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Linux 发布时间：2022-03-31 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了linux – struct task_struct中字段’on_cpu’和struct thread_info中字段’cpu’的含义是什么？，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

概述

我想知道 Linux系统中当前进程正在运行哪个cpu, 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

我想知道 Linux系统中当前进程正在运行哪个cpu,
我有两个选择 – @H_607_20@ @H_607_20@>在struct task_struct或中获取字段on_cpu
>在struct thread_info中获取字段 cpu.

@H_607_20@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：

@H_607_20@

[ 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

@H_607_20@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. @H_607_20@ @H_607_20@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.