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From:   Alison Wang <alison.wang@nxp.com>
To:     catalin.marinas@arm.com, will@kernel.org,
        kurt.kanzenbach@linutronix.de, 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
Subject: [RFC PATCH] arm64: defconfig: Disable fine-grained task level IRQ time accounting
Date:   Wed, 29 Jul 2020 11:39:34 +0800
Message-Id: <20200729033934.22349-1-alison.wang@nxp.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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.

Signed-off-by: Alison Wang <alison.wang@nxp.com>
---
 arch/arm64/configs/defconfig | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index e0f33826819f..ff1c11d8b10b 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -4,7 +4,6 @@ CONFIG_AUDIT=y
 CONFIG_NO_HZ_IDLE=y
 CONFIG_HIGH_RES_TIMERS=y
 CONFIG_PREEMPT=y
-CONFIG_IRQ_TIME_ACCOUNTING=y
 CONFIG_BSD_PROCESS_ACCT=y
 CONFIG_BSD_PROCESS_ACCT_V3=y
 CONFIG_TASK_XACCT=y
-- 
2.17.1