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#!/usr/bin/python3 # -*- python -*- # -*- coding: utf-8 -*- # Copyright (C) 2008 Red Hat Inc. # # Arnaldo Carvalho de Melo <acme@redhat.com> # # This application is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public License # as published by the Free Software Foundation; version 2. # # This application is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # General Public License for more details. from __future__ import print_function import os import schedutils import sys def usage(): print('''pchrt (python-schedutils) usage: pchrt [options] [prio] [pid | cmd [args...]] manipulate real-time attributes of a process -b, --batch set policy to SCHED_BATCH -f, --fifo set policy to SCHED_FIFO -i, --idle set policy to SCHED_IDLE -p, --pid operate on existing given pid -m, --max show min and max valid priorities -o, --other set policy to SCHED_OTHER -r, --rr set policy to SCHED_RR (default) -R, --reset-on-fork set SCHED_RESET_ON_FORK for FIFO or RR -h, --help display this help You must give a priority if changing policy. Report bugs and send patches to <tuna-devel@lists.fedorahosted.org>''') return def show_priority_limits(policy): print("%-32.32s: %d/%d" % ( "%s min/max priority" % schedutils.schedstr(policy), schedutils.get_priority_min(policy), schedutils.get_priority_max(policy) )) def show_all_priority_limits(): for policy in (schedutils.SCHED_OTHER, schedutils.SCHED_FIFO, schedutils.SCHED_RR, schedutils.SCHED_BATCH): show_priority_limits(policy) def show_settings(pid): policy = schedutils.get_scheduler(pid) spolicy = schedutils.schedstr(policy) rtprio = schedutils.get_priority(pid) reset_on_fork = "" if policy & schedutils.SCHED_RESET_ON_FORK: reset_on_fork = "|SCHED_RESET_ON_FORK" print('''pid %d's current scheduling policy: %s%s pid %d's current scheduling priority: %d''' % (pid, spolicy, reset_on_fork, pid, rtprio)) def valid_policy_flag(policy, policy_flag): if policy_flag == schedutils.SCHED_RESET_ON_FORK and \ policy not in (schedutils.SCHED_RR, schedutils.SCHED_FIFO): print("SCHED_RESET_ON_FORK flag is supported for SCHED_FIFO and SCHED_RR policies only") return False return True def change_settings(pid, policy, policy_flag, rtprio): try: schedutils.set_scheduler(pid, policy | policy_flag, rtprio) except SystemError as err: print("sched_setscheduler: %s" % err[1]) print("failed to set pid %d's policy" % pid) def main(): args = sys.argv[1:] if not args: usage() return policy = schedutils.SCHED_RR policy_flag = 0 while True: o = args.pop(0) try: priority = int(o) break except: pass if o in ("-h", "--help"): usage() return elif o in ("-b", "--batch"): policy = schedutils.SCHED_BATCH elif o in ("-f", "--fifo"): policy = schedutils.SCHED_FIFO elif o in ("-i", "--idle"): policy = schedutils.SCHED_IDLE elif o in ("-m", "--max"): show_all_priority_limits() return elif o in ("-o", "--other"): policy = schedutils.SCHED_OTHER elif o in ("-r", "--rr"): policy = schedutils.SCHED_RR elif o in ("-R", "--reset-on-fork"): policy_flag |= schedutils.SCHED_RESET_ON_FORK elif o in ("-p", "--pid"): if len(args) > 1: priority = int(args.pop(0)) pid = int(args.pop(0)) if not valid_policy_flag(policy, policy_flag): return change_settings(pid, policy, policy_flag, priority) else: pid = int(args.pop(0)) show_settings(pid) return else: usage() return if not valid_policy_flag(policy, policy_flag): return schedutils.set_scheduler(0, policy | policy_flag, priority) os.execvp(args[0], args) if __name__ == '__main__': main()