup_event_attribute(trace_set, trace_point)
# First event will be group leader.
group_leader = -1
# All others have to pass the leader's descriptor instead.
if group.events:
group_leader = group.events[0].fd
fd = self.perf_event_open(event_attr, trace_pid,
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):
"""Enables the trace event in the kernel.
Enabling the group leader makes reading counters from it and the
events under it possible.
"""
fcntl.ioctl(self.fd, ARCH.ioctl_numbers['ENABLE'], 0)
def disable(self):
"""Disables the trace event in the kernel.
Disabling the group leader makes reading all counters under it
impossible.
"""
fcntl.ioctl(self.fd, ARCH.ioctl_numbers['DISABLE'], 0)
def reset(self):
"""Resets the count of the trace event in the kernel."""
fcntl.ioctl(self.fd, ARCH.ioctl_numbers['RESET'], 0)
class Provider(object):
"""Encapsulates functionalities used by all providers."""
@staticmethod
def is_field_wanted(fields_filter, field):
"""Indicate whether field is valid according to fields_filter."""
if not fields_filter:
return True
return re.match(fields_filter, field) is not None
@staticmethod
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))
class TracepointProvider(Provider):
"""Data provider for the stats class.
Manages the events/groups from which it acquires its data.
"""
def __init__(self, pid, fields_filter):
self.group_leaders = []
self.filters = self.get_filters()
self.update_fields(fields_filter)
self.pid = pid
@staticmethod
def get_filters():
"""Returns a dict of trace events, their filter ids and
the values that can be filtered.
Trace events can be filtered for special values by setting a
filter string via an ioctl. The string normally has the format
identifier==value. For each filter a new event will be created, to
be able to distinguish the events.
"""
filters = {}
filters['kvm_userspace_exit'] = ('reason', USERSPACE_EXIT_REASONS)
if ARCH.exit_reasons:
filters['kvm_exit'] = ('exit_reason', ARCH.exit_reasons)
return filters
def get_available_fields(self):
"""Returns a list of available event's of format 'event name(filter
name)'.
All available events have directories under
/sys/kernel/debug/tracing/events/ which export information
about the specific event. Therefore, listing the dirs gives us
a list of all available events.
Some events like the vm exit reasons can be filtered for
specific values. To take account for that, the routine below
creates special fields with the following format:
event name(filter name)
"""
path = os.path.join(PATH_DEBUGFS_TRACING, 'events', 'kvm')
fields = self.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 update_fields(self, fields_filter):
"""Refresh fields, applying fields_filter"""
self._fields = [field for field in self.get_available_fields()
if self.is_field_wanted(fields_filter, field)]
@staticmethod
def get_online_cpus():
"""Returns a list of cpu id integers."""
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
with open('/sys/devices/system/cpu/online') as cpu_list:
cpu_string = cpu_list.readline()
return parse_int_list(cpu_string)
def setup_traces(self):
"""Creates all event and group objects needed to be able to retrieve
data."""
fields = self.get_available_fields()
if self._pid > 0:
# Fetch list of all threads of the monitored pid, as qemu
# starts a thread for each vcpu.
path = os.path.join('/proc', str(self._pid), 'task')
groupids = self.walkdir(path)[1]
else:
groupids = self.get_online_cpus()
# The constant is needed as a buffer for python libs, std
# streams and other files that the script opens.
newlim = len(groupids) * len(fields) + 50
try:
softlim_, hardlim = resource.getrlimit(resource.RLIMIT_NOFILE)
if hardlim < newlim:
# Now we need CAP_SYS_RESOURCE, to increase the hard limit.
resource.setrlimit(resource.RLIMIT_NOFILE, (newlim, newlim))
else:
# Raising the soft limit is sufficient.
resource.setrlimit(resource.RLIMIT_NOFILE, (newlim, hardlim))
except ValueError:
sys.exit("NOFILE rlimit could not be raised to {0}".format(newlim))
for groupid in groupids:
group = Group()
for name in 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]))
# From perf_event_open(2):
# pid > 0 and cpu == -1
# This measures the specified process/thread on any CPU.
#
# pid == -1 and cpu >= 0
# This measures all processes/threads on the specified CPU.
trace_cpu = groupid if self._pid == 0 else -1
trace_pid = int(groupid) if self._pid != 0 else -1
group.add_event(Event(name=name,
group=group,
trace_cpu=trace_cpu,
trace_pid=trace_pid,
trace_point=tracepoint,
trace_filter=tracefilter))
self.group_leaders.append(group)
@property
def fields(self):
return self._fields
@fields.setter
def fields(self, fields):
"""Enables/disables the (un)wanted events"""
self._fields = fields
for group in self.group_leaders:
for index, event in enumerate(group.events):
if event.name in fields:
event.reset()
event.enable()
else:
# Do not disable the group leader.
# It would disable all of its events.
if index != 0:
event.disable()
@property
def pid(self):
return self._pid
@pid.setter
def pid(self, pid):
"""Changes the monitored pid by setting new traces."""
self._pid = pid
# The garbage collector will get rid of all Event/Group
# objects and open files after removing the references.
self.group_leaders = []
self.setup_traces()
self.fields = self._fields
def read(self, by_guest=0):
"""Returns 'event name: current value' for all enabled events."""
ret = defaultdict(int)
for group in self.group_leaders:
for name, val in group.read().iteritems():
if name in self._fields:
ret[name] += val
return ret
def reset(self):
"""Reset all field counters"""
for group in self.group_leaders:
for event in group.events:
event.reset()
class DebugfsProvider(Provider):
"""Provides data from the files that KVM creates in the kvm debugfs
folder."""
def __init__(self, pid, fields_filter, include_past):
self.update_fields(fields_filter)
self._baseline = {}
self.do_read = True
self.paths = []
self.pid = pid
if include_past:
self.restore()
def get_available_fields(self):
""""Returns a list of available fields.
The fields are all available KVM debugfs files
"""
return self.walkdir(PATH_DEBUGFS_KVM)[2]
def update_fields(self, fields_filter):
"""Refresh fields, applying fields_filter"""
self._fields = [field for field in self.get_available_fields()
if self.is_field_wanted(fields_filter, field)]
@property
def fields(self):
return self._fields
@fields.setter
def fields(self, fields):
self._fields = fields
self.reset()
@property
def pid(self):
return self._pid
@pid.setter
def pid(self, pid):
self._pid = pid
if pid != 0:
vms = self.walkdir(PATH_DEBUGFS_KVM)[1]
if len(vms) == 0:
self.do_read = False
self.paths = filter(lambda x: "{}-".format(pid) in x, vms)
else:
self.paths = []
self.do_read = True
self.reset()
def read(self, reset=0, by_guest=0):
"""Returns a dict with format:'file name / field -> current value'.
Parameter 'reset':
0 plain read
1 reset field counts to 0
2 restore the original field counts
"""
results = {}
# If no debugfs filtering support is available, then don't read.
if not self.do_read:
return results
paths = self.paths
if self._pid == 0:
paths = []
for entry in os.walk(PATH_DEBUGFS_KVM):
for dir in entry[1]:
paths.append(dir)
for path in paths:
for field in self._fields:
value = self.read_field(field, path)
key = path + field
if reset == 1:
self._baseline[key] = value
if reset == 2:
self._baseline[key] = 0
if self._baseline.get(key, -1) == -1:
self._baseline[key] = value
increment = (results.get(field, 0) + value -
self._baseline.get(key, 0))
if by_guest:
pid = key.split('-')[0]
if pid in results:
results[pid] += increment
else:
results[pid] = increment
else:
results[field] = increment
return results
def read_field(self, field, path):
"""Returns the value of a single field from a specific VM."""
try:
return int(open(os.path.join(PATH_DEBUGFS_KVM,
path,
field))
.read())
except IOError:
return 0
def reset(self):
"""Reset field counters"""
self._baseline = {}
self.read(1)
def restore(self):
"""Reset field counters"""
self._baseline = {}
self.read(2)
class Stats(object):
"""Manages the data providers and the data they provide.
It is used to set filters on the provider's data and collect all
provider data.
"""
def __init__(self, options):
self.providers = self.get_providers(options)
self._pid_filter = options.pid
self._fields_filter = options.fields
self.values = {}
@staticmethod
def get_providers(options):
"""Returns a list of data providers depending on the passed options."""
providers = []
if options.debugfs:
providers.append(DebugfsProvider(options.pid, options.fields,
options.dbgfs_include_past))
if options.tracepoints or not providers:
providers.append(TracepointProvider(options.pid, options.fields))
return providers
def update_provider_filters(self):
"""Propagates fields filters to providers."""
# 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.update_fields(self._fields_filter)
def reset(self):
self.values = {}
for provider in self.providers:
provider.reset()
@property
def fields_filter(self):
return self._fields_filter
@fields_filter.setter
def fields_filter(self, fields_filter):
if fields_filter != self._fields_filter:
self._fields_filter = fields_filter
self.update_provider_filters()
@property
def pid_filter(self):
return self._pid_filter
@pid_filter.setter
def pid_filter(self, pid):
if pid != self._pid_filter:
self._pid_filter = pid
self.values = {}
for provider in self.providers:
provider.pid = self._pid_filter
def get(self, by_guest=0):
"""Returns a dict with field -> (value, delta to last value) of all
provider data."""
for provider in self.providers:
new = provider.read(by_guest=by_guest)
for key in new if by_guest else provider.fields:
oldval = self.values.get(key, (0, 0))[0]
newval = new.get(key, 0)
newdelta = newval - oldval
self.values[key] = (newval, newdelta)
return self.values
def toggle_display_guests(self, to_pid):
"""Toggle between collection of stats by individual event and by
guest pid
Events reported by DebugfsProvider change when switching to/from
reading by guest values. Hence we have to remove the excess event
names from self.values.
"""
if any(isinstance(ins, TracepointProvider) for ins in self.providers):
return 1
if to_pid:
for provider in self.providers:
if isinstance(provider, DebugfsProvider):
for key in provider.fields:
if key in self.values.keys():
del self.values[key]
else:
oldvals = self.values.copy()
for key in oldvals:
if key.isdigit():
del self.values[key]
# Update oldval (see get())
self.get(to_pid)
return 0
DELAY_DEFAULT = 3.0
MAX_GUEST_NAME_LEN = 48
MAX_REGEX_LEN = 44
DEFAULT_REGEX = r'^[^\(]*$'
SORT_DEFAULT = 0
class Tui(object):
"""Instruments curses to draw a nice text ui."""
def __init__(self, stats):
self.stats = stats
self.screen = None
self._delay_initial = 0.25
self._delay_regular = DELAY_DEFAULT
self._sorting = SORT_DEFAULT
self._display_guests = 0
def __enter__(self):
"""Initialises curses for later use. Based on curses.wrapper
implementation from the Python standard library."""
self.screen = curses.initscr()
curses.noecho()
curses.cbreak()
# The try/catch works around a minor bit of
# over-conscientiousness in the curses module, the error
# return from C start_color() is ignorable.
try:
curses.start_color()
except curses.error:
pass
# Hide cursor in extra statement as some monochrome terminals
# might support hiding but not colors.
try:
curses.curs_set(0)
except curses.error:
pass
curses.use_default_colors()
return self
def __exit__(self, *exception):
"""Resets the terminal to its normal state. Based on curses.wrapper
implementation from the Python standard library."""
if self.screen:
self.screen.keypad(0)
curses.echo()
curses.nocbreak()
curses.endwin()
def get_all_gnames(self):
"""Returns a list of (pid, gname) tuples of all running guests"""
res = []
try:
child = subprocess.Popen(['ps', '-A', '--format', 'pid,args'],
stdout=subprocess.PIPE)
except:
raise Exception
for line in child.stdout:
line = line.lstrip().split(' ', 1)
# perform a sanity check before calling the more expensive
# function to possibly extract the guest name
if ' -name ' in line[1]:
res.append((line[0], self.get_gname_from_pid(line[0])))
child.stdout.close()
return res
def print_all_gnames(self, row):
"""Print a list of all running guests along with their pids."""
self.screen.addstr(row, 2, '%8s %-60s' %
('Pid', 'Guest Name (fuzzy list, might be '
'inaccurate!)'),
curses.A_UNDERLINE)
row += 1
try:
for line in self.get_all_gnames():
self.screen.addstr(row, 2, '%8s %-60s' % (line[0], line[1]))
row += 1
if row >= self.screen.getmaxyx()[0]:
break
except Exception:
self.screen.addstr(row + 1, 2, 'Not available')
def get_pid_from_gname(self, gname):
"""Fuzzy function to convert guest name to QEMU process pid.
Returns a list of potential pids, can be empty if no match found.
Throws an exception on processing errors.
"""
pids = []
for line in self.get_all_gnames():
if gname == line[1]:
pids.append(int(line[0]))
return pids
@staticmethod
def get_gname_from_pid(pid):
"""Returns the guest name for a QEMU process pid.
Extracts the guest name from the QEMU comma line by processing the
'-name' option. Will also handle names specified out of sequence.
"""
name = ''
try:
line = open('/proc/{}/cmdline'
.format(pid), 'rb').read().split('\0')
parms = line[line.index('-name') + 1].split(',')
while '' in parms:
# commas are escaped (i.e. ',,'), hence e.g. 'foo,bar' results
# in # ['foo', '', 'bar'], which we revert here
idx = parms.index('')
parms[idx - 1] += ',' + parms[idx + 1]
del parms[idx:idx+2]
# the '-name' switch allows for two ways to specify the guest name,
# where the plain name overrides the name specified via 'guest='
for arg in parms:
if '=' not in arg:
name = arg
break
if arg[:6] == 'guest=':
name = arg[6:]
except (ValueError, IOError, IndexError):
pass
return name
def update_drilldown(self):
"""Sets or removes a filter that only allows fields without braces."""
if not self.stats.fields_filter:
self.stats.fields_filter = DEFAULT_REGEX
elif self.stats.fields_filter == DEFAULT_REGEX:
self.stats.fields_filter = None
def update_pid(self, pid):
"""Propagates pid selection to stats object."""
self.stats.pid_filter = pid
def refresh_header(self, pid=None):
"""Refreshes the header."""
if pid is None:
pid = self.stats.pid_filter
self.screen.erase()
gname = self.get_gname_from_pid(pid)
if gname:
gname = ('({})'.format(gname[:MAX_GUEST_NAME_LEN] + '...'
if len(gname) > MAX_GUEST_NAME_LEN
else gname))
if pid > 0:
self.screen.addstr(0, 0, 'kvm statistics - pid {0} {1}'
.format(pid, gname), curses.A_BOLD)
else:
self.screen.addstr(0, 0, 'kvm statistics - summary', curses.A_BOLD)
if self.stats.fields_filter and self.stats.fields_filter \
!= DEFAULT_REGEX:
regex = self.stats.fields_filter
if len(regex) > MAX_REGEX_LEN:
regex = regex[:MAX_REGEX_LEN] + '...'
self.screen.addstr(1, 17, 'regex filter: {0}'.format(regex))
if self._display_guests:
col_name = 'Guest Name'
else:
col_name = 'Event'
self.screen.addstr(2, 1, '%-40s %10s%7s %8s' %
(col_name, 'Total', '%Total', 'CurAvg/s'),
curses.A_STANDOUT)
self.screen.addstr(4, 1, 'Collecting data...')
self.screen.refresh()
def refresh_body(self, sleeptime):
row = 3
self.screen.move(row, 0)
self.screen.clrtobot()
stats = self.stats.get(self._display_guests)
def sortCurAvg(x):
# sort by current events if available
if stats[x][1]:
return (-stats[x][1], -stats[x][0])
else:
return (0, -stats[x][0])
def sortTotal(x):
# sort by totals
return (0, -stats[x][0])
total = 0.
for val in stats.values():
total += val[0]
if self._sorting == SORT_DEFAULT:
sortkey = sortCurAvg
else:
sortkey = sortTotal
for key in sorted(stats.keys(), key=sortkey):
if row >= self.screen.getmaxyx()[0]:
break
values = stats[key]
if not values[0] and not values[1]:
break
if values[0] is not None:
cur = int(round(values[1] / sleeptime)) if values[1] else ''
if self._display_guests:
key = self.get_gname_from_pid(key)
self.screen.addstr(row, 1, '%-40s %10d%7.1f %8s' %
(key, values[0], values[0] * 100 / total,
cur))
row += 1
if row == 3:
self.screen.addstr(4, 1, 'No matching events reported yet')
self.screen.refresh()
def show_msg(self, text):
"""Display message centered text and exit on key press"""
hint = 'Press any key to continue'
curses.cbreak()
self.screen.erase()
(x, term_width) = self.screen.getmaxyx()
row = 2
for line in text:
start = (term_width - len(line)) / 2
self.screen.addstr(row, start, line)
row += 1
self.screen.addstr(row + 1, (term_width - len(hint)) / 2, hint,
curses.A_STANDOUT)
self.screen.getkey()
def show_help_interactive(self):
"""Display help with list of interactive commands"""
msg = (' b toggle events by guests (debugfs only, honors'
' filters)',
' c clear filter',
' f filter by regular expression',
' g filter by guest name',
' h display interactive commands reference',
' o toggle sorting order (Total vs CurAvg/s)',
' p filter by PID',
' q quit',
' r reset stats',
' s set update interval',
' x toggle reporting of stats for individual child trace'
' events',
'Any other key refreshes statistics immediately')
curses.cbreak()
self.screen.erase()
self.screen.addstr(0, 0, "Interactive commands reference",
curses.A_BOLD)
self.screen.addstr(2, 0, "Press any key to exit", curses.A_STANDOUT)
row = 4
for line in msg:
self.screen.addstr(row, 0, line)
row += 1
self.screen.getkey()
self.refresh_header()
def show_filter_selection(self):
"""Draws filter selection mask.
Asks for a valid regex and sets the fields filter accordingly.
"""
while True:
self.screen.erase()
self.screen.addstr(0, 0,
"Show statistics for events matching a regex.",
curses.A_BOLD)
self.screen.addstr(2, 0,
"Current regex: {0}"
.format(self.stats.fields_filter))
self.screen.addstr(3, 0, "New regex: ")
curses.echo()
regex = self.screen.getstr()
curses.noecho()
if len(regex) == 0:
self.stats.fields_filter = DEFAULT_REGEX
self.refresh_header()
return
try:
re.compile(regex)
self.stats.fields_filter = regex
self.refresh_header()
return
except re.error:
continue
def show_vm_selection_by_pid(self):
"""Draws PID selection mask.
Asks for a pid until a valid pid or 0 has been entered.
"""
msg = ''
while True:
self.screen.erase()
self.screen.addstr(0, 0,
'Show statistics for specific pid.',
curses.A_BOLD)
self.screen.addstr(1, 0,
'This might limit the shown data to the trace '
'statistics.')
self.screen.addstr(5, 0, msg)
self.print_all_gnames(7)
curses.echo()
self.screen.addstr(3, 0, "Pid [0 or pid]: ")
pid = self.screen.getstr()
curses.noecho()
try:
if len(pid) > 0:
pid = int(pid)
if pid != 0 and not os.path.isdir(os.path.join('/proc/',
str(pid))):
msg = '"' + str(pid) + '": Not a running process'
continue
else:
pid = 0
self.refresh_header(pid)
self.update_pid(pid)
break
except ValueError:
msg = '"' + str(pid) + '": Not a valid pid'
def show_set_update_interval(self):
"""Draws update interval selection mask."""
msg = ''
while True:
self.screen.erase()
self.screen.addstr(0, 0, 'Set update interval (defaults to %fs).' %
DELAY_DEFAULT, curses.A_BOLD)
self.screen.addstr(4, 0, msg)
self.screen.addstr(2, 0, 'Change delay from %.1fs to ' %
self._delay_regular)
curses.echo()
val = self.screen.getstr()
curses.noecho()
try:
if len(val) > 0:
delay = float(val)
if delay < 0.1:
msg = '"' + str(val) + '": Value must be >=0.1'
continue
if delay > 25.5:
msg = '"' + str(val) + '": Value must be <=25.5'
continue
else:
delay = DELAY_DEFAULT
self._delay_regular = delay
break
except ValueError:
msg = '"' + str(val) + '": Invalid value'
self.refresh_header()
def show_vm_selection_by_guest_name(self):
"""Draws guest selection mask.
Asks for a guest name until a valid guest name or '' is entered.
"""
msg = ''
while True:
self.screen.erase()
self.screen.addstr(0, 0,
'Show statistics for specific guest.',
curses.A_BOLD)
self.screen.addstr(1, 0,
'This might limit the shown data to the trace '
'statistics.')
self.screen.addstr(5, 0, msg)
self.print_all_gnames(7)
curses.echo()
self.screen.addstr(3, 0, "Guest [ENTER or guest]: ")
gname = self.screen.getstr()
curses.noecho()
if not gname:
self.refresh_header(0)
self.update_pid(0)
break
else:
pids = []
try:
pids = self.get_pid_from_gname(gname)
except:
msg = '"' + gname + '": Internal error while searching, ' \
'use pid filter instead'
continue
if len(pids) == 0:
msg = '"' + gname + '": Not an active guest'
continue
if len(pids) > 1:
msg = '"' + gname + '": Multiple matches found, use pid ' \
'filter instead'
continue
self.refresh_header(pids[0])
self.update_pid(pids[0])
break
def show_stats(self):
"""Refreshes the screen and processes user input."""
sleeptime = self._delay_initial
self.refresh_header()
start = 0.0 # result based on init value never appears on screen
while True:
self.refresh_body(time.time() - start)
curses.halfdelay(int(sleeptime * 10))
start = time.time()
sleeptime = self._delay_regular
try:
char = self.screen.getkey()
if char == 'b':
self._display_guests = not self._display_guests
if self.stats.toggle_display_guests(self._display_guests):
self.show_msg(['Command not available with tracepoints'
' enabled', 'Restart with debugfs only '
'(see option \'-d\') and try again!'])
self._display_guests = not self._display_guests
self.refresh_header()
if char == 'c':
self.stats.fields_filter = DEFAULT_REGEX
self.refresh_header(0)
self.update_pid(0)
if char == 'f':
curses.curs_set(1)
self.show_filter_selection()
curses.curs_set(0)
sleeptime = self._delay_initial
if char == 'g':
curses.curs_set(1)
self.show_vm_selection_by_guest_name()
curses.curs_set(0)
sleeptime = self._delay_initial
if char == 'h':
self.show_help_interactive()
if char == 'o':
self._sorting = not self._sorting
if char == 'p':
curses.curs_set(1)
self.show_vm_selection_by_pid()
curses.curs_set(0)
sleeptime = self._delay_initial
if char == 'q':
break
if char == 'r':
self.stats.reset()
if char == 's':
curses.curs_set(1)
self.show_set_update_interval()
curses.curs_set(0)
sleeptime = self._delay_initial
if char == 'x':
self.update_drilldown()
# prevents display of current values on next refresh
self.stats.get()
except KeyboardInterrupt:
break
except curses.error:
continue
def batch(stats):
"""Prints statistics in a key, value format."""
try:
s = stats.get()
time.sleep(1)
s = stats.get()
for key in sorted(s.keys()):
values = s[key]
print '%-42s%10d%10d' % (key, values[0], values[1])
except KeyboardInterrupt:
pass
def log(stats):
"""Prints statistics as reiterating key block, multiple value blocks."""
keys = sorted(stats.get().iterkeys())
def banner():
for k in keys:
print '%s' % k,
print
def statline():
s = stats.get()
for k in keys:
print ' %9d' % s[k][1],
print
line = 0
banner_repeat = 20
while True:
try:
time.sleep(1)
if line % banner_repeat == 0:
banner()
statline()
line += 1
except KeyboardInterrupt:
break
def get_options():
"""Returns processed program arguments."""
description_text = """
This script displays various statistics about VMs running under KVM.
The statistics are gathered from the KVM debugfs entries and / or the
currently available perf traces.
The monitoring takes additional cpu cycles and might affect the VM's
performance.
Requirements:
- Access to:
/sys/kernel/debug/kvm
/sys/kernel/debug/trace/events/*
/proc/pid/task
- /proc/sys/kernel/perf_event_paranoid < 1 if user has no
CAP_SYS_ADMIN and perf events are used.
- CAP_SYS_RESOURCE if the hard limit is not high enough to allow
the large number of files that are possibly opened.
Interactive Commands:
b toggle events by guests (debugfs only, honors filters)
c clear filter
f filter by regular expression
g filter by guest name
h display interactive commands reference
o toggle sorting order (Total vs CurAvg/s)
p filter by PID
q quit
r reset stats
s set update interval
x toggle reporting of stats for individual child trace events
Press any other key to refresh statistics immediately.
"""
class PlainHelpFormatter(optparse.IndentedHelpFormatter):
def format_description(self, description):
if description:
return description + "\n"
else:
return ""
def cb_guest_to_pid(option, opt, val, parser):
try:
pids = Tui.get_pid_from_gname(val)
except:
raise optparse.OptionValueError('Error while searching for guest '
'"{}", use "-p" to specify a pid '
'instead'.format(val))
if len(pids) == 0:
raise optparse.OptionValueError('No guest by the name "{}" '
'found'.format(val))
if len(pids) > 1:
raise optparse.OptionValueError('Multiple processes found (pids: '
'{}) - use "-p" to specify a pid '
'instead'.format(" ".join(pids)))
parser.values.pid = pids[0]
optparser = optparse.OptionParser(description=description_text,
formatter=PlainHelpFormatter())
optparser.add_option('-1', '--once', '--batch',
action='store_true',
default=False,
dest='once',
help='run in batch mode for one second',
)
optparser.add_option('-i', '--debugfs-include-past',
action='store_true',
default=False,
dest='dbgfs_include_past',
help='include all available data on past events for '
'debugfs',
)
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=DEFAULT_REGEX,
dest='fields',
help='fields to display (regex)',
)
optparser.add_option('-p', '--pid',
action='store',
default=0,
type='int',
dest='pid',
help='restrict statistics to pid',
)
optparser.add_option('-g', '--guest',
action='callback',
type='string',
dest='pid',
metavar='GUEST',
help='restrict statistics to guest by name',
callback=cb_guest_to_pid,
)
(options, _) = optparser.parse_args(sys.argv)
return options
def check_access(options):
"""Exits if the current user can't access all needed directories."""
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) and (options.tracepoints or
not options.debugfs):
sys.stderr.write("Please enable CONFIG_TRACING in your kernel "
"when using the option -t (default).\n"
"If it is enabled, make {0} readable by the "
"current user.\n"
.format(PATH_DEBUGFS_TRACING))
if options.tracepoints:
sys.exit(1)
sys.stderr.write("Falling back to debugfs statistics!\n")
options.debugfs = True
time.sleep(5)
return options
def main():
options = get_options()
options = check_access(options)
if (options.pid > 0 and
not os.path.isdir(os.path.join('/proc/',
str(options.pid)))):
sys.stderr.write('Did you use a (unsupported) tid instead of a pid?\n')
sys.exit('Specified pid does not exist.')
stats = Stats(options)
if options.log:
log(stats)
elif not options.once:
with Tui(stats) as tui:
tui.show_stats()
else:
batch(stats)
if __name__ == "__main__":
main()
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