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-rwxr-xr-xtools/kvm/kvm_stat/kvm_stat427
-rw-r--r--tools/kvm/kvm_stat/kvm_stat.service17
-rw-r--r--tools/kvm/kvm_stat/kvm_stat.txt53
3 files changed, 353 insertions, 144 deletions
diff --git a/tools/kvm/kvm_stat/kvm_stat b/tools/kvm/kvm_stat/kvm_stat
index 4cf93110c259..6f28180ffeea 100755
--- a/tools/kvm/kvm_stat/kvm_stat
+++ b/tools/kvm/kvm_stat/kvm_stat
@@ -25,24 +25,30 @@ import sys
import locale
import os
import time
-import optparse
+import argparse
import ctypes
import fcntl
import resource
import struct
import re
import subprocess
+import signal
from collections import defaultdict, namedtuple
+from functools import reduce
+from datetime import datetime
VMX_EXIT_REASONS = {
'EXCEPTION_NMI': 0,
'EXTERNAL_INTERRUPT': 1,
'TRIPLE_FAULT': 2,
- 'PENDING_INTERRUPT': 7,
+ 'INIT_SIGNAL': 3,
+ 'SIPI_SIGNAL': 4,
+ 'INTERRUPT_WINDOW': 7,
'NMI_WINDOW': 8,
'TASK_SWITCH': 9,
'CPUID': 10,
'HLT': 12,
+ 'INVD': 13,
'INVLPG': 14,
'RDPMC': 15,
'RDTSC': 16,
@@ -62,26 +68,48 @@ VMX_EXIT_REASONS = {
'MSR_READ': 31,
'MSR_WRITE': 32,
'INVALID_STATE': 33,
+ 'MSR_LOAD_FAIL': 34,
'MWAIT_INSTRUCTION': 36,
+ 'MONITOR_TRAP_FLAG': 37,
'MONITOR_INSTRUCTION': 39,
'PAUSE_INSTRUCTION': 40,
'MCE_DURING_VMENTRY': 41,
'TPR_BELOW_THRESHOLD': 43,
'APIC_ACCESS': 44,
+ 'EOI_INDUCED': 45,
+ 'GDTR_IDTR': 46,
+ 'LDTR_TR': 47,
'EPT_VIOLATION': 48,
'EPT_MISCONFIG': 49,
+ 'INVEPT': 50,
+ 'RDTSCP': 51,
+ 'PREEMPTION_TIMER': 52,
+ 'INVVPID': 53,
'WBINVD': 54,
'XSETBV': 55,
'APIC_WRITE': 56,
+ 'RDRAND': 57,
'INVPCID': 58,
+ 'VMFUNC': 59,
+ 'ENCLS': 60,
+ 'RDSEED': 61,
+ 'PML_FULL': 62,
+ 'XSAVES': 63,
+ 'XRSTORS': 64,
+ 'UMWAIT': 67,
+ 'TPAUSE': 68,
+ 'BUS_LOCK': 74,
+ 'NOTIFY': 75,
}
SVM_EXIT_REASONS = {
'READ_CR0': 0x000,
+ 'READ_CR2': 0x002,
'READ_CR3': 0x003,
'READ_CR4': 0x004,
'READ_CR8': 0x008,
'WRITE_CR0': 0x010,
+ 'WRITE_CR2': 0x012,
'WRITE_CR3': 0x013,
'WRITE_CR4': 0x014,
'WRITE_CR8': 0x018,
@@ -102,6 +130,7 @@ SVM_EXIT_REASONS = {
'WRITE_DR6': 0x036,
'WRITE_DR7': 0x037,
'EXCP_BASE': 0x040,
+ 'LAST_EXCP': 0x05f,
'INTR': 0x060,
'NMI': 0x061,
'SMI': 0x062,
@@ -148,21 +177,45 @@ SVM_EXIT_REASONS = {
'MWAIT': 0x08b,
'MWAIT_COND': 0x08c,
'XSETBV': 0x08d,
+ 'RDPRU': 0x08e,
+ 'EFER_WRITE_TRAP': 0x08f,
+ 'CR0_WRITE_TRAP': 0x090,
+ 'CR1_WRITE_TRAP': 0x091,
+ 'CR2_WRITE_TRAP': 0x092,
+ 'CR3_WRITE_TRAP': 0x093,
+ 'CR4_WRITE_TRAP': 0x094,
+ 'CR5_WRITE_TRAP': 0x095,
+ 'CR6_WRITE_TRAP': 0x096,
+ 'CR7_WRITE_TRAP': 0x097,
+ 'CR8_WRITE_TRAP': 0x098,
+ 'CR9_WRITE_TRAP': 0x099,
+ 'CR10_WRITE_TRAP': 0x09a,
+ 'CR11_WRITE_TRAP': 0x09b,
+ 'CR12_WRITE_TRAP': 0x09c,
+ 'CR13_WRITE_TRAP': 0x09d,
+ 'CR14_WRITE_TRAP': 0x09e,
+ 'CR15_WRITE_TRAP': 0x09f,
+ 'INVPCID': 0x0a2,
'NPF': 0x400,
+ 'AVIC_INCOMPLETE_IPI': 0x401,
+ 'AVIC_UNACCELERATED_ACCESS': 0x402,
+ 'VMGEXIT': 0x403,
}
-# EC definition of HSR (from arch/arm64/include/asm/kvm_arm.h)
+# EC definition of HSR (from arch/arm64/include/asm/esr.h)
AARCH64_EXIT_REASONS = {
'UNKNOWN': 0x00,
- 'WFI': 0x01,
+ 'WFx': 0x01,
'CP15_32': 0x03,
'CP15_64': 0x04,
'CP14_MR': 0x05,
'CP14_LS': 0x06,
'FP_ASIMD': 0x07,
'CP10_ID': 0x08,
+ 'PAC': 0x09,
'CP14_64': 0x0C,
- 'ILL_ISS': 0x0E,
+ 'BTI': 0x0D,
+ 'ILL': 0x0E,
'SVC32': 0x11,
'HVC32': 0x12,
'SMC32': 0x13,
@@ -170,21 +223,26 @@ AARCH64_EXIT_REASONS = {
'HVC64': 0x16,
'SMC64': 0x17,
'SYS64': 0x18,
- 'IABT': 0x20,
- 'IABT_HYP': 0x21,
+ 'SVE': 0x19,
+ 'ERET': 0x1A,
+ 'FPAC': 0x1C,
+ 'SME': 0x1D,
+ 'IMP_DEF': 0x1F,
+ 'IABT_LOW': 0x20,
+ 'IABT_CUR': 0x21,
'PC_ALIGN': 0x22,
- 'DABT': 0x24,
- 'DABT_HYP': 0x25,
+ 'DABT_LOW': 0x24,
+ 'DABT_CUR': 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,
+ 'BREAKPT_LOW': 0x30,
+ 'BREAKPT_CUR': 0x31,
+ 'SOFTSTP_LOW': 0x32,
+ 'SOFTSTP_CUR': 0x33,
+ 'WATCHPT_LOW': 0x34,
+ 'WATCHPT_CUR': 0x35,
'BKPT32': 0x38,
'VECTOR32': 0x3A,
'BRK64': 0x3C,
@@ -217,6 +275,19 @@ USERSPACE_EXIT_REASONS = {
'S390_TSCH': 22,
'EPR': 23,
'SYSTEM_EVENT': 24,
+ 'S390_STSI': 25,
+ 'IOAPIC_EOI': 26,
+ 'HYPERV': 27,
+ 'ARM_NISV': 28,
+ 'X86_RDMSR': 29,
+ 'X86_WRMSR': 30,
+ 'DIRTY_RING_FULL': 31,
+ 'AP_RESET_HOLD': 32,
+ 'X86_BUS_LOCK': 33,
+ 'XEN': 34,
+ 'RISCV_SBI': 35,
+ 'RISCV_CSR': 36,
+ 'NOTIFY': 37,
}
IOCTL_NUMBERS = {
@@ -226,6 +297,8 @@ IOCTL_NUMBERS = {
'RESET': 0x00002403,
}
+signal_received = False
+
ENCODING = locale.getpreferredencoding(False)
TRACE_FILTER = re.compile(r'^[^\(]*$')
@@ -737,7 +810,11 @@ class DebugfsProvider(Provider):
The fields are all available KVM debugfs files
"""
- return self.walkdir(PATH_DEBUGFS_KVM)[2]
+ exempt_list = ['halt_poll_fail_ns', 'halt_poll_success_ns', 'halt_wait_ns']
+ fields = [field for field in self.walkdir(PATH_DEBUGFS_KVM)[2]
+ if field not in exempt_list]
+
+ return fields
def update_fields(self, fields_filter):
"""Refresh fields, applying fields_filter"""
@@ -873,7 +950,7 @@ class Stats(object):
if options.debugfs:
providers.append(DebugfsProvider(options.pid, options.fields,
- options.dbgfs_include_past))
+ options.debugfs_include_past))
if options.tracepoints or not providers:
providers.append(TracepointProvider(options.pid, options.fields))
@@ -974,15 +1051,17 @@ DELAY_DEFAULT = 3.0
MAX_GUEST_NAME_LEN = 48
MAX_REGEX_LEN = 44
SORT_DEFAULT = 0
+MIN_DELAY = 0.1
+MAX_DELAY = 25.5
class Tui(object):
"""Instruments curses to draw a nice text ui."""
- def __init__(self, stats):
+ def __init__(self, stats, opts):
self.stats = stats
self.screen = None
self._delay_initial = 0.25
- self._delay_regular = DELAY_DEFAULT
+ self._delay_regular = opts.set_delay
self._sorting = SORT_DEFAULT
self._display_guests = 0
@@ -1183,7 +1262,7 @@ class Tui(object):
if not self._is_running_guest(self.stats.pid_filter):
if self._gname:
- try: # ...to identify the guest by name in case it's back
+ try: # ...to identify the guest by name in case it's back
pids = self.get_pid_from_gname(self._gname)
if len(pids) == 1:
self._refresh_header(pids[0])
@@ -1282,7 +1361,8 @@ class Tui(object):
' p filter by guest name/PID',
' q quit',
' r reset stats',
- ' s set update interval',
+ ' s set delay between refreshs (value range: '
+ '%s-%s secs)' % (MIN_DELAY, MAX_DELAY),
' x toggle reporting of stats for individual child trace'
' events',
'Any other key refreshes statistics immediately')
@@ -1336,8 +1416,8 @@ class Tui(object):
msg = ''
while True:
self.screen.erase()
- self.screen.addstr(0, 0, 'Set update interval (defaults to %.1fs).' %
- DELAY_DEFAULT, curses.A_BOLD)
+ self.screen.addstr(0, 0, 'Set update interval (defaults to %.1fs).'
+ % DELAY_DEFAULT, curses.A_BOLD)
self.screen.addstr(4, 0, msg)
self.screen.addstr(2, 0, 'Change delay from %.1fs to ' %
self._delay_regular)
@@ -1348,11 +1428,9 @@ class Tui(object):
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'
+ err = is_delay_valid(delay)
+ if err is not None:
+ msg = err
continue
else:
delay = DELAY_DEFAULT
@@ -1488,32 +1566,106 @@ def batch(stats):
pass
-def log(stats):
- """Prints statistics as reiterating key block, multiple value blocks."""
- keys = sorted(stats.get().keys())
-
- def banner():
+class StdFormat(object):
+ def __init__(self, keys):
+ self._banner = ''
for key in keys:
- print(key.split(' ')[0], end=' ')
- print()
+ self._banner += key.split(' ')[0] + ' '
- def statline():
- s = stats.get()
+ def get_banner(self):
+ return self._banner
+
+ def get_statline(self, keys, s):
+ res = ''
for key in keys:
- print(' %9d' % s[key].delta, end=' ')
- print()
+ res += ' %9d' % s[key].delta
+ return res
+
+
+class CSVFormat(object):
+ def __init__(self, keys):
+ self._banner = 'timestamp'
+ self._banner += reduce(lambda res, key: "{},{!s}".format(res,
+ key.split(' ')[0]), keys, '')
+
+ def get_banner(self):
+ return self._banner
+
+ def get_statline(self, keys, s):
+ return reduce(lambda res, key: "{},{!s}".format(res, s[key].delta),
+ keys, '')
+
+
+def log(stats, opts, frmt, keys):
+ """Prints statistics as reiterating key block, multiple value blocks."""
+ global signal_received
line = 0
banner_repeat = 20
+ f = None
+
+ def do_banner(opts):
+ nonlocal f
+ if opts.log_to_file:
+ if not f:
+ try:
+ f = open(opts.log_to_file, 'a')
+ except (IOError, OSError):
+ sys.exit("Error: Could not open file: %s" %
+ opts.log_to_file)
+ if isinstance(frmt, CSVFormat) and f.tell() != 0:
+ return
+ print(frmt.get_banner(), file=f or sys.stdout)
+
+ def do_statline(opts, values):
+ statline = datetime.now().strftime("%Y-%m-%d %H:%M:%S") + \
+ frmt.get_statline(keys, values)
+ print(statline, file=f or sys.stdout)
+
+ do_banner(opts)
+ banner_printed = True
while True:
try:
- time.sleep(1)
- if line % banner_repeat == 0:
- banner()
- statline()
- line += 1
+ time.sleep(opts.set_delay)
+ if signal_received:
+ banner_printed = True
+ line = 0
+ f.close()
+ do_banner(opts)
+ signal_received = False
+ if (line % banner_repeat == 0 and not banner_printed and
+ not (opts.log_to_file and isinstance(frmt, CSVFormat))):
+ do_banner(opts)
+ banner_printed = True
+ values = stats.get()
+ if (not opts.skip_zero_records or
+ any(values[k].delta != 0 for k in keys)):
+ do_statline(opts, values)
+ line += 1
+ banner_printed = False
except KeyboardInterrupt:
break
+ if opts.log_to_file:
+ f.close()
+
+
+def handle_signal(sig, frame):
+ global signal_received
+
+ signal_received = True
+
+ return
+
+
+def is_delay_valid(delay):
+ """Verify delay is in valid value range."""
+ msg = None
+ if delay < MIN_DELAY:
+ msg = '"' + str(delay) + '": Delay must be >=%s' % MIN_DELAY
+ if delay > MAX_DELAY:
+ msg = '"' + str(delay) + '": Delay must be <=%s' % MAX_DELAY
+ return msg
+
def get_options():
"""Returns processed program arguments."""
@@ -1545,89 +1697,98 @@ Interactive Commands:
p filter by PID
q quit
r reset stats
- s set update interval
+ s set update interval (value range: 0.1-25.5 secs)
x toggle reporting of stats for individual child trace events
Press any other key to refresh statistics immediately.
""" % (PATH_DEBUGFS_KVM, PATH_DEBUGFS_TRACING)
- 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:
- sys.exit('Error while searching for guest "{}". Use "-p" to '
- 'specify a pid instead?'.format(val))
- if len(pids) == 0:
- sys.exit('Error: No guest by the name "{}" found'.format(val))
- if len(pids) > 1:
- sys.exit('Error: Multiple processes found (pids: {}). Use "-p" '
- 'to specify the desired pid'.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='',
- dest='fields',
- help='''fields to display (regex)
- "-f help" for a list of available events''',
- )
- 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, unkn = optparser.parse_args(sys.argv)
- if len(unkn) != 1:
- sys.exit('Error: Extra argument(s): ' + ' '.join(unkn[1:]))
+ class Guest_to_pid(argparse.Action):
+ def __call__(self, parser, namespace, values, option_string=None):
+ try:
+ pids = Tui.get_pid_from_gname(values)
+ except:
+ sys.exit('Error while searching for guest "{}". Use "-p" to '
+ 'specify a pid instead?'.format(values))
+ if len(pids) == 0:
+ sys.exit('Error: No guest by the name "{}" found'
+ .format(values))
+ if len(pids) > 1:
+ sys.exit('Error: Multiple processes found (pids: {}). Use "-p"'
+ ' to specify the desired pid'
+ .format(" ".join(map(str, pids))))
+ namespace.pid = pids[0]
+
+ argparser = argparse.ArgumentParser(description=description_text,
+ formatter_class=argparse
+ .RawTextHelpFormatter)
+ argparser.add_argument('-1', '--once', '--batch',
+ action='store_true',
+ default=False,
+ help='run in batch mode for one second',
+ )
+ argparser.add_argument('-c', '--csv',
+ action='store_true',
+ default=False,
+ help='log in csv format - requires option -l/-L',
+ )
+ argparser.add_argument('-d', '--debugfs',
+ action='store_true',
+ default=False,
+ help='retrieve statistics from debugfs',
+ )
+ argparser.add_argument('-f', '--fields',
+ default='',
+ help='''fields to display (regex)
+"-f help" for a list of available events''',
+ )
+ argparser.add_argument('-g', '--guest',
+ type=str,
+ help='restrict statistics to guest by name',
+ action=Guest_to_pid,
+ )
+ argparser.add_argument('-i', '--debugfs-include-past',
+ action='store_true',
+ default=False,
+ help='include all available data on past events for'
+ ' debugfs',
+ )
+ argparser.add_argument('-l', '--log',
+ action='store_true',
+ default=False,
+ help='run in logging mode (like vmstat)',
+ )
+ argparser.add_argument('-L', '--log-to-file',
+ type=str,
+ metavar='FILE',
+ help="like '--log', but logging to a file"
+ )
+ argparser.add_argument('-p', '--pid',
+ type=int,
+ default=0,
+ help='restrict statistics to pid',
+ )
+ argparser.add_argument('-s', '--set-delay',
+ type=float,
+ default=DELAY_DEFAULT,
+ metavar='DELAY',
+ help='set delay between refreshs (value range: '
+ '%s-%s secs)' % (MIN_DELAY, MAX_DELAY),
+ )
+ argparser.add_argument('-t', '--tracepoints',
+ action='store_true',
+ default=False,
+ help='retrieve statistics from tracepoints',
+ )
+ argparser.add_argument('-z', '--skip-zero-records',
+ action='store_true',
+ default=False,
+ help='omit records with all zeros in logging mode',
+ )
+ options = argparser.parse_args()
+ if options.csv and not (options.log or options.log_to_file):
+ sys.exit('Error: Option -c/--csv requires -l/--log')
+ if options.skip_zero_records and not (options.log or options.log_to_file):
+ sys.exit('Error: Option -z/--skip-zero-records requires -l/-L')
try:
# verify that we were passed a valid regex up front
re.compile(options.fields)
@@ -1663,7 +1824,7 @@ def assign_globals():
debugfs = ''
for line in open('/proc/mounts'):
- if line.split(' ')[0] == 'debugfs':
+ if line.split(' ')[2] == 'debugfs':
debugfs = line.split(' ')[1]
break
if debugfs == '':
@@ -1693,6 +1854,10 @@ def main():
sys.stderr.write('Did you use a (unsupported) tid instead of a pid?\n')
sys.exit('Specified pid does not exist.')
+ err = is_delay_valid(options.set_delay)
+ if err is not None:
+ sys.exit('Error: ' + err)
+
stats = Stats(options)
if options.fields == 'help':
@@ -1703,13 +1868,21 @@ def main():
sys.stdout.write(' ' + '\n '.join(sorted(set(event_list))) + '\n')
sys.exit(0)
- if options.log:
- log(stats)
+ if options.log or options.log_to_file:
+ if options.log_to_file:
+ signal.signal(signal.SIGHUP, handle_signal)
+ keys = sorted(stats.get().keys())
+ if options.csv:
+ frmt = CSVFormat(keys)
+ else:
+ frmt = StdFormat(keys)
+ log(stats, options, frmt, keys)
elif not options.once:
- with Tui(stats) as tui:
+ with Tui(stats, options) as tui:
tui.show_stats()
else:
batch(stats)
+
if __name__ == "__main__":
main()
diff --git a/tools/kvm/kvm_stat/kvm_stat.service b/tools/kvm/kvm_stat/kvm_stat.service
new file mode 100644
index 000000000000..8f13b843d5b4
--- /dev/null
+++ b/tools/kvm/kvm_stat/kvm_stat.service
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+[Unit]
+Description=Service that logs KVM kernel module trace events
+Before=qemu-kvm.service
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/kvm_stat -dtcz -s 10 -L /var/log/kvm_stat.csv
+ExecReload=/bin/kill -HUP $MAINPID
+Restart=always
+RestartSec=60s
+SyslogIdentifier=kvm_stat
+SyslogLevel=debug
+
+[Install]
+WantedBy=multi-user.target
diff --git a/tools/kvm/kvm_stat/kvm_stat.txt b/tools/kvm/kvm_stat/kvm_stat.txt
index c057ba52364e..3a9f2037bd23 100644
--- a/tools/kvm/kvm_stat/kvm_stat.txt
+++ b/tools/kvm/kvm_stat/kvm_stat.txt
@@ -49,7 +49,7 @@ INTERACTIVE COMMANDS
*r*:: reset stats
-*s*:: set update interval
+*s*:: set delay between refreshs
*x*:: toggle reporting of stats for child trace events
:: *Note*: The stats for the parents summarize the respective child trace
@@ -64,37 +64,56 @@ OPTIONS
--batch::
run in batch mode for one second
--l::
---log::
- run in logging mode (like vmstat)
-
--t::
---tracepoints::
- retrieve statistics from tracepoints
+-c::
+--csv::
+ log in csv format. Requires option -l/--log or -L/--log-to-file.
+ When used with option -L/--log-to-file, the header is only ever
+ written to start of file to preserve the format.
-d::
--debugfs::
retrieve statistics from debugfs
+-f<fields>::
+--fields=<fields>::
+ fields to display (regex), "-f help" for a list of available events
+
+-g<guest>::
+--guest=<guest_name>::
+ limit statistics to one virtual machine (guest name)
+
+-h::
+--help::
+ show help message
+
-i::
--debugfs-include-past::
include all available data on past events for debugfs
+-l::
+--log::
+ run in logging mode (like vmstat)
+
+
+-L<file>::
+--log-to-file=<file>::
+ like -l/--log, but logging to a file. Appends to existing files.
+
-p<pid>::
--pid=<pid>::
limit statistics to one virtual machine (pid)
--g<guest>::
---guest=<guest_name>::
- limit statistics to one virtual machine (guest name)
+-s::
+--set-delay::
+ set delay between refreshs (value range: 0.1-25.5 secs)
--f<fields>::
---fields=<fields>::
- fields to display (regex), "-f help" for a list of available events
+-t::
+--tracepoints::
+ retrieve statistics from tracepoints
--h::
---help::
- show help message
+-z::
+--skip-zero-records::
+ omit records with all zeros in logging mode
SEE ALSO
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Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.