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// Copyright 2024 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/passage_embeddings/cpu_histogram_logger.h"
#include <memory>
#include <utility>
#include "base/check_op.h"
#include "base/metrics/histogram_functions.h"
#include "base/scoped_observation.h"
#include "base/time/time.h"
#include "components/performance_manager/public/resource_attribution/cpu_proportion_tracker.h"
#include "components/performance_manager/public/resource_attribution/process_context.h"
#include "components/performance_manager/public/resource_attribution/queries.h"
#include "components/performance_manager/public/resource_attribution/query_results.h"
#include "content/public/browser/browser_child_process_host.h"
namespace {
constexpr base::TimeDelta kSampleInterval = base::Seconds(30);
constexpr int kCpuUsageFactor = 100 * 100;
constexpr int kCpuUsageMin = 1;
constexpr int kCpuUsageMax = 400 * kCpuUsageFactor;
constexpr int kBucketCount = 100;
} // namespace
namespace passage_embeddings {
class CpuHistogramLogger::CpuObserver
: public resource_attribution::QueryResultObserver {
public:
CpuObserver(const resource_attribution::ProcessContext& context,
base::RepeatingCallback<bool()> poll_embedder_running);
~CpuObserver() override;
CpuObserver(const CpuObserver&) = delete;
CpuObserver& operator=(const CpuObserver&) = delete;
void MakeSelfOwned(std::unique_ptr<CpuObserver> self);
// QueryResultObserver:
void OnResourceUsageUpdated(
const resource_attribution::QueryResultMap& results) override;
private:
resource_attribution::ScopedResourceUsageQuery scoped_query_;
resource_attribution::ScopedQueryObservation query_observation_{this};
resource_attribution::CPUProportionTracker proportion_tracker_;
bool proportion_tracker_started_ = false;
base::RepeatingCallback<bool()> poll_embedder_running_;
bool embedder_was_running_ = false;
std::unique_ptr<CpuObserver> self_;
};
CpuHistogramLogger::CpuObserver::CpuObserver(
const resource_attribution::ProcessContext& context,
base::RepeatingCallback<bool()> poll_embedder_running)
: scoped_query_(
resource_attribution::QueryBuilder()
.AddResourceType(resource_attribution::ResourceType::kCPUTime)
.AddResourceContext(context)
.CreateScopedQuery()),
poll_embedder_running_(poll_embedder_running) {
query_observation_.Observe(&scoped_query_);
scoped_query_.Start(kSampleInterval);
// Take an immediate baseline measurement for proportion tracker.
scoped_query_.QueryOnce();
}
CpuHistogramLogger::CpuObserver::~CpuObserver() = default;
void CpuHistogramLogger::CpuObserver::MakeSelfOwned(
std::unique_ptr<CpuObserver> self) {
CHECK_EQ(self.get(), this);
CHECK(!self_);
self_ = std::move(self);
}
void CpuHistogramLogger::CpuObserver::OnResourceUsageUpdated(
const resource_attribution::QueryResultMap& results) {
// If MakeSelfOwned() was called, delete `this` on function exit.
std::unique_ptr<CpuObserver> to_delete = std::move(self_);
if (results.size() == 0) {
// Service process couldn't be measured.
return;
}
CHECK_EQ(results.size(), 1ul);
if (!proportion_tracker_started_) {
proportion_tracker_.StartFirstInterval(base::TimeTicks::Now(), results);
proportion_tracker_started_ = true;
} else {
std::map<resource_attribution::ResourceContext, double> cpu_proportion =
proportion_tracker_.StartNextInterval(base::TimeTicks::Now(), results);
if (cpu_proportion.size() == 0) {
// When the service process exits close to the measurement time, the
// proportion tracker might skip the final measurement due to a race.
return;
}
CHECK_EQ(cpu_proportion.size(), 1ul);
int sample = cpu_proportion.begin()->second * kCpuUsageFactor;
base::UmaHistogramCustomCounts("History.Embeddings.Embedder.CpuUsage2",
sample, kCpuUsageMin, kCpuUsageMax,
kBucketCount);
if (!to_delete) {
const bool embedder_is_running = poll_embedder_running_.Run();
if (!embedder_was_running_ && !embedder_is_running) {
base::UmaHistogramCustomCounts(
"History.Embeddings.Embedder.CpuUsage2.NotRunning", sample,
kCpuUsageMin, kCpuUsageMax, kBucketCount);
} else if (embedder_was_running_ && embedder_is_running) {
base::UmaHistogramCustomCounts(
"History.Embeddings.Embedder.CpuUsage2.Running", sample,
kCpuUsageMin, kCpuUsageMax, kBucketCount);
} else {
base::UmaHistogramCustomCounts(
"History.Embeddings.Embedder.CpuUsage2.RunningPartial", sample,
kCpuUsageMin, kCpuUsageMax, kBucketCount);
}
embedder_was_running_ = embedder_is_running;
}
}
}
CpuHistogramLogger::CpuHistogramLogger() = default;
CpuHistogramLogger::~CpuHistogramLogger() {
StopLoggingAfterNextUpdate();
CHECK(!cpu_observer_);
}
void CpuHistogramLogger::StartLogging(
content::BrowserChildProcessHost* utility_process_host,
base::RepeatingCallback<bool()> poll_embedder_running) {
CHECK(!cpu_observer_);
auto process_context =
resource_attribution::ProcessContext::FromBrowserChildProcessHost(
utility_process_host);
if (process_context.has_value()) {
cpu_observer_ = std::make_unique<CpuObserver>(process_context.value(),
poll_embedder_running);
}
}
void CpuHistogramLogger::StopLoggingAfterNextUpdate() {
// The observer will finish the current interval and then delete itself.
CpuObserver* observer = cpu_observer_.get();
if (observer) {
observer->MakeSelfOwned(std::move(cpu_observer_));
}
}
} // namespace passage_embeddings
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