athena/resource_manager/delegate/resource_manager_delegate.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "athena/resource_manager/public/resource_manager_delegate.h"
   6
   7 #include <string>
   8
   9 #include "base/logging.h"
  10 #include "base/macros.h"
  11 #include "base/process/process_metrics.h"
  12
  13 namespace athena {
  14
  15 namespace {
  16 // This is the minimum amount of time in milliseconds between checks for
  17 // memory pressure.
  18 const int kMemoryPressureIntervalMs = 750;
  19 }  // namespace
  20
  21 class ResourceManagerDelegateImpl : public ResourceManagerDelegate {
  22  public:
  23   ResourceManagerDelegateImpl() {}
  24   virtual ~ResourceManagerDelegateImpl() {}
  25
  26  private:
  27   virtual int GetUsedMemoryInPercent() OVERRIDE {
  28     base::SystemMemoryInfoKB memory;
  29     // TODO(skuhne): According to semenzato this calculation has to change.
  30     if (base::GetSystemMemoryInfo(&memory) &&
  31         memory.total > 0 && memory.free >= 0) {
  32       return ((memory.total - memory.free) * 100) / memory.total;
  33     }
  34     LOG(WARNING) << "Cannot determine the free memory of the system.";
  35     return 0;
  36   }
  37
  38   virtual int MemoryPressureIntervalInMS() OVERRIDE {
  39     return kMemoryPressureIntervalMs;
  40   }
  41   DISALLOW_COPY_AND_ASSIGN(ResourceManagerDelegateImpl);
  42 };
  43
  44 // static
  45 ResourceManagerDelegate*
  46 ResourceManagerDelegate::CreateResourceManagerDelegate() {
  47   return new ResourceManagerDelegateImpl;
  48 }
  49
  50 }  // namespace athena