linux-kernel - Re: [PATCH v2 15/17] arm64: Remove custom IRQ stat accounting

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Message-ID: <jhjftajgfy6.mognet@arm.com>
Date:   Thu, 25 Jun 2020 19:26:09 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Russell King <linux@....linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Sumit Garg <sumit.garg@...aro.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>, kernel-team@...roid.com
Subject: Re: [PATCH v2 15/17] arm64: Remove custom IRQ stat accounting


On 24/06/20 20:58, Marc Zyngier wrote:
> @@ -801,26 +802,15 @@ void show_ipi_list(struct seq_file *p, int prec)
>       unsigned int cpu, i;
>
>       for (i = 0; i < NR_IPI; i++) {
> +		unsigned int irq = irq_desc_get_irq(ipi_desc[i]);
>               seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i,
>                          prec >= 4 ? " " : "");
>               for_each_online_cpu(cpu)
> -			seq_printf(p, "%10u ",
> -				   __get_irq_stat(cpu, ipi_irqs[i]));
> +			seq_printf(p, "%10u ", kstat_irqs_cpu(irq, cpu));
>               seq_printf(p, "      %s\n", ipi_types[i]);

How attached are we to that custom IPI printout? AIUI we *could* give them
a "prettier" name in request_percpu_irq() and let the standard procfs
printout take the wheel.