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// 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
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