bmap

kernel 重置

Kernel 重製:

流程:

1. 設定 kernel 選項
2. 編譯 kernel
3. 編譯 modules, 安裝 modules
4. 安裝 kernel
5. 設定 boot loader
6. 重新開機

步驟:

1. cd 您解壓後的目錄下的 linux 目錄中
2. make mrproper
3. make xconfig (menuconfig 或 config), 它會存成 .config
4. make dep
5. make bzImage
6. make modules
7. make modules_install
8. cp arch/boot/i386/bzImage /boot
9. 編輯 /etc/lilo.conf 或 /boot/grub/grub.conf
10. 執行 lilo -v -v; 若是使用 grub, 則不必.
11. reboot

scheduler

schedule_timeout
ex:
schedule_timeout(30*HZ);
// sleep for 30 seconds.

linux question website

http://www.linuxquestions.org/questions/programming-9/

linux question website

http://www.linuxquestions.org/questions/programming-9/

kthread

find current kernel threads in the system:
ps -ef
the process with [ ] is kernel thread

is kernel thread preemptive?
1. if CONFIG_PREEMPT is defined, kernel thread is preemptive
2. if CONFIG_PREEMPT is not defined, kernel thread is not preemptive. It will freeze the system if it doesn’t go to sleep.

kthread_create

kernel_thread

resource:
http://svn.openfoundry.org/vwebsdk/Reference/kernel_thread.txt
http://www.jollen.org/blog/2006/11/_scheduler_running_process.html#more

interrupt

in_interrupt():

 to find out whether it's executing in interrupt context.