Index: content/browser/memory/swap_metrics_observer.cc |
diff --git a/content/browser/memory/swap_metrics_observer.cc b/content/browser/memory/swap_metrics_observer.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..d1d59b85c7bf11d451c362261f7d0c1734e8c4c3 |
--- /dev/null |
+++ b/content/browser/memory/swap_metrics_observer.cc |
@@ -0,0 +1,43 @@ |
+// Copyright 2017 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 "content/browser/memory/swap_metrics_observer.h" |
+ |
+#include "base/bind.h" |
+#include "base/threading/thread_task_runner_handle.h" |
+ |
+namespace content { |
+ |
+namespace { |
+ |
+// Time between updating swap rates. |
+const int kSwapMetricsIntervalSeconds = 60; |
+ |
+} // namespace |
+ |
+SwapMetricsObserver::SwapMetricsObserver() |
+ : update_interval_( |
+ base::TimeDelta::FromSeconds(kSwapMetricsIntervalSeconds)) {} |
+ |
+SwapMetricsObserver::~SwapMetricsObserver() {} |
+ |
+void SwapMetricsObserver::Start() { |
+ timer_.Start(FROM_HERE, update_interval_, this, |
+ &SwapMetricsObserver::UpdateMetrics); |
+} |
+ |
+void SwapMetricsObserver::Stop() { |
+ last_ticks_ = base::TimeTicks(); |
+ timer_.Stop(); |
+} |
+ |
+void SwapMetricsObserver::UpdateMetrics() { |
+ base::TimeTicks now = base::TimeTicks::Now(); |
+ base::TimeDelta interval = |
+ last_ticks_.is_null() ? base::TimeDelta() : now - last_ticks_; |
+ UpdateMetricsInternal(interval); |
+ last_ticks_ = now; |
+} |
+ |
+} // namespace content |