Re: [PATCH] cgroup/cpuset: Change nr_deadline_tasks to an atomic_t value

[Juri Lelli]

Hi,

On 09/10/23 15:15, Waiman Long wrote:
> The nr_deadline_tasks field in cpuset structure was introduced by
> commit 6c24849f5515 ("sched/cpuset: Keep track of SCHED_DEADLINE task
> in cpusets"). Unlike nr_migrate_dl_tasks which is only modified under
> cpuset_mutex, nr_deadline_tasks can be updated in various contexts
> under different locks. As a result, data races may happen that cause
> incorrect value to be stored in nr_deadline_tasks leading to incorrect

Could you please make an example of such data races?

Thanks!
Juri