#!/usr/bin/python # # top-like utility for displaying kvm statistics # # Copyright 2006-2008 Qumranet Technologies # Copyright 2008-2011 Red Hat, Inc. # # Authors: # Avi Kivity # # 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 from time import sleep 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): """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 __init__(self): super(self.__class__, self).__init__() self.type = PERF_TYPE_TRACEPOINT self.size = ctypes.sizeof(self) self.read_format = PERF_FORMAT_GROUP 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.config = int(open(id_path).read()) 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. newlim = len(cpus) * len(self._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 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) def available_fields(self): return self.get_available_fields() @property def fields(self): return self._fields @fields.setter def fields(self, fields): 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() def read(self): 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 class DebugfsProvider(object): def __init__(self): self._fields = self.get_available_fields() def get_available_fields(self): return 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.get_available_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 class Tui(object): def __init__(self, stats): self.stats = stats self.screen = None self.drilldown = False self.update_drilldown() 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: pass curses.use_default_colors() return self def __exit__(self, *exception): """Resets the terminal to its normal state. Based on curses.wrappre implementation from the Python standard library.""" if self.screen: self.screen.keypad(0) curses.echo() curses.nocbreak() curses.endwin() def update_drilldown(self): if not self.stats.fields_filter: self.stats.fields_filter = r'^[^\(]*$' elif self.stats.fields_filter == r'^[^\(]*$': self.stats.fields_filter = None def refresh(self, sleeptime): self.screen.erase() self.screen.addstr(0, 0, 'kvm statistics - summary', curses.A_BOLD) self.screen.addstr(2, 1, 'Event') self.screen.addstr(2, 1 + LABEL_WIDTH + NUMBER_WIDTH - len('Total'), 'Total') self.screen.addstr(2, 1 + LABEL_WIDTH + NUMBER_WIDTH + 8 - len('Current'), 'Current') row = 3 stats = self.stats.get() def sortkey(x): if stats[x][1]: return (-stats[x][1], -stats[x][0]) else: return (0, -stats[x][0]) 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 col = 1 self.screen.addstr(row, col, key) col += LABEL_WIDTH self.screen.addstr(row, col, '%10d' % (values[0],)) col += NUMBER_WIDTH if values[1] is not None: self.screen.addstr(row, col, '%8d' % (values[1] / sleeptime,)) row += 1 self.screen.refresh() def show_filter_selection(self): 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: return try: re.compile(regex) self.stats.fields_filter = regex return except re.error: continue def show_stats(self): sleeptime = 0.25 while True: self.refresh(sleeptime) curses.halfdelay(int(sleeptime * 10)) sleeptime = 3 try: char = self.screen.getkey() if char == 'x': self.drilldown = not self.drilldown self.update_drilldown() if char == 'q': break if char == 'f': self.show_filter_selection() 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 '%-42s%10d%10d' % (key, values[0], values[1]) def log(stats): 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: time.sleep(1) if line % banner_repeat == 0: banner() statline() line += 1 def get_options(): 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. """ class PlainHelpFormatter(optparse.IndentedHelpFormatter): def format_description(self, description): if description: return description + "\n" else: return "" 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('-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(options): 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 sleep(5) return options def main(): options = get_options() options = check_access(options) providers = get_providers(options) stats = Stats(providers, fields=options.fields) if options.log: log(stats) elif not options.once: with Tui(stats) as tui: tui.show_stats() else: batch(stats) if __name__ == "__main__": main()