Allow to set "working set limit" on non-Windows OS

PR #16874.

src/app/application.cpp

@@ -39,6 +39,8 @@
 #include <memory>
 #include <Windows.h>
 #include <Shellapi.h>
+#elif defined(Q_OS_UNIX)
+#include <sys/resource.h>
 #endif
 
 #include <QAtomicInt>
@@ -127,9 +129,7 @@ Application::Application(int &argc, char **argv)
     , m_storeFileLoggerAge(FILELOGGER_SETTINGS_KEY(u"Age"_qs))
     , m_storeFileLoggerAgeType(FILELOGGER_SETTINGS_KEY(u"AgeType"_qs))
     , m_storeFileLoggerPath(FILELOGGER_SETTINGS_KEY(u"Path"_qs))
-#ifdef Q_OS_WIN
     , m_storeMemoryWorkingSetLimit(SETTINGS_KEY(u"MemoryWorkingSetLimit"_qs))
-#endif
 {
     qRegisterMetaType<Log::Msg>("Log::Msg");
     qRegisterMetaType<Log::Peer>("Log::Peer");
@@ -206,7 +206,6 @@ const QBtCommandLineParameters &Application::commandLineArgs() const
     return m_commandLineArgs;
 }
 
-#ifdef Q_OS_WIN
 int Application::memoryWorkingSetLimit() const
 {
     return m_storeMemoryWorkingSetLimit.get(512);
@@ -220,7 +219,6 @@ void Application::setMemoryWorkingSetLimit(const int size)
     m_storeMemoryWorkingSetLimit = size;
     applyMemoryWorkingSetLimit();
 }
-#endif
 
 bool Application::isFileLoggerEnabled() const
 {
@@ -598,9 +596,7 @@ void Application::processParams(const QStringList &params)
 
 int Application::exec(const QStringList &params)
 {
-#ifdef Q_OS_WIN
     applyMemoryWorkingSetLimit();
-#endif
 
     Net::ProxyConfigurationManager::initInstance();
     Net::DownloadManager::initInstance();
@@ -771,28 +767,43 @@ void Application::shutdownCleanup(QSessionManager &manager)
 }
 #endif
 
-#ifdef Q_OS_WIN
 void Application::applyMemoryWorkingSetLimit()
 {
-    const SIZE_T UNIT_SIZE = 1024 * 1024; // MiB
-    const SIZE_T maxSize = memoryWorkingSetLimit() * UNIT_SIZE;
-    const SIZE_T minSize = std::min<SIZE_T>((64 * UNIT_SIZE), (maxSize / 2));
+    const size_t MiB = 1024 * 1024;
+    const QString logMessage = tr("Failed to set physical memory (RAM) usage limit. Error code: %1. Error message: \"%2\"");
+
+#ifdef Q_OS_WIN
+    const SIZE_T maxSize = memoryWorkingSetLimit() * MiB;
+    const SIZE_T minSize = std::min((64 * MiB), (maxSize / 2));
     if (!::SetProcessWorkingSetSizeEx(::GetCurrentProcess(), minSize, maxSize, QUOTA_LIMITS_HARDWS_MAX_ENABLE))
     {
         const DWORD errorCode = ::GetLastError();
         QString message;
         LPVOID lpMsgBuf = nullptr;
-        if (::FormatMessageW((FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS)
-                         , nullptr, errorCode, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), reinterpret_cast<LPWSTR>(&lpMsgBuf), 0, nullptr))
+        const DWORD msgLength = ::FormatMessageW((FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS)
+            , nullptr, errorCode, LANG_USER_DEFAULT, reinterpret_cast<LPWSTR>(&lpMsgBuf), 0, nullptr);
+        if (msgLength > 0)
         {
             message = QString::fromWCharArray(reinterpret_cast<LPWSTR>(lpMsgBuf)).trimmed();
             ::LocalFree(lpMsgBuf);
         }
-        LogMsg(tr("Failed to set physical memory (RAM) usage limit. Error code: %1. Error message: \"%2\"")
-               .arg(QString::number(errorCode), message), Log::WARNING);
+        LogMsg(logMessage.arg(QString::number(errorCode), message), Log::WARNING);
+    }
+#elif defined(Q_OS_UNIX)
+    // has no effect on linux but it might be meaningful for other OS
+    rlimit limit {};
+
+    if (::getrlimit(RLIMIT_RSS, &limit) != 0)
+        return;
+
+    limit.rlim_cur = memoryWorkingSetLimit() * MiB;
+    if (::setrlimit(RLIMIT_RSS, &limit) != 0)
+    {
+        const auto message = QString::fromLocal8Bit(strerror(errno));
+        LogMsg(logMessage.arg(QString::number(errno), message), Log::WARNING);
     }
-}
 #endif
+}
 
 void Application::cleanup()
 {

src/app/application.h

@@ -113,10 +113,8 @@ public:
     int fileLoggerAgeType() const override;
     void setFileLoggerAgeType(int value) override;
 
-#ifdef Q_OS_WIN
     int memoryWorkingSetLimit() const override;
     void setMemoryWorkingSetLimit(int size) override;
-#endif
 
 #ifndef DISABLE_GUI
     QPointer<MainWindow> mainWindow() override;
@@ -137,9 +135,7 @@ private:
     void processParams(const QStringList &params);
     void runExternalProgram(const BitTorrent::Torrent *torrent) const;
     void sendNotificationEmail(const BitTorrent::Torrent *torrent);
-#ifdef Q_OS_WIN
     void applyMemoryWorkingSetLimit();
-#endif
 
 #ifndef DISABLE_GUI
 #ifdef Q_OS_MACOS
@@ -166,9 +162,7 @@ private:
     SettingValue<int> m_storeFileLoggerAge;
     SettingValue<int> m_storeFileLoggerAgeType;
     SettingValue<Path> m_storeFileLoggerPath;
-#ifdef Q_OS_WIN
     SettingValue<int> m_storeMemoryWorkingSetLimit;
-#endif
 
 #ifndef DISABLE_GUI
     QPointer<MainWindow> m_window;

src/base/interfaces/iapplication.h

@@ -30,8 +30,6 @@
 
 #pragma once
 
-#include <QtGlobal>
-
 class QString;
 
 class Path;
@@ -58,8 +56,6 @@ public:
     virtual int fileLoggerAgeType() const = 0;
     virtual void setFileLoggerAgeType(int value) = 0;
 
-#ifdef Q_OS_WIN
     virtual int memoryWorkingSetLimit() const = 0;
     virtual void setMemoryWorkingSetLimit(int size) = 0;
-#endif
 };

src/gui/advancedsettings.cpp

@@ -62,9 +62,9 @@ namespace
         // qBittorrent section
         QBITTORRENT_HEADER,
         RESUME_DATA_STORAGE,
+        MEMORY_WORKING_SET_LIMIT,
 #if defined(Q_OS_WIN)
         OS_MEMORY_PRIORITY,
-        MEMORY_WORKING_SET_LIMIT,
 #endif
         // network interface
         NETWORK_IFACE,
@@ -177,6 +177,8 @@ void AdvancedSettings::saveAdvancedSettings()
                                       ? BitTorrent::ResumeDataStorageType::Legacy
                                       : BitTorrent::ResumeDataStorageType::SQLite);
 
+    // Physical memory (RAM) usage limit
+    dynamic_cast<IApplication *>(QCoreApplication::instance())->setMemoryWorkingSetLimit(m_spinBoxMemoryWorkingSetLimit.value());
 #if defined(Q_OS_WIN)
     BitTorrent::OSMemoryPriority prio = BitTorrent::OSMemoryPriority::Normal;
     switch (m_comboBoxOSMemoryPriority.currentIndex())
@@ -199,8 +201,6 @@ void AdvancedSettings::saveAdvancedSettings()
         break;
     }
     session->setOSMemoryPriority(prio);
-
-    dynamic_cast<IApplication *>(QCoreApplication::instance())->setMemoryWorkingSetLimit(m_spinBoxMemoryWorkingSetLimit.value());
 #endif
     // Async IO threads
     session->setAsyncIOThreads(m_spinBoxAsyncIOThreads.value());
@@ -419,6 +419,14 @@ void AdvancedSettings::loadAdvancedSettings()
     m_comboBoxResumeDataStorage.setCurrentIndex((session->resumeDataStorageType() == BitTorrent::ResumeDataStorageType::Legacy) ? 0 : 1);
     addRow(RESUME_DATA_STORAGE, tr("Resume data storage type (requires restart)"), &m_comboBoxResumeDataStorage);
 
+    // Physical memory (RAM) usage limit
+    m_spinBoxMemoryWorkingSetLimit.setMinimum(1);
+    m_spinBoxMemoryWorkingSetLimit.setMaximum(std::numeric_limits<int>::max());
+    m_spinBoxMemoryWorkingSetLimit.setSuffix(tr(" MiB"));
+    m_spinBoxMemoryWorkingSetLimit.setToolTip(tr("This option is less effective on Linux"));
+    m_spinBoxMemoryWorkingSetLimit.setValue(dynamic_cast<IApplication *>(QCoreApplication::instance())->memoryWorkingSetLimit());
+    addRow(MEMORY_WORKING_SET_LIMIT, (tr("Physical memory (RAM) usage limit") + u' ' + makeLink(u"https://wikipedia.org/wiki/Working_set", u"(?)"))
+        , &m_spinBoxMemoryWorkingSetLimit);
 #if defined(Q_OS_WIN)
     m_comboBoxOSMemoryPriority.addItems({tr("Normal"), tr("Below normal"), tr("Medium"), tr("Low"), tr("Very low")});
     int OSMemoryPriorityIndex = 0;
@@ -445,17 +453,7 @@ void AdvancedSettings::loadAdvancedSettings()
     addRow(OS_MEMORY_PRIORITY, (tr("Process memory priority (Windows >= 8 only)")
         + u' ' + makeLink(u"https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/ns-processthreadsapi-memory_priority_information", u"(?)"))
         , &m_comboBoxOSMemoryPriority);
-
-    m_spinBoxMemoryWorkingSetLimit.setMinimum(1);
-    m_spinBoxMemoryWorkingSetLimit.setMaximum(std::numeric_limits<int>::max());
-    m_spinBoxMemoryWorkingSetLimit.setSuffix(tr(" MiB"));
-    m_spinBoxMemoryWorkingSetLimit.setValue(dynamic_cast<IApplication *>(QCoreApplication::instance())->memoryWorkingSetLimit());
-
-    addRow(MEMORY_WORKING_SET_LIMIT, (tr("Physical memory (RAM) usage limit")
-        + u' ' + makeLink(u"https://wikipedia.org/wiki/Working_set", u"(?)"))
-        , &m_spinBoxMemoryWorkingSetLimit);
 #endif
-
     // Async IO threads
     m_spinBoxAsyncIOThreads.setMinimum(1);
     m_spinBoxAsyncIOThreads.setMaximum(1024);

src/gui/advancedsettings.h

@@ -58,7 +58,7 @@ private:
     void loadAdvancedSettings();
     template <typename T> void addRow(int row, const QString &text, T *widget);
 
-    QSpinBox m_spinBoxAsyncIOThreads, m_spinBoxFilePoolSize, m_spinBoxCheckingMemUsage, m_spinBoxDiskQueueSize,
+    QSpinBox m_spinBoxMemoryWorkingSetLimit, m_spinBoxAsyncIOThreads, m_spinBoxFilePoolSize, m_spinBoxCheckingMemUsage, m_spinBoxDiskQueueSize,
              m_spinBoxSaveResumeDataInterval, m_spinBoxOutgoingPortsMin, m_spinBoxOutgoingPortsMax, m_spinBoxUPnPLeaseDuration, m_spinBoxPeerToS,
              m_spinBoxListRefresh, m_spinBoxTrackerPort, m_spinBoxSendBufferWatermark, m_spinBoxSendBufferLowWatermark,
              m_spinBoxSendBufferWatermarkFactor, m_spinBoxConnectionSpeed, m_spinBoxSocketBacklogSize, m_spinBoxMaxConcurrentHTTPAnnounces, m_spinBoxStopTrackerTimeout,
@@ -82,7 +82,6 @@ private:
     // OS dependent settings
 #if defined(Q_OS_WIN)
     QComboBox m_comboBoxOSMemoryPriority;
-    QSpinBox m_spinBoxMemoryWorkingSetLimit;
 #endif
 
 #ifndef Q_OS_MACOS

src/webui/api/appcontroller.cpp

@@ -45,6 +45,7 @@
 
 #include "base/bittorrent/session.h"
 #include "base/global.h"
+#include "base/interfaces/iapplication.h"
 #include "base/net/portforwarder.h"
 #include "base/net/proxyconfigurationmanager.h"
 #include "base/path.h"
@@ -285,6 +286,8 @@ void AppController::preferencesAction()
 
     // Advanced settings
     // qBitorrent preferences
+    // Physical memory (RAM) usage limit
+    data[u"memory_working_set_limit"_qs] = dynamic_cast<IApplication *>(QCoreApplication::instance())->memoryWorkingSetLimit();
     // Current network interface
     data[u"current_network_interface"_qs] = session->networkInterface();
     // Current network interface address
@@ -738,6 +741,9 @@ void AppController::setPreferencesAction()
 
     // Advanced settings
     // qBittorrent preferences
+    // Physical memory (RAM) usage limit
+    if (hasKey(u"memory_working_set_limit"_qs))
+        dynamic_cast<IApplication *>(QCoreApplication::instance())->setMemoryWorkingSetLimit(it.value().toInt());
     // Current network interface
     if (hasKey(u"current_network_interface"_qs))
     {

src/webui/webapplication.h

@@ -48,7 +48,7 @@
 #include "base/utils/version.h"
 #include "api/isessionmanager.h"
 
-inline const Utils::Version<int, 3, 2> API_VERSION {2, 8, 9};
+inline const Utils::Version<int, 3, 2> API_VERSION {2, 8, 10};
 
 class APIController;
 class AuthController;

src/webui/www/private/views/preferences.html

@@ -903,6 +903,14 @@
     <fieldset class="settings">
         <legend>QBT_TR(qBittorrent Section)QBT_TR[CONTEXT=OptionsDialog]&nbsp;(<a href="https://github.com/qbittorrent/qBittorrent/wiki/Explanation-of-Options-in-qBittorrent#Advanced" target="_blank">QBT_TR(Open documentation)QBT_TR[CONTEXT=HttpServer]</a>)</legend>
         <table>
+            <tr>
+                <td>
+                    <label for="memoryWorkingSetLimit">QBT_TR(Physical memory (RAM) usage limit:)QBT_TR[CONTEXT=OptionsDialog]&nbsp;<a href="https://wikipedia.org/wiki/Working_set" target="_blank">(?)</a></label>
+                </td>
+                <td>
+                    <input type="text" id="memoryWorkingSetLimit" style="width: 15em;" title="QBT_TR(This option is less effective on Linux)QBT_TR[CONTEXT=OptionsDialog]">&nbsp;&nbsp;QBT_TR(MiB)QBT_TR[CONTEXT=OptionsDialog]
+                </td>
+            </tr>
             <tr>
                 <td>
                     <label for="networkInterface">QBT_TR(Network interface:)QBT_TR[CONTEXT=OptionsDialog]</label>
@@ -1947,6 +1955,7 @@
 
                         // Advanced settings
                         // qBittorrent section
+                        $('memoryWorkingSetLimit').setProperty('value', pref.memory_working_set_limit);
                         updateNetworkInterfaces(pref.current_network_interface);
                         updateInterfaceAddresses(pref.current_network_interface, pref.current_interface_address);
                         $('saveResumeDataInterval').setProperty('value', pref.save_resume_data_interval);
@@ -2346,6 +2355,7 @@
 
             // Update advanced settings
             // qBittorrent section
+            settings.set('memory_working_set_limit', $('memoryWorkingSetLimit').getProperty('value'));
             settings.set('current_network_interface', $('networkInterface').getProperty('value'));
             settings.set('current_interface_address', $('optionalIPAddressToBind').getProperty('value'));
             settings.set('save_resume_data_interval', $('saveResumeDataInterval').getProperty('value'));