diff --git a/kernel/src/arch/x86_64/consts.rs b/kernel/src/arch/x86_64/consts.rs
index cd44eb2..d872502 100644
--- a/kernel/src/arch/x86_64/consts.rs
+++ b/kernel/src/arch/x86_64/consts.rs
@@ -1,6 +1,6 @@
 pub const MEMORY_OFFSET: usize = 0;
 pub const KERNEL_OFFSET: usize = 0xffffff00_00000000;
-pub const KERNEL_HEAP_SIZE: usize = 32 * 1024 * 1024; // 32 MB
+pub const KERNEL_HEAP_SIZE: usize = 8 * 1024 * 1024; // 8 MB
 
 pub const USER_STACK_OFFSET: usize = 0x00008000_00000000 - USER_STACK_SIZE;
 pub const USER_STACK_SIZE: usize = 8 * 1024 * 1024; // 8 MB, the default config of Linux
diff --git a/kernel/src/arch/x86_64/memory.rs b/kernel/src/arch/x86_64/memory.rs
index cadd738..092dc9e 100644
--- a/kernel/src/arch/x86_64/memory.rs
+++ b/kernel/src/arch/x86_64/memory.rs
@@ -2,9 +2,7 @@ use crate::consts::KERNEL_OFFSET;
 use bitmap_allocator::BitAlloc;
 // Depends on kernel
 use super::{BootInfo, MemoryRegionType};
-use crate::memory::{active_table, alloc_frame, init_heap, FRAME_ALLOCATOR};
-use crate::HEAP_ALLOCATOR;
-use alloc::vec::Vec;
+use crate::memory::{active_table, init_heap, FRAME_ALLOCATOR};
 use log::*;
 use once::*;
 use rcore_memory::paging::*;
@@ -15,7 +13,6 @@ pub fn init(boot_info: &BootInfo) {
     init_frame_allocator(boot_info);
     init_device_vm_map();
     init_heap();
-    enlarge_heap();
     info!("memory: init end");
 }
 
@@ -42,30 +39,3 @@ fn init_device_vm_map() {
         .map(KERNEL_OFFSET + 0xfee00000, 0xfee00000)
         .update();
 }
-
-fn enlarge_heap() {
-    let mut page_table = active_table();
-    let mut addrs = Vec::new();
-    let va_offset = KERNEL_OFFSET + 0xe0000000;
-    for i in 0..16384 {
-        let page = alloc_frame().unwrap();
-        let va = KERNEL_OFFSET + 0xe0000000 + page;
-        if let Some((ref mut addr, ref mut len)) = addrs.last_mut() {
-            if *addr - PAGE_SIZE == va {
-                *len += PAGE_SIZE;
-                *addr -= PAGE_SIZE;
-                continue;
-            }
-        }
-        addrs.push((va, PAGE_SIZE));
-    }
-    for (addr, len) in addrs.into_iter() {
-        for va in (addr..(addr + len)).step_by(PAGE_SIZE) {
-            page_table.map(va, va - va_offset).update();
-        }
-        info!("Adding {:#X} {:#X} to heap", addr, len);
-        unsafe {
-            HEAP_ALLOCATOR.lock().init(addr, len);
-        }
-    }
-}