如何设置对内核线程的亲和力? [英] How one can set affinity for kernel threads?

问题描述

在Linux内核上， 3.11.0-13-generic ，我无法为内核线程设置相似性，如以下示例所示:

On a Linux kernel 3.11.0-13-generic i can't set affinity for kernel threads as in the following example:

>ps -p 828
  PID TTY          TIME CMD
  828 ?        00:00:00 nfsiod
>sudo taskset -pc 7 828
pid 828's current affinity list: 0-11
taskset: failed to set pid 828's affinity: Invalid argument
>sudo taskset -pc 7 17551
pid 17551's current affinity list: 7
pid 17551's new affinity list: 7
>

17551是用户进程，nfsiod是内核线程.如何更改对作为内核线程运行的nfsiod守护进程的亲和力?

17551 is a user process, and nfsiod is a kernel thread. How can I change the affinity for the nfsiod deamon running as a kernel thread ?

推荐答案

许多内核线程将标志设置为 PF_NO_SETAFFINITY :

Many kernel threads set the flag PF_NO_SETAFFINITY:

#define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */

要更改亲和力，您必须更改内核.

To change the affinity, you would have to change the kernel.

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