linux-kernel - Re: [RFC PATCH] arm64: defconfig: Disable fine-grained task level IRQ time accounting

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Date:   Wed, 29 Jul 2020 10:40:29 +0200
From:   Kurt Kanzenbach <kurt.kanzenbach@...utronix.de>
To:     Alison Wang <alison.wang@....com>, catalin.marinas@....com,
        will@...nel.org, paulmck@...nel.org, mw@...ihalf.com,
        leoyang.li@....com, vladimir.oltean@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     alison.wang@....com, Thomas Gleixner <tglx@...utronix.de>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>
Subject: Re: [RFC PATCH] arm64: defconfig: Disable fine-grained task level IRQ time accounting

Hi Alison,

On Wed Jul 29 2020, Alison Wang wrote:
> In the current arm64 defconfig, CONFIG_IRQ_TIME_ACCOUNTING is enabled as
> default. According to my tests on NXP's LayerScape and i.MX platforms,
> the system hangs when running the command "stress-ng --hrtimers 1" with
> CONFIG_IRQ_TIME_ACCOUNTING enabled. Disabling this option, the issue
> disappears. CONFIG_IRQ_TIME_ACCOUNTING causes serious performance impact
> when running hrtimer stress test at the same time.

I think instead of disabling the option for all arm64 devices, it might
be better to analyze the root-cause why the hrtimer test hangs when this
option is enabled.

+Cc hrtimer maintainers: Thomas and Anna-Maria

Thanks,
Kurt

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