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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 "components/metrics/call_stacks/child_call_stack_profile_collector.h"
#include <utility>
#include "base/check.h"
#include "base/functional/bind.h"
#include "base/synchronization/lock.h"
#include "base/task/single_thread_task_runner.h"
#include "base/time/time.h"
#include "mojo/public/cpp/base/proto_wrapper.h"
#include "third_party/metrics_proto/sampled_profile.pb.h"
namespace metrics {
ChildCallStackProfileCollector::ProfileState::ProfileState() = default;
ChildCallStackProfileCollector::ProfileState::ProfileState(ProfileState&&) =
default;
ChildCallStackProfileCollector::ProfileState::ProfileState(
base::TimeTicks start_timestamp,
mojom::ProfileType profile_type,
mojom::SampledProfilePtr profile)
: start_timestamp(start_timestamp),
profile_type(profile_type),
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() = default;
ChildCallStackProfileCollector::~ChildCallStackProfileCollector() = default;
void ChildCallStackProfileCollector::SetParentProfileCollector(
mojo::PendingRemote<metrics::mojom::CallStackProfileCollector>
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::SingleThreadTaskRunner::GetCurrentDefault();
// This should only be set one time per child process.
DCHECK(!parent_collector_);
// If |parent_collector| is mojo::NullRemote(), it skips Bind since
// mojo::Remote doesn't allow Bind with mojo::NullRemote().
if (parent_collector) {
parent_collector_.Bind(std::move(parent_collector));
if (parent_collector_) {
for (ProfileState& state : profiles_) {
parent_collector_->Collect(state.start_timestamp, state.profile_type,
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::SingleThreadTaskRunner::HasCurrentDefault() ||
base::SingleThreadTaskRunner::GetCurrentDefault() != 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_ && !retain_profiles_) {
// Nothing to do.
return;
}
mojom::SampledProfilePtr mojo_profile = mojom::SampledProfile::New();
mojo_profile->contents = mojo_base::ProtoWrapper(profile);
const mojom::ProfileType profile_type =
profile.trigger_event() == SampledProfile::PERIODIC_HEAP_COLLECTION
? mojom::ProfileType::kHeap
: mojom::ProfileType::kCPU;
if (parent_collector_) {
parent_collector_->Collect(start_timestamp, profile_type,
std::move(mojo_profile));
return;
}
if (retain_profiles_) {
profiles_.emplace_back(start_timestamp, profile_type,
std::move(mojo_profile));
}
}
} // namespace metrics
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