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platform_system_vold/bench/inodeop_bench/inodeop_bench.cpp
Stefano Duo 0014019b8c bench: Add fail-fast error path to inodeop_bench 
If one of the repeated operations specified by a command fails, report
the error to the user and don't export its metric.

Test: Manual run on physical device
Bug: 165903680
Signed-off-by: Stefano Duo <stefanoduo@google.com>
Change-Id: I3a8caeb6d878b004d89e425bc166c8505fda938a
2020-09-18 15:50:04 +00:00

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/*
* Copyright (C) 2020 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.
*/
#include <chrono>
#include <functional>
#include <iostream>
#include <ratio>
#include <sstream>
#include <string>
#include <unordered_map>
#include <vector>
#include <dirent.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
static constexpr char VERSION[] = "0";
// Self-contained class for collecting and reporting benchmark metrics
// (currently only execution time).
class Collector {
using time_point = std::chrono::time_point<std::chrono::steady_clock>;
using time_unit = std::chrono::duration<double, std::milli>;
struct Metric {
std::string workload;
time_unit exec_time;
Metric(const std::string& workload, const time_unit& exec_time)
: workload(workload), exec_time(exec_time) {}
};
static constexpr char TIME_UNIT[] = "ms";
static constexpr char VERSION[] = "0";
std::vector<Metric> metrics;
time_point reset_time;
public:
Collector() { reset(); }
void reset() { reset_time = std::chrono::steady_clock::now(); }
void collect_metric(const std::string& workload) {
auto elapsed = std::chrono::steady_clock::now() - reset_time;
metrics.emplace_back(workload, std::chrono::duration_cast<time_unit>(elapsed));
}
void report_metrics() {
for (const Metric& metric : metrics)
std::cout << VERSION << ";" << metric.workload << ";" << metric.exec_time.count() << ";"
<< TIME_UNIT << std::endl;
}
};
struct Command {
static constexpr char CREATE[] = "create";
static constexpr char DELETE[] = "delete";
static constexpr char MOVE[] = "move";
static constexpr char HARDLINK[] = "hardlink";
static constexpr char SYMLINK[] = "symlink";
static constexpr char READDIR[] = "readdir";
std::string workload;
std::string from_dir;
std::string from_basename;
std::string to_dir;
std::string to_basename;
bool drop_state;
int n_file;
Command() { reset(); }
std::string to_string() const {
std::stringstream string_repr;
string_repr << "Command {\n";
string_repr << "\t.workload = " << workload << ",\n";
string_repr << "\t.from_dir = " << from_dir << ",\n";
string_repr << "\t.from_basename = " << from_basename << ",\n";
string_repr << "\t.to_dir = " << to_dir << ",\n";
string_repr << "\t.to_basename = " << to_basename << ",\n";
string_repr << "\t.drop_state = " << drop_state << ",\n";
string_repr << "\t.n_file = " << n_file << "\n";
string_repr << "}\n";
return string_repr.str();
}
void reset() {
workload = "";
from_dir = to_dir = "./";
from_basename = "from_file";
to_basename = "to_file";
drop_state = true;
n_file = 0;
}
};
void print_version() {
std::cout << VERSION << std::endl;
}
void print_commands(const std::vector<Command>& commands) {
for (const Command& command : commands) std::cout << command.to_string();
}
void usage(std::ostream& ostr, const std::string& program_name) {
Command command;
ostr << "Usage: " << program_name << " [global_options] {[workload_options] -w WORKLOAD_T}\n";
ostr << "WORKLOAD_T = {" << Command::CREATE << ", " << Command::DELETE << ", " << Command::MOVE
<< ", " << Command::HARDLINK << ", " << Command::SYMLINK << "}\n";
ostr << "Global options\n";
ostr << "\t-v: Print version.\n";
ostr << "\t-p: Print parsed workloads and exit.\n";
ostr << "Workload options\n";
ostr << "\t-d DIR\t\t: Work directory for " << Command::CREATE << "/" << Command::DELETE
<< " (default '" << command.from_dir << "').\n";
ostr << "\t-f FROM-DIR\t: Source directory for " << Command::MOVE << "/" << Command::SYMLINK
<< "/" << Command::HARDLINK << " (default '" << command.from_dir << "').\n";
ostr << "\t-t TO-DIR\t: Destination directory for " << Command::MOVE << "/" << Command::SYMLINK
<< "/" << Command::HARDLINK << " (default '" << command.to_dir << "').\n";
ostr << "\t-n N_FILES\t: Number of files to create/delete etc. (default " << command.n_file
<< ").\n";
ostr << "\t-s\t\t: Do not drop state (caches) before running the workload (default "
<< !command.drop_state << ").\n";
ostr << "NOTE: -w WORKLOAD_T defines a new command and must come after its workload_options."
<< std::endl;
}
void drop_state() {
// Drop inode/dentry/page caches.
std::system("sync; echo 3 > /proc/sys/vm/drop_caches");
}
static constexpr int OPEN_DIR_FLAGS = O_RDONLY | O_DIRECTORY | O_PATH | O_CLOEXEC;
bool delete_files(const std::string& dir, int n_file, const std::string& basename) {
int dir_fd = open(dir.c_str(), OPEN_DIR_FLAGS);
if (dir_fd == -1) {
int error = errno;
std::cerr << "Failed to open work directory '" << dir << "', error '" << strerror(error)
<< "'." << std::endl;
return false;
}
bool ret = true;
for (int i = 0; i < n_file; i++) {
std::string filename = basename + std::to_string(i);
ret = ret && (unlinkat(dir_fd, filename.c_str(), 0) == 0);
}
if (!ret) std::cerr << "Failed to delete at least one of the files" << std::endl;
close(dir_fd);
return ret;
}
bool create_files(const std::string& dir, int n_file, const std::string& basename) {
int dir_fd = open(dir.c_str(), OPEN_DIR_FLAGS);
if (dir_fd == -1) {
int error = errno;
std::cerr << "Failed to open work directory '" << dir << "', error '" << strerror(error)
<< "'." << std::endl;
return false;
}
bool ret = true;
for (int i = 0; i < n_file; i++) {
std::string filename = basename + std::to_string(i);
int fd = openat(dir_fd, filename.c_str(), O_RDWR | O_CREAT | O_EXCL | O_CLOEXEC, 0777);
ret = ret && fd != -1;
close(fd);
}
close(dir_fd);
if (!ret) {
std::cerr << "Failed to open at least one of the files" << std::endl;
delete_files(dir, n_file, basename);
}
return ret;
}
bool move_files(const std::string& from_dir, const std::string& to_dir, int n_file,
const std::string& from_basename, const std::string& to_basename) {
int from_dir_fd = open(from_dir.c_str(), OPEN_DIR_FLAGS);
if (from_dir_fd == -1) {
int error = errno;
std::cerr << "Failed to open source directory '" << from_dir << "', error '"
<< strerror(error) << "'." << std::endl;
return false;
}
int to_dir_fd = open(to_dir.c_str(), OPEN_DIR_FLAGS);
if (to_dir_fd == -1) {
int error = errno;
std::cerr << "Failed to open destination directory '" << to_dir << "', error '"
<< strerror(error) << "'." << std::endl;
close(from_dir_fd);
return false;
}
bool ret = true;
for (int i = 0; i < n_file; i++) {
std::string from_filename = from_basename + std::to_string(i);
std::string to_filename = to_basename + std::to_string(i);
ret = ret &&
(renameat(from_dir_fd, from_filename.c_str(), to_dir_fd, to_filename.c_str()) == 0);
}
if (!ret) std::cerr << "Failed to move at least one of the files" << std::endl;
close(from_dir_fd);
close(from_dir_fd);
return ret;
}
bool hardlink_files(const std::string& from_dir, const std::string& to_dir, int n_file,
const std::string& from_basename, const std::string& to_basename) {
int from_dir_fd = open(from_dir.c_str(), OPEN_DIR_FLAGS);
if (from_dir_fd == -1) {
int error = errno;
std::cerr << "Failed to open source directory '" << from_dir << "', error '"
<< strerror(error) << "'." << std::endl;
return false;
}
int to_dir_fd = open(to_dir.c_str(), OPEN_DIR_FLAGS);
if (to_dir_fd == -1) {
int error = errno;
std::cerr << "Failed to open destination directory '" << to_dir << "', error '"
<< strerror(error) << "'." << std::endl;
close(from_dir_fd);
return false;
}
bool ret = true;
for (int i = 0; i < n_file; i++) {
std::string from_filename = from_basename + std::to_string(i);
std::string to_filename = to_basename + std::to_string(i);
ret = ret &&
(linkat(from_dir_fd, from_filename.c_str(), to_dir_fd, to_filename.c_str(), 0) == 0);
}
if (!ret) std::cerr << "Failed to hardlink at least one of the files" << std::endl;
close(from_dir_fd);
close(to_dir_fd);
return ret;
}
bool symlink_files(std::string from_dir, const std::string& to_dir, int n_file,
const std::string& from_basename, const std::string& to_basename) {
if (from_dir.back() != '/') from_dir.push_back('/');
int to_dir_fd = open(to_dir.c_str(), OPEN_DIR_FLAGS);
if (to_dir_fd == -1) {
int error = errno;
std::cerr << "Failed to open destination directory '" << to_dir << "', error '"
<< strerror(error) << "'." << std::endl;
return false;
}
bool ret = true;
for (int i = 0; i < n_file; i++) {
std::string from_filepath = from_dir + from_basename + std::to_string(i);
std::string to_filename = to_basename + std::to_string(i);
ret = ret && (symlinkat(from_filepath.c_str(), to_dir_fd, to_filename.c_str()) == 0);
}
if (!ret) std::cerr << "Failed to symlink at least one of the files" << std::endl;
close(to_dir_fd);
return ret;
}
bool exhaustive_readdir(const std::string& from_dir) {
DIR* dir = opendir(from_dir.c_str());
if (dir == nullptr) {
int error = errno;
std::cerr << "Failed to open working directory '" << from_dir << "', error '"
<< strerror(error) << "'." << std::endl;
return false;
}
errno = 0;
while (readdir(dir) != nullptr)
;
// In case of failure readdir returns nullptr and sets errno accordingly (to
// something != 0).
// In case of success readdir != nullptr and errno is not changed.
// Source: man 3 readdir.
bool ret = errno == 0;
closedir(dir);
return ret;
}
void create_workload(Collector* collector, const Command& command) {
if (command.drop_state) drop_state();
collector->reset();
if (create_files(command.from_dir, command.n_file, command.from_basename))
collector->collect_metric(command.workload);
delete_files(command.from_dir, command.n_file, command.from_basename);
}
void delete_workload(Collector* collector, const Command& command) {
if (!create_files(command.from_dir, command.n_file, command.from_basename)) return;
if (command.drop_state) drop_state();
collector->reset();
if (delete_files(command.from_dir, command.n_file, command.from_basename))
collector->collect_metric(command.workload);
}
void move_workload(Collector* collector, const Command& command) {
if (!create_files(command.from_dir, command.n_file, command.from_basename)) return;
if (command.drop_state) drop_state();
collector->reset();
if (move_files(command.from_dir, command.to_dir, command.n_file, command.from_basename,
command.to_basename))
collector->collect_metric(command.workload);
delete_files(command.to_dir, command.n_file, command.to_basename);
}
void hardlink_workload(Collector* collector, const Command& command) {
if (!create_files(command.from_dir, command.n_file, command.from_basename)) return;
if (command.drop_state) drop_state();
collector->reset();
if (hardlink_files(command.from_dir, command.to_dir, command.n_file, command.from_basename,
command.to_basename))
collector->collect_metric(command.workload);
delete_files(command.from_dir, command.n_file, command.from_basename);
delete_files(command.to_dir, command.n_file, command.to_basename);
}
void symlink_workload(Collector* collector, const Command& command) {
if (!create_files(command.from_dir, command.n_file, command.from_basename)) return;
if (command.drop_state) drop_state();
collector->reset();
if (symlink_files(command.from_dir, command.to_dir, command.n_file, command.from_basename,
command.to_basename))
collector->collect_metric(command.workload);
delete_files(command.to_dir, command.n_file, command.to_basename);
delete_files(command.from_dir, command.n_file, command.from_basename);
}
void readdir_workload(Collector* collector, const Command& command) {
if (!create_files(command.from_dir, command.n_file, command.from_basename)) return;
if (command.drop_state) drop_state();
collector->reset();
if (exhaustive_readdir(command.from_dir)) collector->collect_metric(command.workload);
delete_files(command.from_dir, command.n_file, command.from_basename);
}
using workload_executor_t = std::function<void(Collector*, const Command&)>;
std::unordered_map<std::string, workload_executor_t> executors = {
{Command::CREATE, create_workload}, {Command::DELETE, delete_workload},
{Command::MOVE, move_workload}, {Command::HARDLINK, hardlink_workload},
{Command::SYMLINK, symlink_workload}, {Command::READDIR, readdir_workload}};
int main(int argc, char** argv) {
std::vector<Command> commands;
Command command;
int opt;
while ((opt = getopt(argc, argv, "hvpsw:d:f:t:n:")) != -1) {
switch (opt) {
case 'h':
usage(std::cout, argv[0]);
return EXIT_SUCCESS;
case 'v':
print_version();
return EXIT_SUCCESS;
case 'p':
print_commands(commands);
return EXIT_SUCCESS;
case 's':
command.drop_state = false;
break;
case 'w':
command.workload = optarg;
commands.push_back(command);
command.reset();
break;
case 'd':
case 'f':
command.from_dir = optarg;
break;
case 't':
command.to_dir = optarg;
break;
case 'n':
command.n_file = std::stoi(optarg);
break;
default:
usage(std::cerr, argv[0]);
return EXIT_FAILURE;
}
}
Collector collector;
for (const Command& command : commands) {
auto executor = executors.find(command.workload);
if (executor == executors.end()) continue;
executor->second(&collector, command);
}
collector.report_metrics();
return EXIT_SUCCESS;
}
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