Increase heap size

arch/x86_64/src/lib.rs

@@ -37,7 +37,7 @@ pub extern crate x86;
     /// Offset to kernel heap
     pub const KERNEL_HEAP_OFFSET: usize = KERNEL_OFFSET + PML4_SIZE/2;
     /// Size of kernel heap
-    pub const KERNEL_HEAP_SIZE: usize = 64 * 1024 * 1024; // 64 MB
+    pub const KERNEL_HEAP_SIZE: usize = 256 * 1024 * 1024; // 256 MB
 
     /// Offset to kernel percpu variables
     //TODO: Use 64-bit fs offset to enable this pub const KERNEL_PERCPU_OFFSET: usize = KERNEL_HEAP_OFFSET - PML4_SIZE;