重写调度模块 (#679)

## PR：重写调度模块
--- 
### 完成的部分
- 实现cfs调度策略
- 搭建框架，后续功能可以迭代开发
- 目前能跑，未测试性能

### 需要后续接力的部分
- 实现组内调度（task_group）
- 实现跨核负载均衡（pelt算法）
- 接入sysfs，实现参数动态调节（sched_stat等）
- nice值以及priority等参数的设置及调优

kernel/src/net/event_poll/mod.rs

@@ -11,7 +11,6 @@ use alloc::{
 use system_error::SystemError;
 
 use crate::{
-    arch::sched::sched,
     filesystem::vfs::{
         file::{File, FileMode},
         FilePrivateData, IndexNode, Metadata,
@@ -24,6 +23,7 @@ use crate::{
         wait_queue::WaitQueue,
     },
     process::ProcessManager,
+    sched::{schedule, SchedMode},
     time::{
         timer::{next_n_us_timer_jiffies, Timer, WakeUpHelper},
         TimeSpec,
@@ -489,7 +489,7 @@ impl EventPoll {
                 let guard = epoll.0.lock_irqsave();
                 unsafe { guard.epoll_wq.sleep_without_schedule() };
                 drop(guard);
-                sched();
+                schedule(SchedMode::SM_NONE);
                 // 被唤醒后,检查是否有事件可读
                 available = epoll.0.lock_irqsave().ep_events_available();
                 if let Some(timer) = timer {

kernel/src/net/socket/mod.rs

@@ -15,7 +15,7 @@ use smoltcp::{
 use system_error::SystemError;
 
 use crate::{
-    arch::{rand::rand, sched::sched},
+    arch::rand::rand,
     filesystem::vfs::{
         file::FileMode, syscall::ModeType, FilePrivateData, FileSystem, FileType, IndexNode,
         Metadata,
@@ -25,6 +25,7 @@ use crate::{
         spinlock::{SpinLock, SpinLockGuard},
         wait_queue::EventWaitQueue,
     },
+    sched::{schedule, SchedMode},
 };
 
 use self::{
@@ -337,8 +338,9 @@ impl IndexNode for SocketInode {
         _offset: usize,
         len: usize,
         buf: &mut [u8],
-        _data: SpinLockGuard<FilePrivateData>,
+        data: SpinLockGuard<FilePrivateData>,
     ) -> Result<usize, SystemError> {
+        drop(data);
         self.0.lock_no_preempt().read(&mut buf[0..len]).0
     }
 
@@ -347,8 +349,9 @@ impl IndexNode for SocketInode {
         _offset: usize,
         len: usize,
         buf: &[u8],
-        _data: SpinLockGuard<FilePrivateData>,
+        data: SpinLockGuard<FilePrivateData>,
     ) -> Result<usize, SystemError> {
+        drop(data);
         self.0.lock_no_preempt().write(&buf[0..len], None)
     }
 
@@ -417,7 +420,7 @@ impl SocketHandleItem {
                 .sleep_without_schedule(events)
         };
         drop(handle_map_guard);
-        sched();
+        schedule(SchedMode::SM_NONE);
     }
 
     pub fn shutdown_type(&self) -> ShutdownType {