chromium/content/browser/renderer_host/recently_destroyed_hosts.cc

// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/renderer_host/recently_destroyed_hosts.h"

#include "base/memory/ptr_util.h"
#include "base/metrics/histogram_macros.h"
#include "base/time/time.h"
#include "content/browser/child_process_security_policy_impl.h"
#include "content/browser/process_lock.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/render_process_host.h"

namespace content {

namespace {

// Maintains a list of recently destroyed processes to gather metrics on the
// potential for process reuse (crbug.com/894253).
const void* const kRecentlyDestroyedHostTrackerKey = …;
// Sentinel value indicating that no recently destroyed process matches the
// host currently seeking a process. Changing this invalidates the histogram.
constexpr base::TimeDelta kRecentlyDestroyedNotFoundSentinel = …;

void RecordMetric(base::TimeDelta value) { … }

}  // namespace

constexpr base::TimeDelta
    RecentlyDestroyedHosts::kRecentlyDestroyedStorageTimeout;

RecentlyDestroyedHosts::~RecentlyDestroyedHosts() = default;

// static
void RecentlyDestroyedHosts::RecordMetricIfReusableHostRecentlyDestroyed(
    const base::TimeTicks& reusable_host_lookup_time,
    const ProcessLock& process_lock,
    BrowserContext* browser_context) { … }

// static
void RecentlyDestroyedHosts::Add(
    RenderProcessHost* host,
    const base::TimeDelta& time_spent_running_unload_handlers,
    BrowserContext* browser_context) { … }

RecentlyDestroyedHosts::RecentlyDestroyedHosts() = default;

RecentlyDestroyedHosts* RecentlyDestroyedHosts::GetInstance(
    BrowserContext* browser_context) { … }

void RecentlyDestroyedHosts::RemoveExpiredEntries() { … }

void RecentlyDestroyedHosts::AddReuseInterval(const base::TimeDelta& interval) { … }

}  // namespace content