[Linux] [kernel module] Specify / limit the execution CPU of kthread

Related to the following articles. A note on how to limit the CPU cores on which each kthread runs.

[Linux] [kernel module] Create kthread in kernel module --Qiita

Realization method

You can use void kthread_bind (struct task_struct * k, unsigned int cpu).

kthread_bind()/linux2.6 - LinuxKernelHackJapan

If you specify more than one, there is also kthread_bind_mask (2), so you should use this (unverified).

void kthread_bind_mask(struct task_struct *k, const struct cpumask *mask)

Example of use

Example of use

struct task_struct *k0;
struct task_struct *k1;

k0 = kthread_run(kthread_func0, NULL, "task0");
k1 = kthread_run(kthread_func1, NULL, "task1");

kthread_bind(k0, 0);
kthread_bind(k1, 1);

Specify the task_struct and cpu core number obtained at the time of kthread_run (). See / proc / cpuinfo etc. for the status of cpu in the current environment.

Relation

[Linux] [kernel module] Create kthread in kernel module --Qiita

reference

linux/include/linux/kthread.h - Elixir - Free Electrons kthread_bind()/linux2.6 - LinuxKernelHackJapan