parrotshen.blogspot.com

Parrot's Note Book

Process Scheduling - 4. 一般行程的優先順序的值是 100 (highest priority) 至 139 (lowest priority)，行程一開始時會被賦予初始的優先順序，. 稱為 static priority；之後在執行的期間，排程器會藉由動態增減的方式來調整優先順序，此為 dynamic priority。 Real-time 行程的優先順序則是 1 (highest priority) 至 99 (lowest priority)，又稱為 real-time priority。用來決定行程的 CPU 使用時間(base time quantum)，優先順序愈高(數字愈小)，執行時間也就愈長。行程的 static priority 是繼承其父行程而來，也可以藉由設定 nice 值來做修改。作為排程器挑選行程來執行的優先順序，dynamic priority 會在行程執行期間隨 bonus 值調整。 Priority of a process goes from 0.MAX PRIO-1, valid RT. Can work with better when ...

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Parrot's Note Book | parrotshen.blogspot.com Reviews

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Process Scheduling - 4. 一般行程的優先順序的值是 100 (highest priority) 至 139 (lowest priority)，行程一開始時會被賦予初始的優先順序，. 稱為 static priority；之後在執行的期間，排程器會藉由動態增減的方式來調整優先順序，此為 dynamic priority。 Real-time 行程的優先順序則是 1 (highest priority) 至 99 (lowest priority)，又稱為 real-time priority。用來決定行程的 CPU 使用時間(base time quantum)，優先順序愈高(數字愈小)，執行時間也就愈長。行程的 static priority 是繼承其父行程而來，也可以藉由設定 nice 值來做修改。作為排程器挑選行程來執行的優先順序，dynamic priority 會在行程執行期間隨 bonus 值調整。 Priority of a process goes from 0.MAX PRIO-1, valid RT. Can work with better when ...

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1 parrot's note book

2 static priority

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4 下表列出與行程的優先權相關的參數：

5 定義於 include/linux/sched h

6 定義於 kernel/sched c

7 and back

8 張貼者：

9 parrot

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parrot's note book,static priority,dynamic priority,下表列出與行程的優先權相關的參數：,定義於 include/linux/sched h,定義於 kernel/sched c,and back,張貼者：,parrot,沒有留言,較舊的文章,關於我自己,檢視我的完整簡介,linux kernel,網誌存檔

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Parrot's Note Book | parrotshen.blogspot.com Reviews

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Process Scheduling - 4. 一般行程的優先順序的值是 100 (highest priority) 至 139 (lowest priority)，行程一開始時會被賦予初始的優先順序，. 稱為 static priority；之後在執行的期間，排程器會藉由動態增減的方式來調整優先順序，此為 dynamic priority。 Real-time 行程的優先順序則是 1 (highest priority) 至 99 (lowest priority)，又稱為 real-time priority。用來決定行程的 CPU 使用時間(base time quantum)，優先順序愈高(數字愈小)，執行時間也就愈長。行程的 static priority 是繼承其父行程而來，也可以藉由設定 nice 值來做修改。作為排程器挑選行程來執行的優先順序，dynamic priority 會在行程執行期間隨 bonus 值調整。 Priority of a process goes from 0.MAX PRIO-1, valid RT. Can work with better when ...

INTERNAL PAGES

parrotshen.blogspot.com

1

Parrot's Note Book: 三月 2010

http://parrotshen.blogspot.com/2010_03_01_archive.html

Linux Synchronization - 4. Scheduling while atomic: x/y/z. 其中 x 為行程的名稱 (current- comm). 12288;　 y 為16進制的 preempt count. 12288;　 z 為 PID. 出現此訊息時，表示目前的 kernel task 是一個不可被中斷的行程，但卻被排程進入休眠。 Schedule() is the main scheduler function. Asmlinkage void sched schedule(void). 12288;　long *switch count;. 12288;　task t *prev, *next;. 12288;　runqueue t *rq;. 12288;　prio array t *array;. 12288;　struct list head *queue;. 12288;　unsigned long long now;. 12288;　unsigned long run time;. 12288;　int cpu, idx;. 12288;　 .

2

Parrot's Note Book: 一月 2010

http://parrotshen.blogspot.com/2010_01_01_archive.html

Linux Interrupts and Exceptions - 5. Kernel 使用 CPU 資源的策略如下：. 1 若 CPU 在執行 User mode 程式時有中斷發生，則切換 CPU 執行權去處理中斷要求。 2 若 CPU 在執行 Kernel mode 程式時有中斷發生，則切換 CPU 執行權去處理中斷要求。 3 若 CPU 在處理中斷服務時有另一個中斷發生，則切換 CPU 執行權去處理新的中斷要求，接著再繼續原來的中斷服務。 4 中斷請求結束後，CPU 可能會去處理其他的 Kernel mode 程式，而不是原來在中斷發生前正在處理的 Kernel mode 程式。以上規則 1 3 就是核心對巢狀 Exception 及 Interrupt 的處理方式，而規則 4 則是 Kernel preemption. 的特性—在 Kernel mode 中，. 一個正在執行的 process 可以被另一個 process (有較高的執行優先權) 所取代，也就是行程可搶奪 CPU 的使用權。標籤： Linux Kernel. 訂閱：文章 (Atom).

3

Parrot's Note Book: Process Scheduling - 4

http://parrotshen.blogspot.com/2011/08/process-scheduling-4.html

Process Scheduling - 4. 一般行程的優先順序的值是 100 (highest priority) 至 139 (lowest priority)，行程一開始時會被賦予初始的優先順序，. 稱為 static priority；之後在執行的期間，排程器會藉由動態增減的方式來調整優先順序，此為 dynamic priority。 Real-time 行程的優先順序則是 1 (highest priority) 至 99 (lowest priority)，又稱為 real-time priority。用來決定行程的 CPU 使用時間(base time quantum)，優先順序愈高(數字愈小)，執行時間也就愈長。行程的 static priority 是繼承其父行程而來，也可以藉由設定 nice 值來做修改。作為排程器挑選行程來執行的優先順序，dynamic priority 會在行程執行期間隨 bonus 值調整。 Priority of a process goes from 0.MAX PRIO-1, valid RT. Can work with better when ...

4

Parrot's Note Book: 三月 2008

http://parrotshen.blogspot.com/2008_03_01_archive.html

Linux Process - 4. 8226; 在 User Space 執行的程式. 實際上是透過系統呼叫，切換到 Kernel Mode 進行行程建立的動作). 8226; 在 Kernel Space 執行的程式. 產生 Kernel Mode 的行程. 無論是以上哪種方式，最後產生出行程的工作，都是由 do fork(). 而 do fork() 主要的工作是複製父行程的 Task 結構給子行程，並給予新的 PID. 此時，父、子行程會暫時共用資源，只有 PID、堆疊空間等特定的資料會不同. 當子行程對共享資源有寫入的動作時，再進行對應的資料複製，稱為 Copy-on-Write 的技術. User Space 的行程的終止，是在 main() 程式結束返回處插入 return(). 結果會經由系統呼叫切換到 Kernel Space，然後進行終止程序的動作). 8226; 行程被 Kernel 結束執行. 例如，行程收到 kill 的訊號，或因發生錯誤而停止執行，或系統重開機 . 無論是以上哪種方式，最後的清理工作都是由 do exit(). 標籤： Linux Kernel.

5

Parrot's Note Book: 六月 2011

http://parrotshen.blogspot.com/2011_06_01_archive.html

Process Scheduling - 3. 8226; wait queue. 相對於 run queue 的是 wait queue，這是一個存放休眠中的行程的佇列。由型態為 wait queue t 的雙向鏈結串列所組成，並具有一個型態為 wait queue head t 的串列首。 Wait queue t 結構中的 flags 值為 1 時，進入休眠的行程是 exclusive process. 若 flags 值為 0 時，則是 nonexclusive process. 而 func 欄位會在初始化時設定成 default wake function(). 65292;這是 exclusive process 的預設喚醒函式。 Wait queue head 可以靜態的宣告：. DECLARE WAIT QUEUE HEAD( wait head );. Wait queue head t wait head;. Init waitqueue head( &wait head );. Wait event(wait head, condition). Define wait even...

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Process Scheduling - 4. 一般行程的優先順序的值是 100 (highest priority) 至 139 (lowest priority)，行程一開始時會被賦予初始的優先順序，. 稱為 static priority；之後在執行的期間，排程器會藉由動態增減的方式來調整優先順序，此為 dynamic priority。 Real-time 行程的優先順序則是 1 (highest priority) 至 99 (lowest priority)，又稱為 real-time priority。用來決定行程的 CPU 使用時間(base time quantum)，優先順序愈高(數字愈小)，執行時間也就愈長。行程的 static priority 是繼承其父行程而來，也可以藉由設定 nice 值來做修改。作為排程器挑選行程來執行的優先順序，dynamic priority 會在行程執行期間隨 bonus 值調整。 Priority of a process goes from 0.MAX PRIO-1, valid RT. Can work with better when ...

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