diff --git a/os/src/drivers/block/mod.rs b/os/src/drivers/block/mod.rs
index 345ba284..fbd5de9d 100644
--- a/os/src/drivers/block/mod.rs
+++ b/os/src/drivers/block/mod.rs
@@ -10,7 +10,10 @@ use crate::fs::easy_fs::BlockDevice;
 use lazy_static::*;
 
 lazy_static! {
-    pub static ref BLOCK_DEVICE: Arc<dyn BlockDevice> = Arc::new(BlockDeviceImpl::new());
+    pub static ref BLOCK_DEVICE: Arc<dyn BlockDevice> = {
+        kprintln!("[KERN] drivers::block::lazy_static!BLOCK_DEVICE begin");
+        Arc::new(BlockDeviceImpl::new())
+    };
 }
 
 #[allow(unused)]
diff --git a/os/src/drivers/block/virtio_blk.rs b/os/src/drivers/block/virtio_blk.rs
index a30e3bf8..7cd0eb87 100644
--- a/os/src/drivers/block/virtio_blk.rs
+++ b/os/src/drivers/block/virtio_blk.rs
@@ -20,7 +20,10 @@ pub struct VirtIOBlock {
 }
 
 lazy_static! {
-    static ref QUEUE_FRAMES: UPIntrFreeCell<Vec<FrameTracker>> = unsafe { UPIntrFreeCell::new(Vec::new()) };
+    static ref QUEUE_FRAMES: UPIntrFreeCell<Vec<FrameTracker>> = {
+        kprintln!("[KERN] drivers::block::virtio_blk::lazy_static!QUEUE_FRAMES begin");
+        unsafe { UPIntrFreeCell::new(Vec::new()) }
+    };
 }
 
 impl BlockDevice for VirtIOBlock {
diff --git a/os/src/drivers/chardev/mod.rs b/os/src/drivers/chardev/mod.rs
index 28665769..f12679a3 100644
--- a/os/src/drivers/chardev/mod.rs
+++ b/os/src/drivers/chardev/mod.rs
@@ -13,5 +13,8 @@ pub trait CharDevice {
 }
 
 lazy_static! {
-    pub static ref UART: Arc<CharDeviceImpl> = Arc::new(CharDeviceImpl::new());
+    pub static ref UART: Arc<CharDeviceImpl> = {
+        kprintln!("[KERN] drivers::chardev::lazy_static!UART begin");
+        Arc::new(CharDeviceImpl::new())
+    };
 }
diff --git a/os/src/fs/easy_fs/block_cache.rs b/os/src/fs/easy_fs/block_cache.rs
index 19dbac59..ac7ab5f2 100644
--- a/os/src/fs/easy_fs/block_cache.rs
+++ b/os/src/fs/easy_fs/block_cache.rs
@@ -121,8 +121,10 @@ impl BlockCacheManager {
 }
 
 lazy_static! {
-    pub static ref BLOCK_CACHE_MANAGER: Mutex<BlockCacheManager> =
-        Mutex::new(BlockCacheManager::new());
+    pub static ref BLOCK_CACHE_MANAGER: Mutex<BlockCacheManager> = {
+        kprintln!("[KERN EASYFS] block_cache::lazy_static!BLOCK_CACHE_MANAGER begin");
+        Mutex::new(BlockCacheManager::new())
+    };
 }
 
 pub fn get_block_cache(
diff --git a/os/src/fs/easy_fs/vfs.rs b/os/src/fs/easy_fs/vfs.rs
index 0b713688..1f689408 100644
--- a/os/src/fs/easy_fs/vfs.rs
+++ b/os/src/fs/easy_fs/vfs.rs
@@ -32,7 +32,7 @@ impl Inode {
     }
 
     fn read_disk_inode<V>(&self, f: impl FnOnce(&DiskInode) -> V) -> V {
-        //kprintln!("[KERN EASYFS] vfs::Inode::read_disk_inode() begin");
+        kprintln!("[KERN EASYFS] vfs::Inode::read_disk_inode() begin");
         get_block_cache(self.block_id, Arc::clone(&self.block_device))
             .lock()
             .read(self.block_offset, f)
@@ -166,7 +166,7 @@ impl Inode {
     }
 
     pub fn read_at(&self, offset: usize, buf: &mut [u8]) -> usize {
-        //kprintln!("[KERN EASYFS] vfs::Inode::read_at() begin");
+        kprintln!("[KERN EASYFS] vfs::Inode::read_at() begin");
         let _fs = self.fs.lock();
         self.read_disk_inode(|disk_inode| disk_inode.read_at(offset, buf, &self.block_device))
     }
diff --git a/os/src/fs/inode.rs b/os/src/fs/inode.rs
index eaee2f01..a3601084 100644
--- a/os/src/fs/inode.rs
+++ b/os/src/fs/inode.rs
@@ -21,6 +21,7 @@ pub struct OSInodeInner {
 
 impl OSInode {
     pub fn new(readable: bool, writable: bool, inode: Arc<Inode>) -> Self {
+        kprintln!("[KERN] fs::inode::OSInode::new() begin");
         Self {
             readable,
             writable,
@@ -28,6 +29,7 @@ impl OSInode {
         }
     }
     pub fn read_all(&self) -> Vec<u8> {
+        kprintln!("[KERN] fs::inode::OSInode::read_all() begin");
         let mut inner = self.inner.exclusive_access();
         let mut buffer = [0u8; 512];
         let mut v: Vec<u8> = Vec::new();
@@ -45,6 +47,7 @@ impl OSInode {
 
 lazy_static! {
     pub static ref ROOT_INODE: Arc<Inode> = {
+        kprintln!("[KERN] fs::inode::lazy_static!ROOT_INODE begin");
         let efs = EasyFileSystem::open(BLOCK_DEVICE.clone());
         Arc::new(EasyFileSystem::root_inode(&efs))
     };
@@ -114,7 +117,7 @@ impl File for OSInode {
         self.writable
     }
     fn read(&self, mut buf: UserBuffer) -> usize {
-        kprintln!("[KERN] fs::inode::read() begin");
+        kprintln!("[KERN] fs::inode::OSInode<FIle>::read() begin");
         let mut inner = self.inner.exclusive_access();
         let mut total_read_size = 0usize;
         for slice in buf.buffers.iter_mut() {
@@ -125,11 +128,11 @@ impl File for OSInode {
             inner.offset += read_size;
             total_read_size += read_size;
         }
-        kprintln!("[KERN] fs::inode::read() end");
+        kprintln!("[KERN] fs::inode::OSInode<FIle>::read() end");
         total_read_size
     }
     fn write(&self, buf: UserBuffer) -> usize {
-        kprintln!("[KERN] fs::inode::write() begin");
+        kprintln!("[KERN] fs::inode::OSInode<FIle>::write() begin");
         let mut inner = self.inner.exclusive_access();
         let mut total_write_size = 0usize;
         for slice in buf.buffers.iter() {
@@ -138,7 +141,7 @@ impl File for OSInode {
             inner.offset += write_size;
             total_write_size += write_size;
         }
-        kprintln!("[KERN] fs::inode::write() end");
+        kprintln!("[KERN] fs::inode::OSInode<FIle>::write() end");
         total_write_size
     }
 }
diff --git a/os/src/main.rs b/os/src/main.rs
index d64efc2a..e0c60441 100644
--- a/os/src/main.rs
+++ b/os/src/main.rs
@@ -50,7 +50,10 @@ use lazy_static::*;
 use sync::UPIntrFreeCell;
 
 lazy_static! {
-    pub static ref DEV_NON_BLOCKING_ACCESS: UPIntrFreeCell<bool> = unsafe { UPIntrFreeCell::new(false) };
+    pub static ref DEV_NON_BLOCKING_ACCESS: UPIntrFreeCell<bool> = {
+        kprintln!("[KERN] main::lazy_static!DEV_NON_BLOCKING_ACCESS begin");
+        unsafe { UPIntrFreeCell::new(false) }
+    };
 }
 
 #[no_mangle]
diff --git a/os/src/mm/frame_allocator.rs b/os/src/mm/frame_allocator.rs
index 215fd2f1..86b22d39 100644
--- a/os/src/mm/frame_allocator.rs
+++ b/os/src/mm/frame_allocator.rs
@@ -83,8 +83,10 @@ impl FrameAllocator for StackFrameAllocator {
 type FrameAllocatorImpl = StackFrameAllocator;
 
 lazy_static! {
-    pub static ref FRAME_ALLOCATOR: UPIntrFreeCell<FrameAllocatorImpl> =
-        unsafe { UPIntrFreeCell::new(FrameAllocatorImpl::new()) };
+    pub static ref FRAME_ALLOCATOR: UPIntrFreeCell<FrameAllocatorImpl> ={
+        kprintln!("[KERN] mm::frame_allocator::lazy_static!FRAME_ALLOCATOR begin");
+        unsafe { UPIntrFreeCell::new(FrameAllocatorImpl::new()) }
+    };
 }
 
 pub fn init_frame_allocator() {
diff --git a/os/src/mm/memory_set.rs b/os/src/mm/memory_set.rs
index 99726b01..11914c18 100644
--- a/os/src/mm/memory_set.rs
+++ b/os/src/mm/memory_set.rs
@@ -25,8 +25,10 @@ extern "C" {
 }
 
 lazy_static! {
-    pub static ref KERNEL_SPACE: Arc<UPIntrFreeCell<MemorySet>> =
-        Arc::new(unsafe { UPIntrFreeCell::new(MemorySet::new_kernel()) });
+    pub static ref KERNEL_SPACE: Arc<UPIntrFreeCell<MemorySet>> ={
+        kprintln!("[KERN] mm::memory_set::lazy_static!KERNEL_SPACE begin");
+        Arc::new(unsafe { UPIntrFreeCell::new(MemorySet::new_kernel()) })
+    };
 }
 
 pub fn kernel_token() -> usize {
diff --git a/os/src/sync/up.rs b/os/src/sync/up.rs
index 55c8d40a..58260956 100644
--- a/os/src/sync/up.rs
+++ b/os/src/sync/up.rs
@@ -57,6 +57,7 @@ pub struct IntrMaskingInfo {
 
 lazy_static! {
     static ref INTR_MASKING_INFO: UPSafeCellRaw<IntrMaskingInfo> = unsafe {
+        kprintln!("[KERN] sync::up::lazy_static!INTR_MASKING_INFO begin");
         UPSafeCellRaw::new(IntrMaskingInfo::new()) 
     };
 }
diff --git a/os/src/task/id.rs b/os/src/task/id.rs
index e336c500..cfb50367 100644
--- a/os/src/task/id.rs
+++ b/os/src/task/id.rs
@@ -40,10 +40,17 @@ impl RecycleAllocator {
 }
 
 lazy_static! {
-    static ref PID_ALLOCATOR: UPIntrFreeCell<RecycleAllocator> =
-        unsafe { UPIntrFreeCell::new(RecycleAllocator::new()) };
-    static ref KSTACK_ALLOCATOR: UPIntrFreeCell<RecycleAllocator> =
-        unsafe { UPIntrFreeCell::new(RecycleAllocator::new()) };
+    static ref PID_ALLOCATOR: UPIntrFreeCell<RecycleAllocator> = {
+        kprintln!("[KERN] task::id::lazy_static!PID_ALLOCATOR begin");
+        unsafe { UPIntrFreeCell::new(RecycleAllocator::new()) }
+    };
+}
+
+lazy_static! {
+    static ref KSTACK_ALLOCATOR: UPIntrFreeCell<RecycleAllocator> ={
+        kprintln!("[KERN] task::id::lazy_static!KSTACK_ALLOCATOR begin");
+        unsafe { UPIntrFreeCell::new(RecycleAllocator::new()) }
+    };
 }
 
 pub struct PidHandle(pub usize);
@@ -60,14 +67,17 @@ impl Drop for PidHandle {
 
 /// Return (bottom, top) of a kernel stack in kernel space.
 pub fn kernel_stack_position(kstack_id: usize) -> (usize, usize) {
+    kprintln!("[KERN] task::id::kernel_stack_position() begin");
     let top = TRAMPOLINE - kstack_id * (KERNEL_STACK_SIZE + PAGE_SIZE);
     let bottom = top - KERNEL_STACK_SIZE;
+    kprintln!("[KERN] task::id::kernel_stack_position() end");
     (bottom, top)
 }
 
 pub struct KernelStack(pub usize);
 
 pub fn kstack_alloc() -> KernelStack {
+    kprintln!("[KERN] task::id::kstack_alloc() begin");
     let kstack_id = KSTACK_ALLOCATOR.exclusive_access().alloc();
     let (kstack_bottom, kstack_top) = kernel_stack_position(kstack_id);
     KERNEL_SPACE.exclusive_access().insert_framed_area(
@@ -75,6 +85,7 @@ pub fn kstack_alloc() -> KernelStack {
         kstack_top.into(),
         MapPermission::R | MapPermission::W,
     );
+    kprintln!("[KERN] task::id::kstack_alloc() end");
     KernelStack(kstack_id)
 }
 
@@ -127,6 +138,7 @@ impl TaskUserRes {
         ustack_base: usize,
         alloc_user_res: bool,
     ) -> Self {
+        kprintln!("[KERN] task::id::TaskUserRes::new() begin");
         let tid = process.inner_exclusive_access().alloc_tid();
         let task_user_res = Self {
             tid,
@@ -136,13 +148,16 @@ impl TaskUserRes {
         if alloc_user_res {
             task_user_res.alloc_user_res();
         }
+        kprintln!("[KERN] task::id::TaskUserRes::new() end");
         task_user_res
     }
 
     pub fn alloc_user_res(&self) {
+        kprintln!("[KERN] task::id::TaskUserRes::alloc_user_res() begin");
         let process = self.process.upgrade().unwrap();
         let mut process_inner = process.inner_exclusive_access();
         // alloc user stack
+        kprintln!("[KERN] task::id::TaskUserRes::alloc_user_res(): alloc user stack");
         let ustack_bottom = ustack_bottom_from_tid(self.ustack_base, self.tid);
         let ustack_top = ustack_bottom + USER_STACK_SIZE;
         process_inner.memory_set.insert_framed_area(
@@ -151,6 +166,7 @@ impl TaskUserRes {
             MapPermission::R | MapPermission::W | MapPermission::U,
         );
         // alloc trap_cx
+        kprintln!("[KERN] task::id::TaskUserRes::alloc_user_res(): alloc trap_cx");
         let trap_cx_bottom = trap_cx_bottom_from_tid(self.tid);
         let trap_cx_top = trap_cx_bottom + PAGE_SIZE;
         process_inner.memory_set.insert_framed_area(
@@ -158,22 +174,29 @@ impl TaskUserRes {
             trap_cx_top.into(),
             MapPermission::R | MapPermission::W,
         );
+        kprintln!("[KERN] task::id::TaskUserRes::alloc_user_res() end");
     }
 
     fn dealloc_user_res(&self) {
+        kprintln!("[KERN] task::id::TaskUserRes::dealloc_user_res() begin");
         // dealloc tid
+        kprintln!("[KERN] task::id::TaskUserRes::dealloc_user_res():  dealloc tid");
         let process = self.process.upgrade().unwrap();
         let mut process_inner = process.inner_exclusive_access();
         // dealloc ustack manually
+        kprintln!("[KERN] task::id::TaskUserRes::dealloc_user_res():  dealloc ustack manually");
         let ustack_bottom_va: VirtAddr = ustack_bottom_from_tid(self.ustack_base, self.tid).into();
         process_inner
             .memory_set
             .remove_area_with_start_vpn(ustack_bottom_va.into());
         // dealloc trap_cx manually
+        kprintln!("[KERN] task::id::TaskUserRes::dealloc_user_res():  dealloc trap_cx  manually");
         let trap_cx_bottom_va: VirtAddr = trap_cx_bottom_from_tid(self.tid).into();
         process_inner
             .memory_set
             .remove_area_with_start_vpn(trap_cx_bottom_va.into());
+        
+        kprintln!("[KERN] task::id::TaskUserRes::dealloc_user_res() end");    
     }
 
     #[allow(unused)]
diff --git a/os/src/task/manager.rs b/os/src/task/manager.rs
index 52f2fb8f..354f1bc0 100644
--- a/os/src/task/manager.rs
+++ b/os/src/task/manager.rs
@@ -24,10 +24,17 @@ impl TaskManager {
 }
 
 lazy_static! {
-    pub static ref TASK_MANAGER: UPIntrFreeCell<TaskManager> =
-        unsafe { UPIntrFreeCell::new(TaskManager::new()) };
-    pub static ref PID2PCB: UPIntrFreeCell<BTreeMap<usize, Arc<ProcessControlBlock>>> =
-        unsafe { UPIntrFreeCell::new(BTreeMap::new()) };
+    pub static ref TASK_MANAGER: UPIntrFreeCell<TaskManager> ={
+        kprintln!("[KERN] task::manager::lazy_static!TASK_MANAGER begin");
+        unsafe { UPIntrFreeCell::new(TaskManager::new()) }
+    };
+}
+
+lazy_static! {
+    pub static ref PID2PCB: UPIntrFreeCell<BTreeMap<usize, Arc<ProcessControlBlock>>> ={
+        kprintln!("[KERN] task::manager::lazy_static!PID2PCB begin");
+        unsafe { UPIntrFreeCell::new(BTreeMap::new()) }
+    };
 }
 
 pub fn add_task(task: Arc<TaskControlBlock>) {
diff --git a/os/src/task/process.rs b/os/src/task/process.rs
index 0fe841fd..c881c59a 100644
--- a/os/src/task/process.rs
+++ b/os/src/task/process.rs
@@ -74,9 +74,12 @@ impl ProcessControlBlock {
     pub fn new(elf_data: &[u8]) -> Arc<Self> {
         // memory_set with elf program headers/trampoline/trap context/user stack
         kprintln!("[KERN] task::process::new() begin");
+        kprintln!("[KERN] task::process::new(): build MemorySet, set user_stack_base, set entry_point");
         let (memory_set, ustack_base, entry_point) = MemorySet::from_elf(elf_data);
         // allocate a pid
+        kprintln!("[KERN] task::process::new(): allocate a pid");
         let pid_handle = pid_alloc();
+        kprintln!("[KERN] task::process::new(): new ProcessControlBlockInner");
         let process = Arc::new(Self {
             pid: pid_handle,
             inner: unsafe {
@@ -104,12 +107,15 @@ impl ProcessControlBlock {
             },
         });
         // create a main thread, we should allocate ustack and trap_cx here
+        kprintln!("[KERN] task::process::new(): create a main thread begin");
+        kprintln!("[KERN] task::process::new(): create a main thread: new TCB(alloc kstack, utack & trap_cx...) ");
         let task = Arc::new(TaskControlBlock::new(
             Arc::clone(&process),
             ustack_base,
             true,
         ));
         // prepare trap_cx of main thread
+        kprintln!("[KERN] task::process::new(): create a main thread: set trap_cx(entry_point, ustack_top, k_satp, k_sp, trap_handler) ");
         let task_inner = task.inner_exclusive_access();
         let trap_cx = task_inner.get_trap_cx();
         let ustack_top = task_inner.res.as_ref().unwrap().ustack_top();
@@ -122,12 +128,15 @@ impl ProcessControlBlock {
             kstack_top,
             trap_handler as usize,
         );
+        kprintln!("[KERN] task::process::new(): create a main thread end");
         // add main thread to the process
+        kprintln!("[KERN] task::process::new(): add main thread to the process");
         let mut process_inner = process.inner_exclusive_access();
         process_inner.tasks.push(Some(Arc::clone(&task)));
         drop(process_inner);
         insert_into_pid2process(process.getpid(), Arc::clone(&process));
         // add main thread to scheduler
+        kprintln!("[KERN] task::process::new(): add_task(task): add main thread to tscheduler");
         add_task(task);
         kprintln!("[KERN] task::process::new() end");
         process
diff --git a/os/src/task/processor.rs b/os/src/task/processor.rs
index e9a88497..60c6a10e 100644
--- a/os/src/task/processor.rs
+++ b/os/src/task/processor.rs
@@ -30,7 +30,10 @@ impl Processor {
 }
 
 lazy_static! {
-    pub static ref PROCESSOR: UPIntrFreeCell<Processor> = unsafe { UPIntrFreeCell::new(Processor::new()) };
+    pub static ref PROCESSOR: UPIntrFreeCell<Processor> = {
+        kprintln!("[KERN] task::processor::lazy_static!PROCESSOR begin");
+        unsafe { UPIntrFreeCell::new(Processor::new()) }
+    };
 }
 
 pub fn run_tasks() {
diff --git a/os/src/timer.rs b/os/src/timer.rs
index ea70a90f..1702a2ff 100644
--- a/os/src/timer.rs
+++ b/os/src/timer.rs
@@ -52,8 +52,10 @@ impl Ord for TimerCondVar {
 }
 
 lazy_static! {
-    static ref TIMERS: UPIntrFreeCell<BinaryHeap<TimerCondVar>> =
-        unsafe { UPIntrFreeCell::new(BinaryHeap::<TimerCondVar>::new()) };
+    static ref TIMERS: UPIntrFreeCell<BinaryHeap<TimerCondVar>> ={
+        kprintln!("[KERN] timer::lazy_static!TIMERS begin");
+        unsafe { UPIntrFreeCell::new(BinaryHeap::<TimerCondVar>::new()) }
+    };
 }
 
 pub fn add_timer(expire_ms: usize, task: Arc<TaskControlBlock>) {