Util.py

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# Util.py - Python extension for perf script, miscellaneous utility code
#
# Copyright (C) 2010 by Tom Zanussi <tzanussi@gmail.com>
#
# This software may be distributed under the terms of the GNU General
# Public License ("GPL") version 2 as published by the Free Software
# Foundation.

import errno, os

FUTEX_WAIT = 0
FUTEX_WAKE = 1
FUTEX_PRIVATE_FLAG = 128
FUTEX_CLOCK_REALTIME = 256
FUTEX_CMD_MASK = ~(FUTEX_PRIVATE_FLAG | FUTEX_CLOCK_REALTIME)

NSECS_PER_SEC    = 1000000000

def avg(total, n):
    return total / n

def nsecs(secs, nsecs):
    return secs * NSECS_PER_SEC + nsecs

def nsecs_secs(nsecs):
    return nsecs / NSECS_PER_SEC

def nsecs_nsecs(nsecs):
    return nsecs % NSECS_PER_SEC

def nsecs_str(nsecs):
    str = "%5u.%09u" % (nsecs_secs(nsecs), nsecs_nsecs(nsecs)),
    return str

def add_stats(dict, key, value):
    if not dict.has_key(key):
        dict[key] = (value, value, value, 1)
    else:
        min, max, avg, count = dict[key]
        if value < min:
            min = value
        if value > max:
            max = value
        avg = (avg + value) / 2
        dict[key] = (min, max, avg, count + 1)

def clear_term():
    print("\x1b[H\x1b[2J")

audit_package_warned = False

try:
    import audit
    machine_to_id = {
        'x86_64': audit.MACH_86_64,
        'alpha' : audit.MACH_ALPHA,
        'ia64'  : audit.MACH_IA64,
        'ppc'   : audit.MACH_PPC,
        'ppc64' : audit.MACH_PPC64,
        'ppc64le' : audit.MACH_PPC64LE,
        's390'  : audit.MACH_S390,
        's390x' : audit.MACH_S390X,
        'i386'  : audit.MACH_X86,
        'i586'  : audit.MACH_X86,
        'i686'  : audit.MACH_X86,
    }
    try:
        machine_to_id['armeb'] = audit.MACH_ARMEB
    except:
        pass
    machine_id = machine_to_id[os.uname()[4]]
except:
    if not audit_package_warned:
        audit_package_warned = True
        print "Install the audit-libs-python package to get syscall names.\n" \
                    "For example:\n  # apt-get install python-audit (Ubuntu)" \
                    "\n  # yum install audit-libs-python (Fedora)" \
                    "\n  etc.\n"

def syscall_name(id):
    try:
        return audit.audit_syscall_to_name(id, machine_id)
    except:
        return str(id)

def strerror(nr):
    try:
        return errno.errorcode[abs(nr)]
    except:
        return "Unknown %d errno" % nr