linux-kernel - Re: [PATCH 6/7] psi: pressure stall information for CPU, memory, and IO

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Message-ID: <20180509100551.GL12217@hirez.programming.kicks-ass.net>
Date:   Wed, 9 May 2018 12:05:51 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-block@...r.kernel.org, cgroups@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>,
        Balbir Singh <bsingharora@...il.com>,
        Mike Galbraith <efault@....de>,
        Oliver Yang <yangoliver@...com>,
        Shakeel Butt <shakeelb@...gle.com>,
        xxx xxx <x.qendo@...il.com>,
        Taras Kondratiuk <takondra@...co.com>,
        Daniel Walker <danielwa@...co.com>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        Ruslan Ruslichenko <rruslich@...co.com>, kernel-team@...com
Subject: Re: [PATCH 6/7] psi: pressure stall information for CPU, memory, and
 IO

On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> +	u64 some[NR_PSI_RESOURCES] = { 0, };
> +	u64 full[NR_PSI_RESOURCES] = { 0, };

> +		some[r] /= max(nonidle_total, 1UL);
> +		full[r] /= max(nonidle_total, 1UL);

That's a bare 64bit divide.. that typically failed to build on 32bit
archs.