LXR qemu/scripts/analyse-locks-simpletrace.py

   1#!/usr/bin/env python3
   2# -*- coding: utf-8 -*-
   3#
   4# Analyse lock events and compute statistics
   5#
   6# Author: Alex Bennée <alex.bennee@linaro.org>
   7#
   8
   9import simpletrace
  10import argparse
  11import numpy as np
  12
  13class MutexAnalyser(simpletrace.Analyzer):
  14    "A simpletrace Analyser for checking locks."
  15
  16    def __init__(self):
  17        self.locks = 0
  18        self.locked = 0
  19        self.unlocks = 0
  20        self.mutex_records = {}
  21
  22    def _get_mutex(self, mutex):
  23        if not mutex in self.mutex_records:
  24            self.mutex_records[mutex] = {"locks": 0,
  25                                         "lock_time": 0,
  26                                         "acquire_times": [],
  27                                         "locked": 0,
  28                                         "locked_time": 0,
  29                                         "held_times": [],
  30                                         "unlocked": 0}
  31
  32        return self.mutex_records[mutex]
  33
  34    def qemu_mutex_lock(self, timestamp, mutex, filename, line):
  35        self.locks += 1
  36        rec = self._get_mutex(mutex)
  37        rec["locks"] += 1
  38        rec["lock_time"] = timestamp[0]
  39        rec["lock_loc"] = (filename, line)
  40
  41    def qemu_mutex_locked(self, timestamp, mutex, filename, line):
  42        self.locked += 1
  43        rec = self._get_mutex(mutex)
  44        rec["locked"] += 1
  45        rec["locked_time"] = timestamp[0]
  46        acquire_time = rec["locked_time"] - rec["lock_time"]
  47        rec["locked_loc"] = (filename, line)
  48        rec["acquire_times"].append(acquire_time)
  49
  50    def qemu_mutex_unlock(self, timestamp, mutex, filename, line):
  51        self.unlocks += 1
  52        rec = self._get_mutex(mutex)
  53        rec["unlocked"] += 1
  54        held_time = timestamp[0] - rec["locked_time"]
  55        rec["held_times"].append(held_time)
  56        rec["unlock_loc"] = (filename, line)
  57
  58
  59def get_args():
  60    "Grab options"
  61    parser = argparse.ArgumentParser()
  62    parser.add_argument("--output", "-o", type=str, help="Render plot to file")
  63    parser.add_argument("events", type=str, help='trace file read from')
  64    parser.add_argument("tracefile", type=str, help='trace file read from')
  65    return parser.parse_args()
  66
  67if __name__ == '__main__':
  68    args = get_args()
  69
  70    # Gather data from the trace
  71    analyser = MutexAnalyser()
  72    simpletrace.process(args.events, args.tracefile, analyser)
  73
  74    print ("Total locks: %d, locked: %d, unlocked: %d" %
  75           (analyser.locks, analyser.locked, analyser.unlocks))
  76
  77    # Now dump the individual lock stats
  78    for key, val in sorted(analyser.mutex_records.iteritems(),
  79                           key=lambda k_v: k_v[1]["locks"]):
  80        print ("Lock: %#x locks: %d, locked: %d, unlocked: %d" %
  81               (key, val["locks"], val["locked"], val["unlocked"]))
  82
  83        acquire_times = np.array(val["acquire_times"])
  84        if len(acquire_times) > 0:
  85            print ("  Acquire Time: min:%d median:%d avg:%.2f max:%d" %
  86                   (acquire_times.min(), np.median(acquire_times),
  87                    acquire_times.mean(), acquire_times.max()))
  88
  89        held_times = np.array(val["held_times"])
  90        if len(held_times) > 0:
  91            print ("  Held Time: min:%d median:%d avg:%.2f max:%d" %
  92                   (held_times.min(), np.median(held_times),
  93                    held_times.mean(), held_times.max()))
  94
  95        # Check if any locks still held
  96        if val["locks"] > val["locked"]:
  97            print ("  LOCK HELD (%s:%s)" % (val["locked_loc"]))
  98            print ("  BLOCKED   (%s:%s)" % (val["lock_loc"]))
  99