From: Tejun Heo <tj@kernel.org>
To: Zhang Qiao <zhangqiao22@huawei.com>
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: Wed, 8 Sep 2021 06:29:38 -1000 [thread overview]
Message-ID: <YTjk8oiFa5EfDPn9@slm.duckdns.org> (raw)
In-Reply-To: <be0bdf5a-479c-51bb-6d51-42739c11710d@huawei.com>
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
relocate the fectching of task_group after can_fork?
Thanks.
--
tejun
next prev parent reply other threads:[~2021-09-08 16:29 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-26 11:26 [PATCH] kernel/sched: Fix sched_fork() access an invalid sched_task_group 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 [this message]
2021-09-09 9:45 ` Zhang Qiao
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