| // Copyright (c) 2016 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/memory_monitor_linux.h" |
| |
| #include "base/memory/ptr_util.h" |
| #include "base/process/process_metrics.h" |
| |
| namespace content { |
| |
| namespace { |
| |
| // The number of bits to shift to convert KiB to MiB. |
| const int kShiftKiBtoMiB = 10; |
| |
| } // namespace |
| |
| MemoryMonitorLinux::MemoryMonitorLinux(MemoryMonitorDelegate* delegate) |
| : delegate_(delegate) {} |
| |
| MemoryMonitorLinux::~MemoryMonitorLinux() {} |
| |
| int MemoryMonitorLinux::GetFreeMemoryUntilCriticalMB() { |
| base::SystemMemoryInfoKB mem_info = {}; |
| delegate_->GetSystemMemoryInfo(&mem_info); |
| |
| // According to kernel commit 34e431b0ae398fc54ea69ff85ec700722c9da773, |
| // "available" is the "amount of memory that is available for a new workload |
| // without pushing the system into swap"; return that value if it is valid. |
| // Old linux kernels (before 3.14) don't support "available" and show zero |
| // instead. |
| if (mem_info.available > 0) |
| return mem_info.available >> kShiftKiBtoMiB; |
| |
| // If there is no "available" value, guess at it based on free memory. |
| // Though there will be easily discardable memory (buffers and caches), we |
| // don't count them because discarding them will affect the overall |
| // performance of the OS. |
| return mem_info.free >> kShiftKiBtoMiB; |
| } |
| |
| // static |
| std::unique_ptr<MemoryMonitorLinux> MemoryMonitorLinux::Create( |
| MemoryMonitorDelegate* delegate) { |
| return std::make_unique<MemoryMonitorLinux>(delegate); |
| } |
| |
| // Implementation of factory function defined in memory_monitor.h. |
| std::unique_ptr<MemoryMonitor> CreateMemoryMonitor() { |
| return MemoryMonitorLinux::Create(MemoryMonitorDelegate::GetInstance()); |
| } |
| |
| } // namespace content |