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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.
//
#define LOG_TAG "profcollectd_scheduler"
#include "scheduler.h"
#include <fstream>
#include <variant>
#include <vector>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include "compress.h"
#include "hwtrace_provider.h"
#include "json/json.h"
#include "json/writer.h"
// Default option values.
using config_t = std::pair<const char*, std::variant<const int, const char*>>;
static constexpr const config_t CONFIG_BUILD_FINGERPRINT = {"Fingerprint", "unknown"};
static constexpr const config_t CONFIG_COLLECTION_INTERVAL_SEC = {"CollectionInterval", 600};
static constexpr const config_t CONFIG_SAMPLING_PERIOD_MS = {"SamplingPeriod", 500};
static constexpr const config_t CONFIG_TRACE_OUTDIR = {"TraceDir", "/data/misc/profcollectd/trace"};
static constexpr const config_t CONFIG_PROFILE_OUTDIR = {"ProfileDir",
"/data/misc/profcollectd/output"};
static constexpr const config_t CONFIG_BINARY_FILTER = {"BinaryFilter", ""};
namespace android {
namespace profcollectd {
namespace fs = std::filesystem;
using ::android::base::GetIntProperty;
using ::android::base::GetProperty;
// Hwtrace provider registry
extern std::unique_ptr<HwtraceProvider> REGISTER_SIMPLEPERF_ETM_PROVIDER();
namespace {
void ClearDir(const fs::path& path) {
if (fs::exists(path)) {
for (const auto& entry : fs::directory_iterator(path)) {
fs::remove_all(entry);
}
}
}
bool ClearOnConfigChange(const ProfcollectdScheduler::Config& config) {
const fs::path configFile = config.profileOutputDir / "config.json";
ProfcollectdScheduler::Config oldConfig{};
// Read old config, if exists.
if (fs::exists(configFile)) {
std::ifstream ifs(configFile);
ifs >> oldConfig;
}
if (oldConfig != config) {
LOG(INFO) << "Clearing profiles due to config change.";
ClearDir(config.traceOutputDir);
ClearDir(config.profileOutputDir);
// Write new config.
std::ofstream ofs(configFile);
ofs << config;
return true;
}
return false;
}
void PeriodicCollectionWorker(std::future<void> terminationSignal, ProfcollectdScheduler& scheduler,
std::chrono::seconds& interval) {
do {
scheduler.TraceOnce();
} while ((terminationSignal.wait_for(interval)) == std::future_status::timeout);
}
} // namespace
ProfcollectdScheduler::ProfcollectdScheduler() {
ReadConfig();
// Load a registered hardware trace provider.
if ((hwtracer = REGISTER_SIMPLEPERF_ETM_PROVIDER())) {
LOG(INFO) << "ETM provider registered.";
return;
} else {
LOG(ERROR) << "No hardware trace provider found for this architecture.";
exit(EXIT_FAILURE);
}
}
OptError ProfcollectdScheduler::ReadConfig() {
if (workerThread != nullptr) {
static std::string errmsg = "Terminate the collection before refreshing config.";
return errmsg;
}
const std::lock_guard<std::mutex> lock(mu);
config.buildFingerprint = GetProperty("ro.build.fingerprint", "unknown");
config.collectionInterval = std::chrono::seconds(
GetIntProperty("profcollectd.collection_interval",
std::get<const int>(CONFIG_COLLECTION_INTERVAL_SEC.second)));
config.samplingPeriod = std::chrono::milliseconds(GetIntProperty(
"profcollectd.sampling_period_ms", std::get<const int>(CONFIG_SAMPLING_PERIOD_MS.second)));
config.traceOutputDir = GetProperty("profcollectd.trace_output_dir",
std::get<const char*>(CONFIG_TRACE_OUTDIR.second));
config.profileOutputDir =
GetProperty("profcollectd.output_dir", std::get<const char*>(CONFIG_PROFILE_OUTDIR.second));
config.binaryFilter =
GetProperty("profcollectd.binary_filter", std::get<const char*>(CONFIG_BINARY_FILTER.second));
ClearOnConfigChange(config);
return std::nullopt;
}
OptError ProfcollectdScheduler::ScheduleCollection() {
if (workerThread != nullptr) {
static std::string errmsg = "Collection is already scheduled.";
return errmsg;
}
workerThread =
std::make_unique<std::thread>(PeriodicCollectionWorker, terminate.get_future(),
std::ref(*this), std::ref(config.collectionInterval));
return std::nullopt;
}
OptError ProfcollectdScheduler::TerminateCollection() {
if (workerThread == nullptr) {
static std::string errmsg = "Collection is not scheduled.";
return errmsg;
}
terminate.set_value();
workerThread->join();
workerThread = nullptr;
terminate = std::promise<void>(); // Reset promise.
return std::nullopt;
}
OptError ProfcollectdScheduler::TraceOnce() {
const std::lock_guard<std::mutex> lock(mu);
bool success = hwtracer->Trace(config.traceOutputDir, config.samplingPeriod);
if (!success) {
static std::string errmsg = "Trace failed";
return errmsg;
}
return std::nullopt;
}
OptError ProfcollectdScheduler::ProcessProfile() {
const std::lock_guard<std::mutex> lock(mu);
hwtracer->Process(config.traceOutputDir, config.profileOutputDir, config.binaryFilter);
std::vector<fs::path> profiles;
profiles.insert(profiles.begin(), fs::directory_iterator(config.profileOutputDir),
fs::directory_iterator());
bool success = CompressFiles("/sdcard/profile.zip", profiles);
if (!success) {
static std::string errmsg = "Compress files failed";
return errmsg;
}
return std::nullopt;
}
std::ostream& operator<<(std::ostream& os, const ProfcollectdScheduler::Config& config) {
Json::Value root;
const auto writer = std::make_unique<Json::StyledStreamWriter>();
root[CONFIG_BUILD_FINGERPRINT.first] = config.buildFingerprint;
root[CONFIG_COLLECTION_INTERVAL_SEC.first] = config.collectionInterval.count();
root[CONFIG_SAMPLING_PERIOD_MS.first] = config.samplingPeriod.count();
root[CONFIG_TRACE_OUTDIR.first] = config.traceOutputDir.c_str();
root[CONFIG_PROFILE_OUTDIR.first] = config.profileOutputDir.c_str();
root[CONFIG_BINARY_FILTER.first] = config.binaryFilter.c_str();
writer->write(os, root);
return os;
}
std::istream& operator>>(std::istream& is, ProfcollectdScheduler::Config& config) {
Json::Value root;
const auto reader = std::make_unique<Json::Reader>();
bool success = reader->parse(is, root);
if (!success) {
return is;
}
config.buildFingerprint = root[CONFIG_BUILD_FINGERPRINT.first].asString();
config.collectionInterval =
std::chrono::seconds(root[CONFIG_COLLECTION_INTERVAL_SEC.first].asInt64());
config.samplingPeriod =
std::chrono::duration<float>(root[CONFIG_SAMPLING_PERIOD_MS.first].asFloat());
config.traceOutputDir = root[CONFIG_TRACE_OUTDIR.first].asString();
config.profileOutputDir = root[CONFIG_PROFILE_OUTDIR.first].asString();
config.binaryFilter = root[CONFIG_BINARY_FILTER.first].asString();
return is;
}
} // namespace profcollectd
} // namespace android
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