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/*
* Copyright (C) 2019 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 "src/profiling/perf/perf_producer.h"
#include <unistd.h>
#include <utility>
#include "perfetto/base/logging.h"
#include "perfetto/base/task_runner.h"
#include "perfetto/ext/base/weak_ptr.h"
#include "perfetto/ext/tracing/core/basic_types.h"
#include "perfetto/ext/tracing/core/producer.h"
#include "perfetto/ext/tracing/core/tracing_service.h"
#include "perfetto/ext/tracing/ipc/producer_ipc_client.h"
#include "perfetto/tracing/core/data_source_config.h"
#include "perfetto/tracing/core/data_source_descriptor.h"
#include "protos/perfetto/config/profiling/perf_event_config.pbzero.h"
#include "src/profiling/perf/event_reader.h"
namespace perfetto {
namespace profiling {
namespace {
constexpr uint32_t kInitialConnectionBackoffMs = 100;
constexpr uint32_t kMaxConnectionBackoffMs = 30 * 1000;
constexpr char kProducerName[] = "perfetto.traced_perf";
constexpr char kDataSourceName[] = "linux.perf";
} // namespace
PerfProducer::PerfProducer(base::TaskRunner* task_runner)
: task_runner_(task_runner), weak_factory_(this) {}
// TODO(rsavitski): configure at setup + enable at start, or do everything on
// start? Also, do we try to work around the old(?) cpu hotplug bugs as
// simpleperf does?
void PerfProducer::SetupDataSource(DataSourceInstanceID,
const DataSourceConfig&) {}
void PerfProducer::StartDataSource(DataSourceInstanceID instance_id,
const DataSourceConfig& config) {
PERFETTO_LOG("StartDataSource(id=%" PRIu64 ", name=%s)", instance_id,
config.name().c_str());
if (config.name() != kDataSourceName)
return;
base::Optional<EventConfig> event_config = EventConfig::Create(config);
if (!event_config.has_value()) {
PERFETTO_LOG("PerfEventConfig rejected.");
return;
}
base::Optional<EventReader> event_reader =
EventReader::ConfigureEvents(event_config.value());
if (!event_reader.has_value()) {
PERFETTO_LOG("Failed to set up perf events.");
return;
}
// Build the DataSource instance.
auto it_inserted = data_sources_.emplace(
std::piecewise_construct, std::forward_as_tuple(instance_id),
std::forward_as_tuple(std::move(event_reader.value())));
PERFETTO_DCHECK(it_inserted.second);
}
void PerfProducer::StopDataSource(DataSourceInstanceID instance_id) {
PERFETTO_LOG("StopDataSource(id=%" PRIu64 ")", instance_id);
data_sources_.erase(instance_id);
}
void PerfProducer::Flush(FlushRequestID,
const DataSourceInstanceID* data_source_ids,
size_t num_data_sources) {
for (size_t i = 0; i < num_data_sources; i++) {
PERFETTO_LOG("Flush(id=%" PRIu64 ")", data_source_ids[i]);
auto ds_it = data_sources_.find(data_source_ids[i]);
if (ds_it != data_sources_.end()) {
auto& ds = ds_it->second;
// For now, parse whatever's been accumulated in the ring buffer.
ds.event_reader.ParseNextSampleBatch();
}
}
}
void PerfProducer::ConnectWithRetries(const char* socket_name) {
PERFETTO_DCHECK(state_ == kNotStarted);
state_ = kNotConnected;
ResetConnectionBackoff();
producer_socket_name_ = socket_name;
ConnectService();
}
void PerfProducer::ConnectService() {
PERFETTO_DCHECK(state_ == kNotConnected);
state_ = kConnecting;
endpoint_ = ProducerIPCClient::Connect(producer_socket_name_, this,
kProducerName, task_runner_);
}
void PerfProducer::IncreaseConnectionBackoff() {
connection_backoff_ms_ *= 2;
if (connection_backoff_ms_ > kMaxConnectionBackoffMs)
connection_backoff_ms_ = kMaxConnectionBackoffMs;
}
void PerfProducer::ResetConnectionBackoff() {
connection_backoff_ms_ = kInitialConnectionBackoffMs;
}
void PerfProducer::OnConnect() {
PERFETTO_DCHECK(state_ == kConnecting);
state_ = kConnected;
ResetConnectionBackoff();
PERFETTO_LOG("Connected to the service");
DataSourceDescriptor desc;
desc.set_name(kDataSourceName);
endpoint_->RegisterDataSource(desc);
}
void PerfProducer::OnDisconnect() {
PERFETTO_DCHECK(state_ == kConnected || state_ == kConnecting);
PERFETTO_LOG("Disconnected from tracing service");
auto weak_producer = weak_factory_.GetWeakPtr();
if (state_ == kConnected)
return task_runner_->PostTask([weak_producer] {
if (weak_producer)
weak_producer->Restart();
});
state_ = kNotConnected;
IncreaseConnectionBackoff();
task_runner_->PostDelayedTask(
[weak_producer] {
if (weak_producer)
weak_producer->ConnectService();
},
connection_backoff_ms_);
}
void PerfProducer::Restart() {
// We lost the connection with the tracing service. At this point we need
// to reset all the data sources. Trying to handle that manually is going to
// be error prone. What we do here is simply destroy the instance and
// recreate it again.
base::TaskRunner* task_runner = task_runner_;
const char* socket_name = producer_socket_name_;
// Invoke destructor and then the constructor again.
this->~PerfProducer();
new (this) PerfProducer(task_runner);
ConnectWithRetries(socket_name);
}
} // namespace profiling
} // namespace perfetto
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