Enforce aggressive GC for Linux

madvdontneed.go

@@ -0,0 +1,47 @@
+// +build linux
+
+package main
+
+import (
+	"log"
+	"os"
+	"runtime/debug"
+	"strings"
+	"syscall"
+	"time"
+)
+
+// Inject madvdontneed=1 as soon as possible.
+
+var _ = func() struct{} {
+	// If GODEBUG is not empty, then use that instead of trying to exec our own.
+	if os.Getenv("GODEBUG") != "" {
+		return struct{}{}
+	}
+
+	// Do magic.
+	var environ = append(os.Environ(), "GODEBUG=madvdontneed=1")
+
+	log.Println("execve(2)ing with madvdontneed=1 for aggressive GC.")
+
+	if err := syscall.Exec(os.Args[0], os.Args, environ); err != nil {
+		log.Fatalln("Fatal error while executing:", err)
+	} else {
+		os.Exit(0)
+	}
+
+	return struct{}{}
+}()
+
+func init() {
+	// Aggressive memory freeing you asked, so aggressive memory freeing we will
+	// deliver.
+	if strings.Contains(os.Getenv("GODEBUG"), "madvdontneed=1") {
+		go func() {
+			log.Println("Now attempting to free memory every 5s... (madvdontneed=1)")
+			for range time.Tick(5 * time.Second) {
+				debug.FreeOSMemory()
+			}
+		}()
+	}
+}

main.go

@@ -1,11 +1,6 @@
 package main
 
 import (
-	"os"
-	"runtime/debug"
-	"strings"
-	"time"
-
 	"github.com/diamondburned/cchat-gtk/internal/gts"
 	"github.com/diamondburned/cchat-gtk/internal/log"
 	"github.com/diamondburned/cchat-gtk/internal/ui"
@@ -19,19 +14,6 @@ import (
 // destructor is used for debugging and profiling.
 var destructor = func() {}
 
-func init() {
-	// Aggressive memory freeing you asked, so aggressive memory freeing we will
-	// deliver.
-	if strings.Contains(os.Getenv("GODEBUG"), "madvdontneed=1") {
-		go func() {
-			log.Println("Now attempting to free memory every 5s... (madvdontneed=1)")
-			for range time.Tick(5 * time.Second) {
-				debug.FreeOSMemory()
-			}
-		}()
-	}
-}
-
 func main() {
 	gts.Main(func() gts.MainApplication {
 		var app = ui.NewApplication()