Re: [PATCH] sched: fix cpu utilization account error

[Xie XiuQi <xiexiuqi@huawei.com>]

On 2013/7/2 11:07, Mike Galbraith wrote:
> On Mon, 2013-07-01 at 19:26 +0800, Xie XiuQi wrote:
> 
>> Here is the kthread main logic. Although it's not a good idea, but it does
>> exist:
> 
> Why not fix this instead?
> 
>> while (!kthread_should_stop()) {
>> 	/* call schedule every 1 sec */
>> 	if (HZ <= jiffies - last) {
>> 		last = jiffies;
>> 		schedule();
>> 	}
> 
> Hanging out in the kernel for ages is not cool.  That doesn't mean
> something else might not pop up that forces the issue, but to date it
> has not, and sacrificing precious fastpath cycles is not attractive.
> 

That is to say, the driver's code needs improvement.
Thank you Mike.

> -Mike
>