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SubjectRe: [PATCH 08/10] psi: pressure stall information for CPU, memory, and IO
On Thu, Jul 12, 2018 at 01:29:40PM -0400, Johannes Weiner wrote:
> +static inline void psi_ttwu_dequeue(struct task_struct *p)
> +{
> + if (psi_disabled)
> + return;
> + /*
> + * Is the task being migrated during a wakeup? Make sure to
> + * deregister its sleep-persistent psi states from the old
> + * queue, and let psi_enqueue() know it has to requeue.
> + */
> + if (unlikely(p->in_iowait || (p->flags & PF_MEMSTALL))) {
> + struct rq_flags rf;
> + struct rq *rq;
> + int clear = 0;
> +
> + if (p->in_iowait)
> + clear |= TSK_IOWAIT;
> + if (p->flags & PF_MEMSTALL)
> + clear |= TSK_MEMSTALL;
> +
> + rq = __task_rq_lock(p, &rf);
> + update_rq_clock(rq);
> + psi_task_change(p, rq_clock(rq), clear, 0);
> + p->sched_psi_wake_requeue = 1;
> + __task_rq_unlock(rq, &rf);
> + }
> +}

Still NAK, what happened to this here:

https://lkml.kernel.org/r/20180514083353.GN12217@hirez.programming.kicks-ass.net

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