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From: Zhang Qiao <zhangqiao22@huawei.com>
To: Tejun Heo <tj@kernel.org>
Cc: <linux-kernel@vger.kernel.org>, <juri.lelli@redhat.com>,
	<mingo@redhat.com>, <peterz@infradead.org>,
	<vincent.guittot@linaro.org>
Subject: Re: [PATCH] kernel/sched: Fix sched_fork() access an invalid sched_task_group
Date: Thu, 9 Sep 2021 17:45:16 +0800	[thread overview]
Message-ID: <3036e192-20ba-4345-66e6-14fa8b765d59@huawei.com> (raw)
In-Reply-To: <YTjk8oiFa5EfDPn9@slm.duckdns.org>



在 2021/9/9 0:29, Tejun Heo 写道:
> Hello,
> 
> On Wed, Sep 08, 2021 at 07:32:06PM +0800, Zhang Qiao wrote:
>> I will update this patch by following the steps below:
>> 1)rename cgroup_subsys->fork() to cgroup_subsys->post_fork();
>> 2)add cgroup_subsys->fork() and the cpu_cgroup_fork() callback like this:
>>
>> void cpu_cgroup_fork(struct task_struct *task) {
>> ....
>> 	p->sched_task_group = task_group(current);
>> 	__set_task_cpu(p, smp_processor_id());
>> 	if (p->sched_class->task_fork)
>> 		p->sched_class->task_fork(p);
>> ....
>>
>>
>> 3)call cgroup_subsys->fork() after cgroup_can_fork().
>>
>> Do you have any suggestion?
> 
> I'm not following why it needs to shuffle the callbacks. Can't you just
Just to provide a placeholder to call task_fork(). But thought about it,
there are indeed some problems with this modification.

Thanks.

Zhang Qiao

> relocate the fectching of task_group after can_fork?>
> Thanks.
> 

      reply	other threads:[~2021-09-09  9:45 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-26 11:26 Zhang Qiao
2021-08-30 11:49 ` Zhang Qiao
2021-08-30 14:39 ` Peter Zijlstra
2021-08-30 17:32   ` Tejun Heo
2021-08-31  7:58     ` Zhang Qiao
2021-08-31 22:59       ` Tejun Heo
2021-09-01  7:43         ` Zhang Qiao
2021-09-01 16:45           ` Tejun Heo
2021-09-02  7:42             ` Zhang Qiao
2021-09-07 17:01               ` Tejun Heo
2021-09-08 11:32                 ` Zhang Qiao
2021-09-08 16:29                   ` Tejun Heo
2021-09-09  9:45                     ` Zhang Qiao [this message]

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