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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/metrics/perf/perf_output.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/task/thread_pool.h"
#include "chromeos/ash/components/dbus/debug_daemon/debug_daemon_client.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "dbus/object_path.h"
#include "dbus/object_proxy.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
namespace metrics {
PerfOutputCall::PerfOutputCall(ash::DebugDaemonClient* debug_daemon_client,
const std::vector<std::string>& quipper_args,
bool disable_cpu_idle,
DoneCallback callback)
: debug_daemon_client_(debug_daemon_client),
quipper_args_(quipper_args),
disable_cpu_idle_(disable_cpu_idle),
done_callback_(std::move(callback)),
pending_stop_(false) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
perf_data_pipe_reader_ =
std::make_unique<chromeos::PipeReader>(base::ThreadPool::CreateTaskRunner(
{base::MayBlock(), base::TaskPriority::USER_VISIBLE,
base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN}));
base::ScopedFD pipe_write_end =
perf_data_pipe_reader_->StartIO(base::BindOnce(
&PerfOutputCall::OnIOComplete, weak_factory_.GetWeakPtr()));
DCHECK(debug_daemon_client_);
debug_daemon_client_->GetPerfOutput(
quipper_args_, disable_cpu_idle_, pipe_write_end.get(),
base::BindOnce(&PerfOutputCall::OnGetPerfOutput,
weak_factory_.GetWeakPtr()));
}
PerfOutputCall::PerfOutputCall()
: debug_daemon_client_(nullptr),
pending_stop_(false),
weak_factory_(this) {}
PerfOutputCall::~PerfOutputCall() = default;
void PerfOutputCall::Stop() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!perf_session_id_) {
// GetPerfOutputFd hasn't returned the session ID yet. Mark that Stop() has
// been called. StopImpl() will be delayed until we receive the session ID.
pending_stop_ = true;
return;
}
StopImpl();
}
void PerfOutputCall::OnIOComplete(std::optional<std::string> result) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
perf_data_pipe_reader_.reset();
// Use the r-value variant of std::optional::value_or() to move |result| to
// the callback argument. Callback can safely use |result| after |this| is
// deleted.
std::move(done_callback_).Run(std::move(result).value_or(std::string()));
// NOTE: |this| may be deleted at this point!
}
void PerfOutputCall::OnGetPerfOutput(std::optional<uint64_t> result) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// Signal pipe reader to shut down.
if (!result.has_value() && perf_data_pipe_reader_.get()) {
perf_data_pipe_reader_.reset();
std::move(done_callback_).Run(std::string());
// NOTE: |this| may be deleted at this point!
return;
}
// DBus method GetPerfOutputFd returns a generated session ID back to the
// caller. The session ID will be used in stopping the existing perf session.
perf_session_id_ = result;
if (pending_stop_) {
// Stop() is called before GetPerfOutputFd returns the session ID. We can
// invoke the StopPerf DBus method now.
StopImpl();
}
}
void PerfOutputCall::StopImpl() {
DCHECK(perf_session_id_);
debug_daemon_client_->StopPerf(*perf_session_id_, base::DoNothing());
}
} // namespace metrics
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