Orange Pi5 kernel

#! /usr/bin/env python
# SPDX-License-Identifier: GPL-2.0-only
# -*- python -*-
# -*- coding: utf-8 -*-
#   twatch - Experimental use of the perf python interface
#   Copyright (C) 2011 Arnaldo Carvalho de Melo <acme@redhat.com>
#
 
import perf
 
def main(context_switch = 0, thread = -1):
<------>cpus = perf.cpu_map()
<------>threads = perf.thread_map(thread)
<------>evsel = perf.evsel(type	  = perf.TYPE_SOFTWARE,
<------><------><------>   config = perf.COUNT_SW_DUMMY,
<------><------><------>   task = 1, comm = 1, mmap = 0, freq = 0,
<------><------><------>   wakeup_events = 1, watermark = 1,
<------><------><------>   sample_id_all = 1, context_switch = context_switch,
<------><------><------>   sample_type = perf.SAMPLE_PERIOD | perf.SAMPLE_TID | perf.SAMPLE_CPU)
 
<------>"""What we want are just the PERF_RECORD_ lifetime events for threads,
<------> using the default, PERF_TYPE_HARDWARE + PERF_COUNT_HW_CYCLES & freq=1
<------> (the default), makes perf reenable irq_vectors:local_timer_entry, when
<------> disabling nohz, not good for some use cases where all we want is to get
<------> threads comes and goes... So use (perf.TYPE_SOFTWARE, perf_COUNT_SW_DUMMY,
<------> freq=0) instead."""
 
<------>evsel.open(cpus = cpus, threads = threads);
<------>evlist = perf.evlist(cpus, threads)
<------>evlist.add(evsel)
<------>evlist.mmap()
<------>while True:
<------><------>evlist.poll(timeout = -1)
<------><------>for cpu in cpus:
<------><------><------>event = evlist.read_on_cpu(cpu)
<------><------><------>if not event:
<------><------><------><------>continue
<------><------><------>print("cpu: {0}, pid: {1}, tid: {2} {3}".format(event.sample_cpu,
                                                                        event.sample_pid,
                                                                        event.sample_tid,
                                                                        event))
 
if __name__ == '__main__':
    """
<------>To test the PERF_RECORD_SWITCH record, pick a pid and replace
<------>in the following line.
 
<------>Example output:
 
cpu: 3, pid: 31463, tid: 31593 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31593, switch_out: 1 }
cpu: 1, pid: 31463, tid: 31489 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31489, switch_out: 1 }
cpu: 2, pid: 31463, tid: 31496 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31496, switch_out: 1 }
cpu: 3, pid: 31463, tid: 31491 { type: context_switch, next_prev_pid: 31463, next_prev_tid: 31491, switch_out: 0 }
 
<------>It is possible as well to use event.misc & perf.PERF_RECORD_MISC_SWITCH_OUT
<------>to figure out if this is a context switch in or out of the monitored threads.
 
<------>If bored, please add command line option parsing support for these options :-)
    """
    # main(context_switch = 1, thread = 31463)
    main()