Re: [RFC PATCH v3 10/10] sched/fair: Throttle CFS tasks on return to userspace

[Peter Zijlstra]

On Thu, Jul 11, 2024 at 03:00:04PM +0200, Valentin Schneider wrote:
> +static inline void task_throttle_cancel_work(struct task_struct *p, int dst_cpu)
> +{
> +       /*
> +	* The calling context may be holding p->pi_lock, which is also acquired
> +	* by task_work_cancel_match().
> +	*
> +	* Lock recursion is prevented by punting the work cancellation to the
> +	* next IRQ enable. This is sent to the destination CPU rather than
> +	* >this< CPU to prevent the task from resuming execution and getting
> +	* throttled in its return to userspace.
> +	*/


u're having white space trouble there.. :-)

> +       irq_work_queue_on(&p->unthrottle_irq_work, dst_cpu);
> +}