linux-kernel - Re: [PATCH 08/10] psi: pressure stall information for CPU, memory, and IO

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Date:   Tue, 17 Jul 2018 16:16:14 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        Christopher Lameter <cl@...ux.com>,
        Mike Galbraith <efault@....de>,
        Shakeel Butt <shakeelb@...gle.com>, linux-mm@...ck.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com
Subject: Re: [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:
> +/* Tracked task states */
> +enum psi_task_count {
> +	NR_RUNNING,
> +	NR_IOWAIT,
> +	NR_MEMSTALL,
> +	NR_PSI_TASK_COUNTS,
> +};

> +/* Resources that workloads could be stalled on */
> +enum psi_res {
> +	PSI_CPU,
> +	PSI_MEM,
> +	PSI_IO,
> +	NR_PSI_RESOURCES,
> +};

These two have mem and iowait in different order. It really doesn't
matter, but my brain stumbled.