NOISSUE count swaptotal in total ram (linux)

launcher/Application.cpp

@@ -658,6 +658,7 @@ Application::Application(int &argc, char **argv) : QApplication(argc, argv)
         m_settings->registerSetting({"MinMemAlloc", "MinMemoryAlloc"}, 512);
         m_settings->registerSetting({"MaxMemAlloc", "MaxMemoryAlloc"}, 1024);
         m_settings->registerSetting("PermGen", 128);
+        m_settings->registerSetting("AllowSwap", false);
 
         // Java Settings
         m_settings->registerSetting("JavaPath", "");

launcher/ui/pages/global/JavaPage.cpp

@@ -37,9 +37,13 @@ JavaPage::JavaPage(QWidget *parent) : QWidget(parent), ui(new Ui::JavaPage)
     ui->setupUi(this);
     ui->tabWidget->tabBar()->hide();
 
-    auto sysMiB = Sys::getSystemRam() / Sys::mebibyte;
-    ui->maxMemSpinBox->setMaximum(sysMiB);
+#if !defined(Q_OS_LINUX)
+    ui->allowSwapCheckBox->setEnabled(false);
+    ui->allowSwapCheckBox->setVisible(false);
+#endif
+
     loadSettings();
+    updateMemMax();
 }
 
 JavaPage::~JavaPage()
@@ -71,6 +75,7 @@ void JavaPage::applySettings()
         s->set("MaxMemAlloc", min);
     }
     s->set("PermGen", ui->permGenSpinBox->value());
+    s->set("AllowSwap", ui->allowSwapCheckBox->isChecked());
 
     // Java Settings
     s->set("JavaPath", ui->javaPathTextBox->text());
@@ -94,12 +99,27 @@ void JavaPage::loadSettings()
         ui->maxMemSpinBox->setValue(min);
     }
     ui->permGenSpinBox->setValue(s->get("PermGen").toInt());
+    ui->allowSwapCheckBox->setChecked(s->get("AllowSwap").toBool());
 
     // Java Settings
     ui->javaPathTextBox->setText(s->get("JavaPath").toString());
     ui->jvmArgsTextBox->setText(s->get("JvmArgs").toString());
 }
 
+void JavaPage::updateMemMax() {
+    auto sysMiB = Sys::getSystemRam() / Sys::mebibyte;
+
+    if (ui->allowSwapCheckBox->isChecked())
+        sysMiB += Sys::getSystemSwap() / Sys::mebibyte;
+
+    ui->maxMemSpinBox->setMaximum(sysMiB);
+}
+
+void JavaPage::on_allowSwapCheckBox_clicked(bool checked)
+{
+    updateMemMax();
+}
+
 void JavaPage::on_javaDetectBtn_clicked()
 {
     JavaInstallPtr java;

launcher/ui/pages/global/JavaPage.h

@@ -58,9 +58,11 @@ class JavaPage : public QWidget, public BasePage
 private:
     void applySettings();
     void loadSettings();
+    void updateMemMax();
 
 private
 slots:
+    void on_allowSwapCheckBox_clicked(bool clicked);
     void on_javaDetectBtn_clicked();
     void on_javaTestBtn_clicked();
     void on_javaBrowseBtn_clicked();

launcher/ui/pages/global/JavaPage.ui

@@ -132,6 +132,16 @@
             </property>
            </widget>
           </item>
+          <item row="3" column="0">
+           <widget class="QCheckBox" name="allowSwapCheckBox">
+            <property name="text">
+             <string>Allow use of swap</string>
+            </property>
+            <property name="toolTip">
+             <string>Allows the usage of swap when specifying memory allocation.</string>
+            </property>
+           </widget>
+          </item>
          </layout>
         </widget>
        </item>

libraries/systeminfo/include/sys.h

@@ -57,6 +57,8 @@ DistributionInfo getDistributionInfo();
 
 uint64_t getSystemRam();
 
+uint64_t getSystemSwap();
+
 bool isSystem64bit();
 
 bool isCPU64bit();

libraries/systeminfo/src/sys_apple.cpp

@@ -55,6 +55,11 @@ uint64_t Sys::getSystemRam()
     }
 }
 
+uint64_t Sys::getSystemSwap()
+{
+    return 0;
+}
+
 bool Sys::isCPU64bit()
 {
     // not even going to pretend I'm going to support anything else

libraries/systeminfo/src/sys_unix.cpp

@@ -82,6 +82,31 @@ uint64_t Sys::getSystemRam()
     return 0; // nothing found
 }
 
+uint64_t Sys::getSystemSwap()
+{
+    std::string token;
+#ifdef Q_OS_LINUX
+    std::ifstream file("/proc/meminfo");
+    while(file >> token)
+    {
+        if(token == "SwapTotal:")
+        {
+            uint64_t swap;
+            if(file >> swap)
+            {
+                return swap * 1024ull;
+            }
+            else
+            {
+                return 0;
+            }
+        }
+        file.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
+    }
+#endif
+    return 0;
+}
+
 bool Sys::isCPU64bit()
 {
     return isSystem64bit();

libraries/systeminfo/src/sys_win32.cpp

@@ -27,6 +27,11 @@ uint64_t Sys::getSystemRam()
     return (uint64_t)status.ullTotalPhys;
 }
 
+uint64_t Sys::getSystemSwap()
+{
+    return 0;
+}
+
 bool Sys::isSystem64bit()
 {
 #if defined(_WIN64)