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

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Message-ID: <20180717153238.GA2476@hirez.programming.kicks-ass.net>
Date:   Tue, 17 Jul 2018 17:32:38 +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:
> +struct psi_group {
> +	struct psi_group_cpu *cpus;

That one wants a __percpu annotation on I think. Also, maybe a rename.

> +
> +	struct mutex stat_lock;
> +
> +	u64 some[NR_PSI_RESOURCES];
> +	u64 full[NR_PSI_RESOURCES];
> +
> +	unsigned long period_expires;
> +
> +	u64 last_some[NR_PSI_RESOURCES];
> +	u64 last_full[NR_PSI_RESOURCES];
> +
> +	unsigned long avg_some[NR_PSI_RESOURCES][3];
> +	unsigned long avg_full[NR_PSI_RESOURCES][3];
> +
> +	struct delayed_work clock_work;
> +};