diff --git a/kernel/Makefile b/kernel/Makefile
index d21f3f5..cdd9e0d 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -33,8 +33,8 @@
 
 arch ?= riscv64
 board ?= none
-mode ?= debug
-LOG  ?= debug
+mode ?= release
+LOG  ?=
 graphic ?= off
 smp  ?= 4
 pci_passthru ?=
diff --git a/kernel/events b/kernel/events
deleted file mode 100644
index d99bc24..0000000
--- a/kernel/events
+++ /dev/null
@@ -1,62 +0,0 @@
-virtqueue_pop
-virtio_blk_req_complete
-virtio_blk_rw_complete
-virtio_blk_submit_multireq
-virtio_blk_handle_write
-virtio_blk_handle_read
-e1000e_link_status
-e1000e_mac_set_sw
-e1000e_irq_itr_set
-e1000e_irq_eitr_set
-e1000e_tx_disabled
-e1000e_tx_descr
-e1000e_rx_descr
-#e1000e_rx_has_buffers
-e1000e_rx_start_recv
-#e1000e_rx_can_recv
-e1000e_rx_can_recv_rings_full
-e1000_receiver_overrun
-#e1000e_rx_receive_iov
-e1000e_core_ctrl_sw_reset
-e1000e_core_ctrl_phy_reset
-e1000e_rx_desc_buff_sizes
-e1000e_rx_set_rctl
-e1000e_rx_desc_len
-e1000e_core_ctrl_write
-e1000e_link_status_changed
-e1000e_rx_rss_dispatched_to_queue
-e1000e_rx_desc_buff_write
-e1000e_rx_null_descriptor
-e1000e_rx_set_rdt
-e1000e_msix_use_vector_fail
-e1000e_msix_init_fail
-e1000e_msi_init_fail
-e1000e_cb_pci_uninit
-e1000e_cfg_support_virtio
-e1000e_irq_msi_notify_postponed
-e1000e_irq_msix_notify_postponed_vec
-e1000e_irq_throttling_no_pending_vec
-e1000e_irq_msix_notify_vec
-e1000e_wrn_msix_vec_wrong
-e1000e_wrn_msix_invalid
-e1000e_irq_iam_clear_eiame
-e1000e_irq_icr_clear_eiac
-e1000e_irq_msi_notify
-pci_update_mappings_del
-pci_update_mappings_add
-e1000e_irq_icr_write
-e1000e_irq_icr_read_entry
-e1000e_irq_legacy_notify
-e1000e_irq_add_msi_other
-e1000e_irq_pending_interrupts
-e1000e_irq_icr_write
-e1000e_irq_msix_notify_vec
-e1000e_wrn_msix_vec_wrong
-e1000e_wrn_msix_invalid
-e1000e_irq_iam_clear_eiame
-e1000e_irq_icr_clear_eiac
-e1000e_irq_postponed_by_xitr
-e1000e_intrmgr_rearm_timer
-msix_*
-#ahci_*
-ide_*
\ No newline at end of file
diff --git a/kernel/src/logging.rs b/kernel/src/logging.rs
index b832d50..838abe5 100644
--- a/kernel/src/logging.rs
+++ b/kernel/src/logging.rs
@@ -14,13 +14,12 @@ pub fn init() {
     static LOGGER: SimpleLogger = SimpleLogger;
     log::set_logger(&LOGGER).unwrap();
     log::set_max_level(match option_env!("LOG") {
-        Some("off") => LevelFilter::Off,
         Some("error") => LevelFilter::Error,
         Some("warn") => LevelFilter::Warn,
         Some("info") => LevelFilter::Info,
         Some("debug") => LevelFilter::Debug,
         Some("trace") => LevelFilter::Trace,
-        _ => LevelFilter::Warn,
+        _ => LevelFilter::Off,
     });
 }
 
diff --git a/kernel/src/shell.rs b/kernel/src/shell.rs
index fe8dc61..000ad63 100644
--- a/kernel/src/shell.rs
+++ b/kernel/src/shell.rs
@@ -8,12 +8,12 @@ use alloc::vec::Vec;
 
 #[cfg(not(feature = "run_cmdline"))]
 pub fn run_user_shell() {
-    if let Ok(inode) = ROOT_INODE.lookup("rust/sh") {
+    if let Ok(inode) = ROOT_INODE.lookup("busybox") {
         let data = inode.read_as_vec().unwrap();
         processor().manager().add(Thread::new_user(
             data.as_slice(),
-            "rust/sh",
-            vec!["sh".into()],
+            "busybox",
+            vec!["busybox".into(), "sh".into()],
             Vec::new(),
         ));
     } else {
diff --git a/kernel/src/syscall/fs.rs b/kernel/src/syscall/fs.rs
index 4ad87e7..d9f843a 100644
--- a/kernel/src/syscall/fs.rs
+++ b/kernel/src/syscall/fs.rs
@@ -80,11 +80,14 @@ pub fn sys_ppoll(ufds: *mut PollFd, nfds: usize, timeout: *const TimeSpec) -> Sy
 }
 
 pub fn sys_poll(ufds: *mut PollFd, nfds: usize, timeout_msecs: usize) -> SysResult {
-    info!(
-        "poll: ufds: {:?}, nfds: {}, timeout_msecs: {:#x}",
-        ufds, nfds, timeout_msecs
-    );
     let proc = process();
+    if !proc.pid.is_init() {
+        // we trust pid 0 process
+        info!(
+            "poll: ufds: {:?}, nfds: {}, timeout_msecs: {:#x}",
+            ufds, nfds, timeout_msecs
+        );
+    }
     proc.vm.check_write_array(ufds, nfds)?;
 
     let polls = unsafe { slice::from_raw_parts_mut(ufds, nfds) };
@@ -222,11 +225,14 @@ pub fn sys_readv(fd: usize, iov_ptr: *const IoVec, iov_count: usize) -> SysResul
 }
 
 pub fn sys_writev(fd: usize, iov_ptr: *const IoVec, iov_count: usize) -> SysResult {
-    info!(
-        "writev: fd: {}, iov: {:?}, count: {}",
-        fd, iov_ptr, iov_count
-    );
     let mut proc = process();
+    if !proc.pid.is_init() {
+        // we trust pid 0 process
+        info!(
+            "writev: fd: {}, iov: {:?}, count: {}",
+            fd, iov_ptr, iov_count
+        );
+    }
     let iovs = IoVecs::check_and_new(iov_ptr, iov_count, &proc.vm, false)?;
 
     let buf = iovs.read_all_to_vec();
@@ -297,7 +303,7 @@ pub fn sys_faccessat(dirfd: usize, path: *const u8, mode: usize, flags: usize) -
         // we trust pid 0 process
         info!(
             "faccessat: dirfd: {}, path: {:?}, mode: {:#o}, flags: {:?}",
-            dirfd, path, mode, flags
+            dirfd as isize, path, mode, flags
         );
     }
     let inode = proc.lookup_inode_at(dirfd, &path)?;
@@ -342,7 +348,7 @@ pub fn sys_fstatat(dirfd: usize, path: *const u8, stat_ptr: *mut Stat, flags: us
     let flags = AtFlags::from_bits_truncate(flags);
     info!(
         "fstatat: dirfd: {}, path: {:?}, stat_ptr: {:?}, flags: {:?}",
-        dirfd, path, stat_ptr, flags
+        dirfd as isize, path, stat_ptr, flags
     );
 
     let inode = proc.lookup_inode_at(dirfd, &path)?;
@@ -525,7 +531,7 @@ pub fn sys_renameat(
     let newpath = unsafe { proc.vm.check_and_clone_cstr(newpath)? };
     info!(
         "renameat: olddirfd: {}, oldpath: {:?}, newdirfd: {}, newpath: {:?}",
-        olddirfd, oldpath, newdirfd, newpath
+        olddirfd as isize, oldpath, newdirfd as isize, newpath
     );
 
     let (old_dir_path, old_file_name) = split_path(&oldpath);
@@ -546,7 +552,7 @@ pub fn sys_mkdirat(dirfd: usize, path: *const u8, mode: usize) -> SysResult {
     // TODO: check pathname
     info!(
         "mkdirat: dirfd: {}, path: {:?}, mode: {:#o}",
-        dirfd, path, mode
+        dirfd as isize, path, mode
     );
 
     let (dir_path, file_name) = split_path(&path);
@@ -590,7 +596,7 @@ pub fn sys_linkat(
     let flags = AtFlags::from_bits_truncate(flags);
     info!(
         "linkat: olddirfd: {}, oldpath: {:?}, newdirfd: {}, newpath: {:?}, flags: {:?}",
-        olddirfd, oldpath, newdirfd, newpath, flags
+        olddirfd as isize, oldpath, newdirfd as isize, newpath, flags
     );
 
     let (new_dir_path, new_file_name) = split_path(&newpath);
@@ -610,7 +616,7 @@ pub fn sys_unlinkat(dirfd: usize, path: *const u8, flags: usize) -> SysResult {
     let flags = AtFlags::from_bits_truncate(flags);
     info!(
         "unlinkat: dirfd: {}, path: {:?}, flags: {:?}",
-        dirfd, path, flags
+        dirfd as isize, path, flags
     );
 
     let (dir_path, file_name) = split_path(&path);
@@ -765,8 +771,8 @@ impl Process {
     ) -> Result<Arc<INode>, SysError> {
         let follow = true;
         debug!(
-            "lookup_inode_at: fd: {:?}, cwd: {:?}, path: {:?}, follow: {:?}",
-            dirfd, self.cwd, path, follow
+            "lookup_inode_at: dirfd: {:?}, cwd: {:?}, path: {:?}, follow: {:?}",
+            dirfd as isize, self.cwd, path, follow
         );
         let follow_max_depth = if follow { FOLLOW_MAX_DEPTH } else { 0 };
         if dirfd == AT_FDCWD {
diff --git a/kernel/src/syscall/proc.rs b/kernel/src/syscall/proc.rs
index 9f3c97c..362aef0 100644
--- a/kernel/src/syscall/proc.rs
+++ b/kernel/src/syscall/proc.rs
@@ -124,7 +124,7 @@ pub fn sys_exec(
     envp: *const *const u8,
     tf: &mut TrapFrame,
 ) -> SysResult {
-    info!("exec: name: {:?}, argv: {:?} envp: {:?}", name, argv, envp);
+    info!("exec: name: {:?}, argv: {:?}, envp: {:?}", name, argv, envp);
     let proc = process();
     let exec_name = if name.is_null() {
         String::from("")
@@ -165,7 +165,7 @@ pub fn sys_exec(
     }
 
     info!(
-        "EXEC: name:{:?} , args {:?}, envp {:?}",
+        "exec: name: {:?}, args: {:?}, envp: {:?}",
         exec_name, args, envs
     );