work queue

[Dave Tian]

You were not creating a new worker but using the generic kernel worker (kworker) to handle your work. Besides, there is no CPU bound for this work, which means any CPU is able to run the work.

Dave Tian
dave.jing.tian at gmail.com



> On Nov 19, 2014, at 11:21 PM, 户户 <6563572 at 163.com> wrote:
> 
> I'm playing around with work_queue in my VMware workstation. but I hit a problem that the work is processed by [kworker/3:1] other than my work queue.
> 
> static int __init test_init(void)
> {
>     pr_info(" (*) test_init start - pid:%d. cpu:%d\n", current->pid, get_cpu());
>     int ret = 0;
>     test_queue_ptr = create_workqueue("myfoo");
>     // test_queue_ptr = create_singlethread_workqueue("test_workqueue");
>     
>     if(!test_queue_ptr){
>         goto test_queue_ptr_error;
>     }
>     INIT_WORK(&test_work, test_cb);
>     // ret = queue_work(test_queue_ptr, &test_work);
>     ret = queue_work_on(get_cpu(), test_queue_ptr, &test_work);
>     // schedule_work(&test_work);
>     pr_info(" (*) test_init - queue_work_on return:%d. \n", ret);
>     return 0;
> test_queue_ptr_error:
>     destroy_workqueue(test_queue_ptr);
>     return 0;
> }
> 
> static void test_cb(struct work_struct *work)
> {
>     pr_info(" (*) test_cb - pid:%d. cpu:%d\n", current->pid, get_cpu());
> }
> 
> isnmod the module gives me the output :
> 
> Nov 19 23:11:18 test kernel: [ 3031.766137]  (*) test_init start - pid:8594. cpu:3
> Nov 19 23:11:18 test kernel: [ 3031.766371]  (*) test_init - queue_work_on return:1. 
> Nov 19 23:11:18 test kernel: [ 3031.766672]  (*) test_cb - pid:83. cpu:3  <--- this line indicates "test_cb" function is running on process 83 ([kworker/3:1]).
> 
> ps aux
> ....
> root        82  0.0  0.0      0     0 ?        S<   22:20   0:00 [charger_manager]
> root        83  0.0  0.0      0     0 ?        S    22:20   0:00 [kworker/3:1]
> root        85  0.0  0.0      0     0 ?        S    22:20   0:00 [kworker/0:2]
> root       217  0.0  0.0      0     0 ?        S<   22:20   0:00 [mpt_poll_0]
> 
> Thanks
> Jay
> 
> 
> 
> 
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