blob: 0ae6d477f4a8adfcace10716d1d94202c81e19b6 [file] [log] [blame]
// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/metrics/child_call_stack_profile_collector.h"
#include <utility>
#include "base/bind.h"
#include "base/logging.h"
#include "base/synchronization/lock.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/time/time.h"
namespace metrics {
ChildCallStackProfileCollector::ProfileState::ProfileState() = default;
ChildCallStackProfileCollector::ProfileState::ProfileState(ProfileState&&) =
default;
ChildCallStackProfileCollector::ProfileState::ProfileState(
base::TimeTicks start_timestamp,
SampledProfile profile)
: start_timestamp(start_timestamp), profile(std::move(profile)) {}
ChildCallStackProfileCollector::ProfileState::~ProfileState() = default;
// Some versions of GCC need this for push_back to work with std::move.
ChildCallStackProfileCollector::ProfileState&
ChildCallStackProfileCollector::ProfileState::operator=(ProfileState&&) =
default;
ChildCallStackProfileCollector::ChildCallStackProfileCollector() {}
ChildCallStackProfileCollector::~ChildCallStackProfileCollector() {}
void ChildCallStackProfileCollector::SetParentProfileCollector(
metrics::mojom::CallStackProfileCollectorPtr parent_collector) {
base::AutoLock alock(lock_);
// This function should only invoked once, during the mode of operation when
// retaining profiles after construction.
DCHECK(retain_profiles_);
retain_profiles_ = false;
task_runner_ = base::ThreadTaskRunnerHandle::Get();
// This should only be set one time per child process.
DCHECK(!parent_collector_);
parent_collector_ = std::move(parent_collector);
if (parent_collector_) {
for (ProfileState& state : profiles_) {
parent_collector_->Collect(state.start_timestamp,
std::move(state.profile));
}
}
profiles_.clear();
}
void ChildCallStackProfileCollector::Collect(base::TimeTicks start_timestamp,
SampledProfile profile) {
base::AutoLock alock(lock_);
if (task_runner_ &&
// The profiler thread does not have a task runner. Attempting to
// invoke Get() on it results in a DCHECK.
(!base::ThreadTaskRunnerHandle::IsSet() ||
base::ThreadTaskRunnerHandle::Get() != task_runner_)) {
// Post back to the thread that owns the the parent interface.
task_runner_->PostTask(
FROM_HERE, base::BindOnce(&ChildCallStackProfileCollector::Collect,
// This class has lazy instance lifetime.
base::Unretained(this), start_timestamp,
std::move(profile)));
return;
}
if (parent_collector_) {
parent_collector_->Collect(start_timestamp, std::move(profile));
} else if (retain_profiles_) {
profiles_.push_back(ProfileState(start_timestamp, std::move(profile)));
}
}
} // namespace metrics