#!/usr/bin/env python
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# Copyright (C) 2015 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the 'License');
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an 'AS IS' BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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Generates storage benchmark from captured strace output.
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Currently assumes that all mmap'ed regions are resource accesses, and emulates as pread().
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Usage:
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$ adb shell strace -p `pid zygote` -o /data/local/tmp/trace -f -ff -y -ttt -e trace=file,desc,munmap
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$ adb pull /data/local/tmp/trace*
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$ python benchgen.py trace.*
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"""
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import re, sys, collections, traceback, argparse
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from operator import itemgetter
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from collections import defaultdict
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class Event:
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def __init__(self, thread, time, call, args, ret):
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self.thread = thread
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self.time = time
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self.call = call
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self.args = args
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self.ret = ret
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def __repr__(self):
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return "%s(%s)=%s" % (self.call, repr(self.args), self.ret)
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class File:
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def __init__(self, name, ident):
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self.name = name
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self.ident = ident
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self.size = 0
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def __repr__(self):
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return self.name
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events = []
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files = {}
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def find_file(name):
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name = name.strip('<>"')
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if name not in files:
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files[name] = File(name, len(files))
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return files[name]
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def extract_file(e, arg):
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if "<" in arg:
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fd, path = arg.split("<")
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path = path.strip(">")
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handle = "t%sf%s" % (e.thread, fd)
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return (fd, find_file(path), handle)
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else:
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return (None, None, None)
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def parse_args(s):
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args = []
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arg = ""
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esc = False
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quot = False
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for c in s:
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if esc:
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esc = False
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arg += c
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continue
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if c == '"':
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if quot:
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quot = False
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continue
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else:
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quot = True
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continue
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if c == '\\':
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esc = True
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continue
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if c == ',' and not quot:
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args.append(arg.strip())
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arg = ""
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else:
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arg += c
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args.append(arg.strip())
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return args
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bufsize = 1048576
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interesting = ["mmap2","read","write","pread64","pwrite64","fsync","fdatasync","openat","close","lseek","_llseek"]
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re_event = re.compile(r"^([\d\.]+) (.+?)\((.+?)\) = (.+?)$")
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re_arg = re.compile(r'''((?:[^,"']|"[^"]*"|'[^']*')+)''')
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for fn in sys.argv[1:]:
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with open(fn) as f:
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thread = int(fn.split(".")[-1])
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for line in f:
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line = re_event.match(line)
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if not line: continue
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time, call, args, ret = line.groups()
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if call not in interesting: continue
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if "/data/" not in args: continue
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time = float(time)
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args = parse_args(args)
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events.append(Event(thread, time, call, args, ret))
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with open("BenchmarkGen.h", 'w') as bench:
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print >>bench, """/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/******************************************************************
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* THIS CODE WAS GENERATED BY benchgen.py, DO NOT MODIFY DIRECTLY *
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******************************************************************/
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#include <android-base/logging.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/sendfile.h>
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#include <fcntl.h>
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#include <algorithm>
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#include <functional>
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#include <string>
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#include <Utils.h>
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namespace android {
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namespace vold {
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static status_t BenchmarkRun(std::function<bool(int)> checkpoint) {
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"""
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print >>bench, "char* buf = (char*) malloc(%d);" % (bufsize)
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nread = 0
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nwrite = 0
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nsync = 0
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events = sorted(events, key=lambda e: e.time)
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active = set()
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defined = set()
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i = 0
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total = len(events)
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for e in events:
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i += 1
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if i % 256 == 0:
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print >>bench, "if (!checkpoint(%d)) return -1;" % (50 + ((i * 50) / total))
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if e.call == "openat":
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fd, f, handle = extract_file(e, e.ret)
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if f:
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active.add(handle)
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if handle not in defined:
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print >>bench, "int",
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defined.add(handle)
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create_mode = ''
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if 'O_CREAT' in e.args[2]:
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assert len(e.args) > 3, 'File creation lacks a mode?'
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create_mode = ', ' + e.args[3]
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print >>bench, '%s = TEMP_FAILURE_RETRY(open("file%s", %s%s));' \
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% (handle, f.ident, e.args[2], create_mode)
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elif e.call == "close":
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fd, f, handle = extract_file(e, e.args[0])
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if handle in active:
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active.remove(handle)
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print >>bench, 'close(%s);' % (handle)
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elif e.call == "lseek":
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fd, f, handle = extract_file(e, e.args[0])
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if handle in active:
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print >>bench, 'TEMP_FAILURE_RETRY(lseek(%s, %s, %s));' % (handle, e.args[1], e.args[2])
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elif e.call == "_llseek":
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fd, f, handle = extract_file(e, e.args[0])
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if handle in active:
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print >>bench, 'TEMP_FAILURE_RETRY(lseek(%s, %s, %s));' % (handle, e.args[1], e.args[3])
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elif e.call == "read":
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fd, f, handle = extract_file(e, e.args[0])
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if handle in active:
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# TODO: track actual file size instead of guessing
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count = min(int(e.args[2]), bufsize)
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f.size += count
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print >>bench, 'TEMP_FAILURE_RETRY(read(%s, buf, %d));' % (handle, count)
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nread += 1
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elif e.call == "write":
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fd, f, handle = extract_file(e, e.args[0])
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if handle in active:
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# TODO: track actual file size instead of guessing
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count = min(int(e.args[2]), bufsize)
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f.size += count
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print >>bench, 'TEMP_FAILURE_RETRY(write(%s, buf, %d));' % (handle, count)
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nwrite += 1
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elif e.call == "pread64":
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fd, f, handle = extract_file(e, e.args[0])
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if handle in active:
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f.size = max(f.size, int(e.args[2]) + int(e.args[3]))
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count = min(int(e.args[2]), bufsize)
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print >>bench, 'TEMP_FAILURE_RETRY(pread(%s, buf, %d, %s));' % (handle, count, e.args[3])
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nread += 1
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elif e.call == "pwrite64":
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fd, f, handle = extract_file(e, e.args[0])
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if handle in active:
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f.size = max(f.size, int(e.args[2]) + int(e.args[3]))
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count = min(int(e.args[2]), bufsize)
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print >>bench, 'TEMP_FAILURE_RETRY(pwrite(%s, buf, %d, %s));' % (handle, count, e.args[3])
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nwrite += 1
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elif e.call == "fsync":
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fd, f, handle = extract_file(e, e.args[0])
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if handle in active:
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print >>bench, 'TEMP_FAILURE_RETRY(fsync(%s));' % (handle)
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nsync += 1
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elif e.call == "fdatasync":
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fd, f, handle = extract_file(e, e.args[0])
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if handle in active:
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print >>bench, 'TEMP_FAILURE_RETRY(fdatasync(%s));' % (handle)
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nsync += 1
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elif e.call == "mmap2":
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fd, f, handle = extract_file(e, e.args[4])
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if handle in active:
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count = min(int(e.args[1]), bufsize)
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offset = int(e.args[5], 0)
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f.size = max(f.size, count + offset)
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print >>bench, 'TEMP_FAILURE_RETRY(pread(%s, buf, %s, %s)); // mmap2' % (handle, count, offset)
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nread += 1
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for handle in active:
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print >>bench, 'close(%s);' % (handle)
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print >>bench, """
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free(buf);
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return 0;
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}
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static status_t CreateFile(const char* name, int len) {
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int chunk = std::min(len, 65536);
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int out = -1;
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std::string buf;
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if (android::vold::ReadRandomBytes(chunk, buf) != OK) {
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LOG(ERROR) << "Failed to read random data";
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return -EIO;
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}
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if ((out = TEMP_FAILURE_RETRY(open(name, O_WRONLY|O_CREAT|O_TRUNC, 0644))) < 0) {
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PLOG(ERROR) << "Failed to open " << name;
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return -errno;
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}
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while (len > 0) {
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int n = write(out, buf.c_str(), std::min(len, chunk));
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if (n < 0) {
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PLOG(ERROR) << "Failed to write";
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close(out);
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return -errno;
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}
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len -= n;
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}
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close(out);
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return OK;
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}
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static status_t BenchmarkCreate(std::function<bool(int)> checkpoint) {
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status_t res = 0;
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res |= CreateFile("stub", 0);
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"""
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i = 0
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total = len(files.values())
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for f in files.values():
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i += 1
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if i % 12 == 0:
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print >>bench, "if (!checkpoint(%d)) return -1;" % ((i * 50) / total)
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print >>bench, 'res |= CreateFile("file%s", %d);' % (f.ident, f.size)
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print >>bench, """
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return res;
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}
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static status_t BenchmarkDestroy() {
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status_t res = 0;
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res |= unlink("stub");
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"""
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for f in files.values():
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print >>bench, 'res |= unlink("file%s");' % (f.ident)
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print >>bench, """
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return res;
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}
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static std::string BenchmarkIdent() {"""
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print >>bench, """return "r%d:w%d:s%d";""" % (nread, nwrite, nsync)
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print >>bench, """}
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} // namespace vold
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} // namespace android
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"""
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size = sum([ f.size for f in files.values() ])
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print "Found", len(files), "data files accessed, total size", (size/1024), "kB"
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types = defaultdict(int)
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for e in events:
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types[e.call] += 1
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print "Found syscalls:"
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for t, n in types.iteritems():
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print str(n).rjust(8), t
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print
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