linux-kernel - Re: [PATCH sched_ext/for-6.11] sched_ext: Reverting @p->sched

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Message-ID: <ba2702f9-f66e-498b-853c-d23f1f9191bc@huawei.com>
Date: Tue, 16 Jul 2024 19:32:09 +0800
From: "Zhangqiao (2012 lab)" <zhangqiao22@...wei.com>
To: Tejun Heo <tj@...nel.org>
CC: <void@...ifault.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH sched_ext/for-6.11] sched_ext: Reverting @p->sched_class
 if @p->disallow is set

hi,

在 2024/7/12 2:57, Tejun Heo 写道:
> Hello,
>
> On Thu, Jul 11, 2024 at 07:07:20PM +0800, Zhangqiao (2012 lab) wrote:
> ...
>>   		if (p->policy == SCHED_EXT) {
>>   			p->policy = SCHED_NORMAL;
>> +			p->sched_class = &fair_sched_class;
>>   			atomic_long_inc(&scx_nr_rejected);
> Did you see any issues with the existing implementation? The policy is set
> before the task is attached, so it should work fine. Also, you can't change
> sched_class by just assigning to it.

What does "attach" mean? I'm not sure. p->sched_class is assigned in 
__sched_fork()
which is performed before scx_ops_init_task().

>
> Thanks.
>