update runtime info

os/src/mm/frame_allocator.rs

@@ -28,7 +28,9 @@ impl Debug for FrameTracker {
 
 impl Drop for FrameTracker {
     fn drop(&mut self) {
+        kprintln!("[KERN] mm::frame_allocator::Drop<FrameTracker>::drop begin");
         frame_dealloc(self.ppn);
+        kprintln!("[KERN] mm::frame_allocator::Drop<FrameTracker>::drop end");
     }
 }
 

os/src/syscall/process.rs

@@ -96,14 +96,17 @@ pub fn sys_waitpid(pid: isize, exit_code_ptr: *mut i32) -> isize {
         // ++++ release child PCB
     });
     if let Some((idx, _)) = pair {
+        kprintln!("[KERN] syscall::process::sys_waitpid(): remove child from PCB's children Vector");
         let child = inner.children.remove(idx);
         // confirm that child will be deallocated after being removed from children list
         assert_eq!(Arc::strong_count(&child), 1);
         let found_pid = child.getpid();
         // ++++ temporarily access child PCB exclusively
+        kprintln!("[KERN] syscall::process::sys_waitpid(): get child's exit_code and return child pid");
         let exit_code = child.inner_exclusive_access().exit_code;
         // ++++ release child PCB
         *translated_refmut(inner.memory_set.token(), exit_code_ptr) = exit_code;
+        kprintln!("[KERN] syscall::process::sys_waitpid(): release child PCB");
         found_pid as isize
     } else {
         -2

os/src/task/id.rs

@@ -61,7 +61,9 @@ pub fn pid_alloc() -> PidHandle {
 
 impl Drop for PidHandle {
     fn drop(&mut self) {
+        kprintln!("[KERN] task::id::Drop<PidHandle>::drop begin");
         PID_ALLOCATOR.exclusive_access().dealloc(self.0);
+        kprintln!("[KERN] task::id::Drop<PidHandle>::drop end");
     }
 }
 
@@ -91,11 +93,13 @@ pub fn kstack_alloc() -> KernelStack {
 
 impl Drop for KernelStack {
     fn drop(&mut self) {
+        kprintln!("[KERN] task::id::Drop<KernelStack>::drop begin");
         let (kernel_stack_bottom, _) = kernel_stack_position(self.0);
         let kernel_stack_bottom_va: VirtAddr = kernel_stack_bottom.into();
         KERNEL_SPACE
             .exclusive_access()
             .remove_area_with_start_vpn(kernel_stack_bottom_va.into());
+        kprintln!("[KERN] task::id::Drop<KernelStack>::drop end");    
     }
 }
 
@@ -240,7 +244,9 @@ impl TaskUserRes {
 
 impl Drop for TaskUserRes {
     fn drop(&mut self) {
+        kprintln!("[KERN] task::id::Drop<TaskUserRes>::drop begin");
         self.dealloc_tid();
         self.dealloc_user_res();
+        kprintln!("[KERN] task::id::Drop<TaskUserRes>::drop end");
     }
 }

os/src/task/mod.rs

@@ -67,24 +67,32 @@ pub fn exit_current_and_run_next(exit_code: i32) {
     let process = task.process.upgrade().unwrap();
     let tid = task_inner.res.as_ref().unwrap().tid;
     // record exit code
+    kprintln!("[KERN] task::exit_current_and_run_next(): record exit code in task_inner");
     task_inner.exit_code = Some(exit_code);
+    kprintln!("[KERN] task::exit_current_and_run_next(): TaskUserRes =>None");
     task_inner.res = None;
     // here we do not remove the thread since we are still using the kstack
     // it will be deallocated when sys_waittid is called
+    kprintln!("[KERN] task::exit_current_and_run_next(): drop task_inner");
     drop(task_inner);
+    kprintln!("[KERN] task::exit_current_and_run_next(): drop task");
     drop(task);
     // however, if this is the main thread of current process
     // the process should terminate at once
     if tid == 0 {
+        kprintln!("[KERN] task::exit_current_and_run_next(): it's main thread, process should terminate at once");
         remove_from_pid2process(process.getpid());
         let mut process_inner = process.inner_exclusive_access();
         // mark this process as a zombie process
+        kprintln!("[KERN] task::exit_current_and_run_next(): mark this process as a zombie process");
         process_inner.is_zombie = true;
         // record exit code of main process
+        kprintln!("[KERN] task::exit_current_and_run_next(): record exit code in process_inner");
         process_inner.exit_code = exit_code;
 
         {
             // move all child processes under init process
+            kprintln!("[KERN] task::exit_current_and_run_next(): move all child processes under INITPROC");
             let mut initproc_inner = INITPROC.inner_exclusive_access();
             for child in process_inner.children.iter() {
                 child.inner_exclusive_access().parent = Some(Arc::downgrade(&INITPROC));
@@ -95,22 +103,26 @@ pub fn exit_current_and_run_next(exit_code: i32) {
         // deallocate user res (including tid/trap_cx/ustack) of all threads
         // it has to be done before we dealloc the whole memory_set
         // otherwise they will be deallocated twice
+        kprintln!("[KERN] task::exit_current_and_run_next(): deallocate user res (tid/trap_cx/ustack) of all threads");
         for task in process_inner.tasks.iter().filter(|t| t.is_some()) {
             let task = task.as_ref().unwrap();
             let mut task_inner = task.inner_exclusive_access();
             task_inner.res = None;
         }
-
+        kprintln!("[KERN] task::exit_current_and_run_next(): clear children Vector in process_inner");
         process_inner.children.clear();
         // deallocate other data in user space i.e. program code/data section
+        kprintln!("[KERN] task::exit_current_and_run_next(): deallocate code/data in user space");
         process_inner.memory_set.recycle_data_pages();
         // drop file descriptors
+        kprintln!("[KERN] task::exit_current_and_run_next(): drop file descriptors");
         process_inner.fd_table.clear();
     }
+    kprintln!("[KERN] task::exit_current_and_run_next(): drop process");
     drop(process);
     // we do not have to save task context
     let mut _unused = TaskContext::zero_init();
-    kprintln!("[KERN] task::exit_current_and_run_next() end");
+    kprintln!("[KERN] task::exit_current_and_run_next() end, sched next task");
     schedule(&mut _unused as *mut _);
 }
 

os/src/task/process.rs

@@ -72,14 +72,14 @@ 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");
+        // memory_set with elf program headers/trampoline/user stack_base addr/entry_point
+        kprintln!("[KERN] task::process::PCB::new() begin");
+        kprintln!("[KERN] task::process::PCB::new(): build MemorySet, set trampoline, user_stack_base, 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");
+        kprintln!("[KERN] task::process::PCB::new(): allocate a pid");
         let pid_handle = pid_alloc();
-        kprintln!("[KERN] task::process::new(): new ProcessControlBlockInner");
+        kprintln!("[KERN] task::process::PCB::new(): new ProcessControlBlockInner");
         let process = Arc::new(Self {
             pid: pid_handle,
             inner: unsafe {
@@ -107,15 +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...) ");
+        kprintln!("[KERN] task::process::PCB::new(): create a main thread... start");
+        kprintln!("[KERN] task::process::PCB::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) ");
+        kprintln!("[KERN] task::process::PCB::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();
@@ -128,38 +128,43 @@ impl ProcessControlBlock {
             kstack_top,
             trap_handler as usize,
         );
-        kprintln!("[KERN] task::process::new(): create a main thread end");
+        kprintln!("[KERN] task::process::PCB::new(): create a main thread... done");
         // add main thread to the process
-        kprintln!("[KERN] task::process::new(): add main thread to the process");
+        kprintln!("[KERN] task::process::PCB::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);
-        kprintln!("[KERN] task::process::new(): insert <pid, PCB> in PID2PCB BTreeMap");
+        kprintln!("[KERN] task::process::PCB::new(): insert <pid, PCB> in PID2PCB BTreeMap");
         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 scheduler");
+        kprintln!("[KERN] task::process::PCB::new(): add_task(task): add main thread to scheduler");
         add_task(task);
-        kprintln!("[KERN] task::process::new() end");
+        kprintln!("[KERN] task::process::PCB::new() end");
         process
     }
 
     /// Only support processes with a single thread.
     pub fn exec(self: &Arc<Self>, elf_data: &[u8], args: Vec<String>) {
+        kprintln!("[KERN] task::process::PCB::exec() begin");
         assert_eq!(self.inner_exclusive_access().thread_count(), 1);
-        // memory_set with elf program headers/trampoline/trap context/user stack
-        kprintln!("[KERN] task::process::exec() begin");
+        // memory_set with elf program headers/trampoline/user_stack_base addr/entry_point
+        kprintln!("[KERN] task::process::PCB::exec(): build MemorySet,  trampoline, user_stack_base, entry_point...");
         let (memory_set, ustack_base, entry_point) = MemorySet::from_elf(elf_data);
         let new_token = memory_set.token();
         // substitute memory_set
+        kprintln!("[KERN] task::process::PCB::exec():  substitute memory_set, ustack_base");
         self.inner_exclusive_access().memory_set = memory_set;
         // then we alloc user resource for main thread again
         // since memory_set has been changed
         let task = self.inner_exclusive_access().get_task(0);
         let mut task_inner = task.inner_exclusive_access();
         task_inner.res.as_mut().unwrap().ustack_base = ustack_base;
+        kprintln!("[KERN] task::process::PCB::exec():  alloc user resource for this thread");
         task_inner.res.as_mut().unwrap().alloc_user_res();
+        kprintln!("[KERN] task::process::PCB::exec():  set  trap_cx_ppn for this thread");
         task_inner.trap_cx_ppn = task_inner.res.as_mut().unwrap().trap_cx_ppn();
         // push arguments on user stack
+        kprintln!("[KERN] task::process::PCB::exec():  push arguments on user stack for this thread");
         let mut user_sp = task_inner.res.as_mut().unwrap().ustack_top();
         user_sp -= (args.len() + 1) * core::mem::size_of::<usize>();
         let argv_base = user_sp;
@@ -185,6 +190,7 @@ impl ProcessControlBlock {
         // make the user_sp aligned to 8B for k210 platform
         user_sp -= user_sp % core::mem::size_of::<usize>();
         // initialize trap_cx
+        kprintln!("[KERN] task::process::PCB::exec():  set trap_cx(entry_point, ustack_top, k_satp, k_sp, trap_handler, argc=x[10], argv=x[11])");
         let mut trap_cx = TrapContext::app_init_context(
             entry_point,
             user_sp,
@@ -195,22 +201,22 @@ impl ProcessControlBlock {
         trap_cx.x[10] = args.len();
         trap_cx.x[11] = argv_base;
         *task_inner.get_trap_cx() = trap_cx;
-        kprintln!("[KERN] task::process::exec() end");
+        kprintln!("[KERN] task::process::PCB::exec() end");
     }
 
     /// Only support processes with a single thread.
     pub fn fork(self: &Arc<Self>) -> Arc<Self> {
-        kprintln!("[KERN] task::process::fork() begin");
+        kprintln!("[KERN] task::process::PCB::fork() begin");
         let mut parent = self.inner_exclusive_access();
         assert_eq!(parent.thread_count(), 1);
         // clone parent's memory_set completely including trampoline/ustacks/trap_cxs
-        kprintln!("[KERN] task::process::fork(): clone parent's memory_set for child");
+        kprintln!("[KERN] task::process::PCB::fork(): clone parent's memory_set for child");
         let memory_set = MemorySet::from_existed_user(&parent.memory_set);
         // alloc a pid
-        kprintln!("[KERN] task::process::fork(): alloc a new pid for child");
+        kprintln!("[KERN] task::process::PCB::fork(): alloc a new pid for child");
         let pid = pid_alloc();
         // copy fd table
-        kprintln!("[KERN] task::process::fork(): copy fd table for child");
+        kprintln!("[KERN] task::process::PCB::fork(): copy fd table for child");
         let mut new_fd_table: Vec<Option<Arc<dyn File + Send + Sync>>> = Vec::new();
         for fd in parent.fd_table.iter() {
             if let Some(file) = fd {
@@ -220,7 +226,7 @@ impl ProcessControlBlock {
             }
         }
         // create child process pcb
-        kprintln!("[KERN] task::process::fork(): new child PCB with new pid, memory_set, fd_table, ...");
+        kprintln!("[KERN] task::process::PCB::fork(): new child PCB with new pid, memory_set, fd_table, ...");
         let child = Arc::new(Self {
             pid,
             inner: unsafe {
@@ -241,10 +247,10 @@ impl ProcessControlBlock {
             },
         });
         // add child
-        kprintln!("[KERN] task::process::fork(): add child link in parent' children Vec");
+        kprintln!("[KERN] task::process::PCB::fork(): add child link in parent' children Vec");
         parent.children.push(Arc::clone(&child));
         // create main thread of child process
-        kprintln!("[KERN] task::process::fork(): TaskControlBlock::new(): create main thread of child process");
+        kprintln!("[KERN] task::process::PCB::fork(): TaskControlBlock::new(): create main thread of child process");
         let task = Arc::new(TaskControlBlock::new(
             Arc::clone(&child),
             parent
@@ -259,22 +265,22 @@ impl ProcessControlBlock {
             false,
         ));
         // attach task to child process
-        kprintln!("[KERN] task::process::fork(): attach child TCB to child PCB");
+        kprintln!("[KERN] task::process::PCB::fork(): attach child TCB to child PCB");
         let mut child_inner = child.inner_exclusive_access();
         child_inner.tasks.push(Some(Arc::clone(&task)));
         drop(child_inner);
         // modify kstack_top in trap_cx of this thread
-        kprintln!("[KERN] task::process::fork(): modify child's kstack_top in trap_cx of child");
+        kprintln!("[KERN] task::process::PCB::fork(): modify child's kstack_top in trap_cx of child");
         let task_inner = task.inner_exclusive_access();
         let trap_cx = task_inner.get_trap_cx();
         trap_cx.kernel_sp = task.kstack.get_top();
         drop(task_inner);
-        kprintln!("[KERN] task::process::fork(): insert <child pid, child PCB> in PID2PCB BTreeMap");
+        kprintln!("[KERN] task::process::PCB::fork(): insert <child pid, child PCB> in PID2PCB BTreeMap");
         insert_into_pid2process(child.getpid(), Arc::clone(&child));
         // add this thread to scheduler
-        kprintln!("[KERN] task::process::fork(): add_task(child task): add child thread to scheduler");
+        kprintln!("[KERN] task::process::PCB::fork(): add_task(child task): add child thread to scheduler");
         add_task(task);
-        kprintln!("[KERN] task::process::fork() end");
+        kprintln!("[KERN] task::process::PCB::fork() end");
         child
     }
 

os/src/task/task.rs

@@ -49,13 +49,13 @@ impl TaskControlBlock {
         ustack_base: usize,
         alloc_user_res: bool,
     ) -> Self {
-        kprintln!("[KERN] TaskControlBlock::new() begin");
+        kprintln!("[KERN] task::task::TaskControlBlock::new() begin");
         let res = TaskUserRes::new(Arc::clone(&process), ustack_base, alloc_user_res);
         let trap_cx_ppn = res.trap_cx_ppn();
-        kprintln!("[KERN] TaskControlBlock::new(): alloc kernel stack for TCB");
+        kprintln!("[KERN] task::task::TaskControlBlock::new(): alloc kernel stack for TCB");
         let kstack = kstack_alloc();
         let kstack_top = kstack.get_top();
-        kprintln!("[KERN] TaskControlBlock::new() end");
+        kprintln!("[KERN] task::task::TaskControlBlock::new() end");
         Self {
             process: Arc::downgrade(&process),
             kstack,

user/src/lib.rs

@@ -117,13 +117,16 @@ pub fn wait(exit_code: &mut i32) -> isize {
 }
 
 pub fn waitpid(pid: usize, exit_code: &mut i32) -> isize {
+    println!("[USER] lib::waitpid() begin");
     loop {
         match sys_waitpid(pid as isize, exit_code as *mut _) {
             -2 => {
                 yield_();
             }
             // -1 or a real pid
-            exit_pid => return exit_pid,
+            exit_pid => {
+                println!("[USER] lib::waitpid() end: exit_pid {}", exit_pid);
+                return exit_pid; }
         }
     }
 }