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From: Kurt Kanzenbach <kurt.kanzenbach@linutronix.de>
To: Alison Wang <alison.wang@nxp.com>,
	catalin.marinas@arm.com, will@kernel.org, paulmck@kernel.org,
	mw@semihalf.com, leoyang.li@nxp.com, vladimir.oltean@nxp.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>,
	alison.wang@nxp.com,
	Anna-Maria Gleixner <anna-maria@linutronix.de>
Subject: Re: [RFC PATCH] arm64: defconfig: Disable fine-grained task level IRQ time accounting
Date: Wed, 29 Jul 2020 10:40:29 +0200	[thread overview]
Message-ID: <877dumbtoi.fsf@kurt> (raw)
In-Reply-To: <20200729033934.22349-1-alison.wang@nxp.com>


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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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WARNING: multiple messages have this Message-ID (diff)
From: Kurt Kanzenbach <kurt.kanzenbach@linutronix.de>
To: Alison Wang <alison.wang@nxp.com>,
	catalin.marinas@arm.com, will@kernel.org, paulmck@kernel.org,
	mw@semihalf.com, leoyang.li@nxp.com, vladimir.oltean@nxp.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Cc: alison.wang@nxp.com, Thomas Gleixner <tglx@linutronix.de>,
	Anna-Maria Gleixner <anna-maria@linutronix.de>
Subject: Re: [RFC PATCH] arm64: defconfig: Disable fine-grained task level IRQ time accounting
Date: Wed, 29 Jul 2020 10:40:29 +0200	[thread overview]
Message-ID: <877dumbtoi.fsf@kurt> (raw)
In-Reply-To: <20200729033934.22349-1-alison.wang@nxp.com>

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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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  reply	other threads:[~2020-07-29  8:41 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-29  3:39 [RFC PATCH] arm64: defconfig: Disable fine-grained task level IRQ time accounting Alison Wang
2020-07-29  3:39 ` Alison Wang
2020-07-29  8:40 ` Kurt Kanzenbach [this message]
2020-07-29  8:40   ` Kurt Kanzenbach
2020-07-29  8:50   ` [EXT] " Alison Wang
2020-07-29  8:50     ` Alison Wang
2020-07-29  9:49   ` Vladimir Oltean
2020-07-29  9:49     ` Vladimir Oltean
2020-07-30  7:23     ` Kurt Kanzenbach
2020-07-30  7:23       ` Kurt Kanzenbach
2020-07-30  8:22       ` Vladimir Oltean
2020-07-30  8:22         ` Vladimir Oltean
2020-08-03  8:04         ` Kurt Kanzenbach
2020-08-03  8:04           ` Kurt Kanzenbach
2020-08-03  8:16           ` Vladimir Oltean
2020-08-03  8:16             ` Vladimir Oltean
2020-08-03  9:51             ` Robin Murphy
2020-08-03  9:51               ` Robin Murphy
2020-08-03 11:38               ` Vladimir Oltean
2020-08-03 11:38                 ` Vladimir Oltean
2020-08-03 11:48                 ` Valentin Schneider
2020-08-03 11:48                   ` Valentin Schneider
2020-08-03 13:24                   ` Marc Zyngier
2020-08-03 13:24                     ` Marc Zyngier
2020-08-03 10:02             ` Thomas Gleixner
2020-08-03 10:02               ` Thomas Gleixner
2020-08-03 10:49           ` Thomas Gleixner
2020-08-03 10:49             ` Thomas Gleixner
2020-08-03 11:41             ` Vladimir Oltean
2020-08-03 11:41               ` Vladimir Oltean
2020-08-03 15:13               ` Thomas Gleixner
2020-08-03 15:13                 ` Thomas Gleixner
2020-08-03 15:47                 ` Valentin Schneider
2020-08-03 15:47                   ` Valentin Schneider
2020-08-03 16:14                   ` Vladimir Oltean
2020-08-03 16:14                     ` Vladimir Oltean
2020-08-03 19:22                   ` Thomas Gleixner
2020-08-03 19:22                     ` Thomas Gleixner
2020-08-03 23:59                     ` Valentin Schneider
2020-08-03 23:59                       ` Valentin Schneider
2020-08-05  8:50                       ` Dietmar Eggemann
2020-08-05  8:50                         ` Dietmar Eggemann
2020-08-05 13:40                     ` peterz
2020-08-05 13:40                       ` peterz
2020-08-05 13:56                       ` Valentin Schneider
2020-08-05 13:56                         ` Valentin Schneider
2020-08-05 15:31                         ` peterz
2020-08-05 15:31                           ` peterz
2020-08-06  9:41                           ` Thomas Gleixner
2020-08-06  9:41                             ` Thomas Gleixner
2020-08-06 11:45                             ` peterz
2020-08-06 11:45                               ` peterz
2020-08-06 13:27                               ` Paul E. McKenney
2020-08-06 13:27                                 ` Paul E. McKenney
2020-08-06 19:03                                 ` Thomas Gleixner
2020-08-06 19:03                                   ` Thomas Gleixner
2020-08-06 20:39                                   ` Paul E. McKenney
2020-08-06 20:39                                     ` Paul E. McKenney
2020-08-06 18:58                               ` Thomas Gleixner
2020-08-06 18:58                                 ` Thomas Gleixner
2020-08-06  9:34                       ` Thomas Gleixner
2020-08-06  9:34                         ` Thomas Gleixner

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