Delete athena/

athena/resource_manager/delegate/resource_manager_delegate.cc

-// Copyright 2014 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 "athena/resource_manager/public/resource_manager_delegate.h"
-
-#include <string>
-
-#include "base/logging.h"
-#include "base/macros.h"
-#include "base/process/process_metrics.h"
-
-namespace athena {
-
-namespace {
-// This is the minimum amount of time in milliseconds between checks for
-// memory pressure.
-const int kMemoryPressureIntervalMs = 750;
-}  // namespace
-
-class ResourceManagerDelegateImpl : public ResourceManagerDelegate {
- public:
-  ResourceManagerDelegateImpl() {}
-  ~ResourceManagerDelegateImpl() override {}
-
- private:
-  int GetUsedMemoryInPercent() override {
-    base::SystemMemoryInfoKB info;
-    if (!base::GetSystemMemoryInfo(&info)) {
-      LOG(WARNING) << "Cannot determine the free memory of the system.";
-      return 0;
-    }
-    // TODO(skuhne): Instead of adding the kernel memory pressure calculation
-    // logic here, we should have a kernel mechanism similar to the low memory
-    // notifier in ChromeOS which offers multiple pressure states.
-    // To track this, we have crbug.com/381196.
-
-    // The available memory consists of "real" and virtual (z)ram memory.
-    // Since swappable memory uses a non pre-deterministic compression and
-    // the compression creates its own "dynamic" in the system, it gets
-    // de-emphasized by the |kSwapWeight| factor.
-    const int kSwapWeight = 4;
-
-    // The total memory we have is the "real memory" plus the virtual (z)ram.
-    int total_memory = info.total + info.swap_total / kSwapWeight;
-
-    // The kernel internally uses 50MB.
-    const int kMinFileMemory = 50 * 1024;
-
-    // Most file memory can be easily reclaimed.
-    int file_memory = info.active_file + info.inactive_file;
-    // unless it is dirty or it's a minimal portion which is required.
-    file_memory -= info.dirty + kMinFileMemory;
-
-    // Available memory is the sum of free, swap and easy reclaimable memory.
-    int available_memory =
-        info.free + info.swap_free / kSwapWeight + file_memory;
-
-    DCHECK(available_memory < total_memory);
-    int percentage = ((total_memory - available_memory) * 100) / total_memory;
-    return percentage;
-  }
-
-  int MemoryPressureIntervalInMS() override {
-    return kMemoryPressureIntervalMs;
-  }
-  DISALLOW_COPY_AND_ASSIGN(ResourceManagerDelegateImpl);
-};
-
-// static
-ResourceManagerDelegate*
-ResourceManagerDelegate::CreateResourceManagerDelegate() {
-  return new ResourceManagerDelegateImpl;
-}
-
-}  // namespace athena