| /* |
| * Copyright (C) 2015 Apple Inc. All Rights Reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include <wtf/MemoryPressureHandler.h> |
| |
| #include <psapi.h> |
| #include <wtf/NeverDestroyed.h> |
| |
| namespace WTF { |
| |
| void MemoryPressureHandler::platformInitialize() |
| { |
| m_lowMemoryHandle = CreateMemoryResourceNotification(LowMemoryResourceNotification); |
| } |
| |
| void MemoryPressureHandler::windowsMeasurementTimerFired() |
| { |
| setMemoryPressureStatus(MemoryPressureStatus::Normal); |
| |
| BOOL memoryLow; |
| |
| if (QueryMemoryResourceNotification(m_lowMemoryHandle.get(), &memoryLow) && memoryLow) { |
| setMemoryPressureStatus(MemoryPressureStatus::SystemCritical); |
| releaseMemory(Critical::Yes); |
| return; |
| } |
| |
| #if CPU(X86) |
| PROCESS_MEMORY_COUNTERS_EX counters; |
| |
| if (!GetProcessMemoryInfo(GetCurrentProcess(), reinterpret_cast<PROCESS_MEMORY_COUNTERS*>(&counters), sizeof(counters))) |
| return; |
| |
| // On Windows, 32-bit processes have 2GB of memory available, where some is used by the system. |
| // Debugging has shown that allocations might fail and cause crashes when memory usage is > ~1GB. |
| // We should start releasing memory before we reach 1GB. |
| const int maxMemoryUsageBytes = 0.9 * 1024 * 1024 * 1024; |
| |
| if (counters.PrivateUsage > maxMemoryUsageBytes) { |
| setMemoryPressureStatus(MemoryPressureStatus::ProcessLimitCritical); |
| releaseMemory(Critical::Yes); |
| } |
| #endif |
| } |
| |
| void MemoryPressureHandler::platformReleaseMemory(Critical) |
| { |
| } |
| |
| void MemoryPressureHandler::install() |
| { |
| m_installed = true; |
| m_windowsMeasurementTimer.startRepeating(60_s); |
| } |
| |
| void MemoryPressureHandler::uninstall() |
| { |
| if (!m_installed) |
| return; |
| |
| m_windowsMeasurementTimer.stop(); |
| m_installed = false; |
| } |
| |
| void MemoryPressureHandler::holdOff(Seconds seconds) |
| { |
| } |
| |
| void MemoryPressureHandler::respondToMemoryPressure(Critical critical, Synchronous synchronous) |
| { |
| uninstall(); |
| |
| releaseMemory(critical, synchronous); |
| } |
| |
| std::optional<MemoryPressureHandler::ReliefLogger::MemoryUsage> MemoryPressureHandler::ReliefLogger::platformMemoryUsage() |
| { |
| return std::nullopt; |
| } |
| |
| } // namespace WTF |