我想知道当前进程在Linux系统上运行的CPU，我有两个select –
task_struct获取字段on_cpu thread_info获得字段cpu 。 我编写了一个内核模块编程来探测这两个字段，并得到如下结果：
[ 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
我不知道这两个字段的正确含义。
thread_info的cpu字段指定正在执行进程的CPU的编号。 这是你正在寻找的。
task_struct的on_cpu标志实际上是上下文切换时的锁，并且希望在上下文切换期间启用中断，以便通过解锁runqueue来避免高延迟。 基本上当它是0时，任务可以被移动到不同的CPU。