ucore作業系統學習(四) ucore lab4核心執行緒管理

1. ucore lab4介紹
   什麼是程式？
   　　現代作業系統為了滿足人們對於多道程式設計的需求，希望在計算機系統上能併發的同時執行多個程式，且彼此間互相不干擾。當一個程式受制於等待I/O完成等事件時，可以讓出CPU給其它程式使用，令寶貴的CPU資源得到更充分的利用。

作業系統作為大總管需要協調管理各個程式對CPU資源的使用，為此抽象出了程式(Process)的概念。程式顧名思義就是進行中、執行中的程式。

物理層面上，一個CPU核心同一時間只能執行一個程式，或者說一個CPU核心某一時刻只能歸屬於一個特定程式。但邏輯層面上，作業系統可以進行程式排程，既可以為程式分配CPU資源，令其執行，也可以在發生等待外設I/O時，避免CPU空轉而暫時掛起當前程式，令其它程式獲得CPU。

程式能夠隨時在執行與掛起中切換，且每次恢復執行時都能夠接著上次被打斷掛起的地方接著執行。這就需要作業系統有能力保留程式在被掛起時的CPU暫存器上下文快照，當CPU中的暫存器被另外的程式給覆蓋後，在恢復時能正確的還原之前被打斷時的執行現場。新老程式在CPU上交替時，新排程執行緒上下文的恢復和被排程執行緒上下文的儲存行為被稱作程式的上下文切換。

什麼是執行緒？
　　程式是一個獨立的程式，與其它程式的記憶體空間是相互隔離的，也作為一個CPU排程的單元工作著，似乎很好的滿足了需求。但有時候也存在一些場景，比如一個檔案處理程式一方面需要監聽並接受來自使用者的輸入，另一方面也要對使用者的輸入內容進行復雜，耗費大量時間的資料處理工作。人們希望在一個程式中既能處理耗時的複雜操作(例如定時存檔等大量的磁碟I/O)，同時不能阻塞避免其無法及時的響應使用者指令。

由於響應使用者輸入指令的程式與批處理程式都需要訪問同樣的內容，雖然作業系統提供了各式各樣的程式間通訊手段，但依然效率不高，為此，電腦科學家提出了執行緒(Thread)的概念。

執行緒是屬於程式的，同一程式下所有執行緒都共享程式擁有的同一片記憶體空間，沒有額外的訪問限制；但每個執行緒有著自己的執行流和排程狀態，包括程式計數器在內的CPU暫存器上下文是執行緒間獨立的。這樣上述的需求就能通過在檔案處理程式中開啟兩個執行緒分別提供使用者服務和後臺批處理服務來實現。通過作業系統合理的排程，既能實時的處理使用者指令，又不耽誤後臺的批處理任務。

lab4相對於lab3的主要改進
　　1. 在/kern/process/proc.[ch]中實現了程式/執行緒的建立、初始化、退出以及控制執行緒的執行狀態等功能。

2. 在/kern/process/switch.S中實現了執行緒的上下文切換功能。

3. 在/kern/trap/trapentry.S中實現了forkrets，用於do_forks建立子執行緒後呼叫的返回處理。

4. 在/kern/schedule/sched.[ch]中實現了一個最基本的FIFO的執行緒CPU排程演算法。

5. 參考linux引入了slab分配器，修改了之前實驗中對於實體記憶體分配/回收的邏輯(如果不是學有餘力，可以暫時不用理會，當做黑盒子看待就行)。

lab4是建立在之前實驗的基礎之上的，需要先理解之前的實驗內容才能順利理解lab4的內容。

可以參考一下我關於前面實驗的部落格：

1. ucore作業系統學習(一) ucore lab1系統啟動流程分析

2. ucore作業系統學習(二) ucore lab2實體記憶體管理分析

3. ucore作業系統學習(三) ucore lab3虛擬記憶體管理分析

2. ucore lab4實驗細節分析
   　　得益於ucore在lab2、lab3中建立起了較為完善的物理、虛擬記憶體管理機制，得以在lab4實驗中建立起記憶體空間獨立的程式機制，以及執行流獨立的執行緒功能。2.1 執行緒的建立與初始化
   　　ucore在lab4中建立了程式/執行緒的機制，在總控函式kern_init中，通過pmm_init建立了常駐核心的第0號執行緒idle_proc和第1號執行緒init_proc。

整個ucore核心可以被視為一個程式(核心程式)，而上述兩個執行緒的cr3指向核心頁表boot_cr3，且其程式碼段、資料段選擇子特權級都處於核心態，屬於核心執行緒。　在proc_init函式可以看到，ucore中要建立一個新的核心執行緒(init_proc)，是通過kernel_thread實現的。建立核心執行緒時，新執行緒相當於是current當前執行緒fork出的一個子執行緒。

呼叫kernel_thread函式時，需要指定執行緒的執行入口(例如：init_main)，入口函式的引數(例如：“Hello world!”)，以及指定是否需要採取寫時複製的機制進行fork時父子程式的記憶體對映。2.2 ucore執行緒排程時執行緒上下文的切換
　　由於在proc_init中，令全域性變數current指向了idle_proc，代表當前佔用CPU的是執行緒idel_proc，設定idel_proc的need_resched為1。proc_init函式返回，總控函式kern_init完成了一系列初始化工作後，最終執行了cpu_idle函式。

cpu_idle函式可以視為idle_proc的執行流，在其中進行了一個while(1)的無限迴圈，當發現自己需要被排程時，呼叫schedule函式進行一次執行緒的排程。2.3 什麼是執行緒的上下文？
　　在proc_run中，呼叫了switch_to函式。switch_to是彙編實現的函式(子過程)，其引數是兩個struct context結構體的指標。

第一個引數from代表著當前執行緒的上下文，第二個引數to代表著新執行緒的上下文，switch_to的功能就是保留current執行緒的上下文至from上下文結構中，並將to上下文結構中的內容載入到CPU的各個暫存器中，恢復新執行緒的執行流上下文現場。由於函式呼叫時是先呼叫後返回的，整個執行流程體現出一種先進後出的結構，因此普遍採用棧來實現函式呼叫，且不同執行流之間的棧是互相隔離的。ucore中，執行緒的上下文除了各個通用暫存器、段暫存器、指令指標暫存器等暫存器上下文之外，還需要額外的維護各自的棧結構。當然如果發生了程式間的切換，還需要切換頁表。

80386由於引入了特權級機制，為了避免不同特權級之間棧上資料的互相干擾，要求一個程式(執行緒)在不同特權級下維護不同的棧。具體的各個特權級棧指標儲存在當前程式的TSS任務狀態段中，由TR暫存器控制。80386的設計者希望作業系統的設計者通過TSS任務狀態段機制，由硬體來處理不同任務(執行緒執行流)的上下文切換。

也許是出於對作業系統與硬體耦合性以及效能的影響，Linux核心並沒有充分的利用80386提供的任務切換機制。

linux不使用任務門(轉載)：

Intel的這種設計確實很周到，也為任務切換提供了一個非常簡潔的機制。但是，由於i386的系統結構基本上是CISC的，通過JMP指令或CALL（或中斷）完成任務的過程實際上是“複雜指令”的執行過程，其執行過程長達300多個CPU週期（一個POP指令佔12個CPU週期），因此，Linux核心並不完全使用i386CPU提供的任務切換機制。

由於i386CPU要求軟體設定TR及TSS，Linux核心只不過“走過場”地設定TR及TSS，以滿足CPU的要求。但是，核心並不使用任務門，也不使用JMP或CALL指令實施任務切換。核心只是在初始化階段設定TR，使之指向一個TSS，從此以後再不改變TR的內容了。也就是說，每個CPU（如果有多個CPU）在初始化以後的全部執行過程中永遠使用那個初始的TSS。同時，核心也不完全依靠TSS儲存每個程式切換時的暫存器副本，而是將這些暫存器副本儲存在各個程式自己的核心棧中。

這樣一來，TSS中的絕大部分內容就失去了原來的意義。那麼，當進行任務切換時，怎樣自動更換堆疊？我們知道，新任務的核心棧指標（SS0和ESP0）應當取自當前任務的TSS，可是，Linux中並不是每個任務就有一個TSS，而是每個CPU只有一個TSS。Intel原來的意圖是讓TR的內容（即TSS）隨著任務的切換而走馬燈似地換，而在Linux核心中卻成了只更換TSS中的SS0和ESP0，而不更換TSS本身，也就是根本不更換TR的內容。這是因為，改變TSS中SS0和ESP0所花費的開銷比通過裝入TR以更換一個TSS要小得多。因此，在Linux核心中，TSS並不是屬於某個程式的資源，而是全域性性的公共資源。在多處理機的情況下，儘管核心中確實有多個TSS，但是每個CPU仍舊只有一個TSS。

為什麼執行緒切換時要修改esp0？
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　　ucore在設計上大量參考了早期32位linux核心的設計，因此和Linux一樣也沒有完全利用硬體提供的任務切換機制。整個OS週期只在核心初始化時設定了TR暫存器和TSS段的內容(gdt_init函式中)，之後便不再對其進行大的修改，而是僅僅線上程上下文切換時，令TSS段中的esp0指向當前執行緒的核心棧頂(proc_run)。這麼做的原因一是ucore只使用了ring0和ring3兩個特權級，所有執行緒的ring0核心棧是由ucore全盤控制的，而在後續lab5之後的使用者態執行緒其ring3棧則是由應用程式自己控制的；二是由於在發生特權級切換的中斷時，80386CPU會將中斷引數壓入新特權級對應的棧上，如果發生使用者態->核心態的切換時，esp0必須指向當前執行緒自己的核心棧，否則將會出現不同執行緒核心棧資料的混亂，造成嚴重後果。

2.4 init_proc執行緒生命週期全過程分析
　　分析到switch_to之後，init_proc執行緒似乎已經完成了從建立並初始化並進行上下文切換，獲得並佔用CPU的全過程。但實際上還剩下了關鍵的一環沒有分析。