linux-kernel - Re: [PATCH] sched: fix cpu utilization account error

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Message-ID: <51D253CA.5080204@huawei.com>
Date:	Tue, 2 Jul 2013 12:15:06 +0800
From:	Xie XiuQi <xiexiuqi@...wei.com>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
CC:	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Li Zefan <lizefan@...wei.com>,
	Zhang Hang <bob.zhanghang@...wei.com>,
	Li Bin <huawei.libin@...wei.com>
Subject: Re: [PATCH] sched: fix cpu utilization account error

On 2013/7/2 11:20, Michael Wang wrote:
> Hi, Xie
> 
> On 07/01/2013 07:26 PM, Xie XiuQi wrote:
> [snip]
>> Here is the kthread main logic. Although it's not a good idea, but it does
>> exist:
>> while (!kthread_should_stop()) {
>> 	/* call schedule every 1 sec */
>> 	if (HZ <= jiffies - last) {
>> 		last = jiffies;
>> 		schedule();
>> 	}
>>
>> 	/* get data and sent it */
>> 	get_msg();
>> 	send_msg();
> 
> What about use cond_resched() here? Isn't that more gentle?
> 

That's a good idea for driver implementation.
Thank you Michael.

> Regards,
> Michael Wang
> 


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