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