我有两个选择 –
>在struct task_struct或中获取字段on_cpu
>在struct thread_info中获取字段cpu.
我编写了一个内核模块编程来探测这两个字段,然后得到
结果如下:
[ 3991.419185] the fIEld 'on_cpu' in task_struct is :1[ 3991.419187] the fIEld 'cpu' in thread_info is :0[ 3991.419199] the fIEld 'on_cpu' in task_struct is :1[ 3991.419200] the fIEld 'cpu' in thread_info is :0[ 3991.419264] the fIEld 'on_cpu' in task_struct is :1[ 3991.419266] the fIEld 'cpu' in thread_info is :1[ 3991.419293] the fIEld 'on_cpu' in task_struct is :1[ 3991.419294] the fIEld 'cpu' in thread_info is :1[ 3991.419314] the fIEld 'on_cpu' in task_struct is :1[ 3991.419315] the fIEld 'cpu' in thread_info is :1[ 3991.419494] the fIEld 'on_cpu' in task_struct is :1[ 3991.419495] the fIEld 'cpu' in thread_info is :0[ 3991.419506] the fIEld 'on_cpu' in task_struct is :1[ 3991.419507] the fIEld 'cpu' in thread_info is :1
我不知道这两个领域的正确含义.
解决方法 thread_info中的cpu字段指定执行进程的cpu的编号.这就是你要搜索的内容.task_struct中的on_cpu标志实际上是上下文切换时的锁定,并且希望在上下文切换期间启用中断,以便通过解锁的runqueue来避免高延迟.基本上当它为0时,任务可以移动到不同的cpu.
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