Consolidate code monitoring low memory kills and OOM kills to MemoryKillsMonitor on ChromeOS.

chrome/browser/memory/tab_manager_delegate_chromeos.cc

 // Copyright 2015 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 "chrome/browser/memory/tab_manager_delegate_chromeos.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <map>
 #include <string>
 #include <vector>
 
 #include "ash/shell.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/memory/memory_pressure_monitor_chromeos.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/process/process_handle.h"  // kNullProcessHandle.
 #include "base/process/process_metrics.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "chrome/browser/chromeos/arc/process/arc_process.h"
 #include "chrome/browser/chromeos/arc/process/arc_process_service.h"
+#include "chrome/browser/memory/memory_kills_monitor.h"
 #include "chrome/browser/memory/tab_stats.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_features.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "components/arc/arc_bridge_service.h"
 #include "components/arc/common/process.mojom.h"
-#include "components/arc/metrics/oom_kills_histogram.h"
 #include "components/exo/shell_surface.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/zygote_host_linux.h"
 #include "ui/aura/window.h"
 #include "ui/wm/public/activation_client.h"
 
@@ skipping 216 matching lines @@
 
 int TabManagerDelegate::MemoryStat::EstimatedMemoryFreedKB(
     base::ProcessHandle pid) {
   std::unique_ptr<base::ProcessMetrics> process_metrics(
       base::ProcessMetrics::CreateProcessMetrics(pid));
   base::WorkingSetKBytes mem_usage;
   process_metrics->GetWorkingSetKBytes(&mem_usage);
   return mem_usage.priv;
 }
 
-class TabManagerDelegate::UmaReporter {
- public:
-  UmaReporter() : total_kills_(0) {}
-  ~UmaReporter() {}
-
-  void ReportKill(const int memory_freed);
-
- private:
-  base::Time last_kill_time_;
-  int total_kills_;
-};
-
-void TabManagerDelegate::UmaReporter::ReportKill(const int memory_freed) {
-  base::Time now = base::Time::Now();
-  const TimeDelta time_delta =
-      last_kill_time_.is_null() ?
-      TimeDelta::FromSeconds(arc::kMaxOomMemoryKillTimeDeltaSecs) :
-      (now - last_kill_time_);
-  UMA_HISTOGRAM_OOM_KILL_TIME_INTERVAL(
-            "Arc.LowMemoryKiller.TimeDelta", time_delta);
-  last_kill_time_ = now;
-
-  ++total_kills_;
-  UMA_HISTOGRAM_CUSTOM_COUNTS(
-      "Arc.LowMemoryKiller.Count", total_kills_, 1, 1000, 1001);
-
-  UMA_HISTOGRAM_MEMORY_KB("Arc.LowMemoryKiller.FreedSize",
-                          memory_freed);
-}
-
 TabManagerDelegate::TabManagerDelegate(
     const base::WeakPtr<TabManager>& tab_manager)
   : TabManagerDelegate(tab_manager, new MemoryStat()) {
 }
 
 TabManagerDelegate::TabManagerDelegate(
     const base::WeakPtr<TabManager>& tab_manager,
     TabManagerDelegate::MemoryStat* mem_stat)
     : tab_manager_(tab_manager),
       focused_process_(new FocusedProcess()),
       mem_stat_(mem_stat),
-      uma_(new UmaReporter()),
       weak_ptr_factory_(this) {
   registrar_.Add(this, content::NOTIFICATION_RENDERER_PROCESS_CLOSED,
                  content::NotificationService::AllBrowserContextsAndSources());
   registrar_.Add(this, content::NOTIFICATION_RENDERER_PROCESS_TERMINATED,
                  content::NotificationService::AllBrowserContextsAndSources());
   registrar_.Add(this, content::NOTIFICATION_RENDER_WIDGET_VISIBILITY_CHANGED,
                  content::NotificationService::AllBrowserContextsAndSources());
   auto* activation_client = GetActivationClient();
   if (activation_client)
     activation_client->AddObserver(this);
@@ skipping 296 matching lines @@
         process_type == ProcessType::FOCUSED_APP ||
         process_type == ProcessType::FOCUSED_TAB) {
       VLOG(2) << "Skipped killing " << *it;
       continue;
     }
     if (it->app()) {
       int estimated_memory_freed_kb =
           mem_stat_->EstimatedMemoryFreedKB(it->app()->pid());
       if (KillArcProcess(it->app()->nspid())) {
         target_memory_to_free_kb -= estimated_memory_freed_kb;
-        uma_->ReportKill(estimated_memory_freed_kb);
+        MemoryKillsMonitor::LogLowMemoryKill("APP", estimated_memory_freed_kb);
         VLOG(2) << "Killed " << *it;
       }
     } else {
       int64_t tab_id = it->tab()->tab_contents_id;
       // The estimation is problematic since multiple tabs may share the same
       // process, while the calculation counts memory used by the whole process.
       // So |estimated_memory_freed_kb| is an over-estimation.
       int estimated_memory_freed_kb =
           mem_stat_->EstimatedMemoryFreedKB(it->tab()->renderer_handle);
       if (KillTab(tab_id)) {
         target_memory_to_free_kb -= estimated_memory_freed_kb;
-        uma_->ReportKill(estimated_memory_freed_kb);
+        MemoryKillsMonitor::LogLowMemoryKill("TAB", estimated_memory_freed_kb);
         VLOG(2) << "Killed " << *it;
       }
     }
     if (target_memory_to_free_kb < 0)
       break;
   }
 }
 
 void TabManagerDelegate::AdjustOomPrioritiesImpl(
     const TabStatsList& tab_list,
@@ skipping 90 matching lines @@
     }
     priority += priority_increment;
   }
 
   if (oom_scores_to_change.size())
     GetDebugDaemonClient()->SetOomScoreAdj(
         oom_scores_to_change, base::Bind(&OnSetOomScoreAdj));
 }
 
 }  // namespace memory