linux-kernel - Re: [RFC PATCH v3 11/21] x86/watchdog/hardlockup: Add an HPET-based hardlockup detector

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Message-ID: <62576937-50fc-fded-784b-d691e455dfc1@infradead.org>
Date:   Tue, 14 May 2019 07:26:58 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...e.de>
Cc:     Ashok Raj <ashok.raj@...el.com>, Joerg Roedel <joro@...tes.org>,
        Andi Kleen <andi.kleen@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        Ricardo Neri <ricardo.neri@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>, Tony Luck <tony.luck@...el.com>,
        Clemens Ladisch <clemens@...isch.de>,
        Arnd Bergmann <arnd@...db.de>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Nayna Jain <nayna@...ux.ibm.com>,
        Stephane Eranian <eranian@...gle.com>,
        Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Subject: Re: [RFC PATCH v3 11/21] x86/watchdog/hardlockup: Add an HPET-based
 hardlockup detector

On 5/14/19 7:02 AM, Ricardo Neri wrote:
> diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
> index 15d0fbe27872..376a5db81aec 100644
> --- a/arch/x86/Kconfig.debug
> +++ b/arch/x86/Kconfig.debug
> @@ -169,6 +169,17 @@ config IOMMU_LEAK
>  config HAVE_MMIOTRACE_SUPPORT
>  	def_bool y
>  
> +config X86_HARDLOCKUP_DETECTOR_HPET
> +	bool "Use HPET Timer for Hard Lockup Detection"
> +	select SOFTLOCKUP_DETECTOR
> +	select HARDLOCKUP_DETECTOR
> +	select HARDLOCKUP_DETECTOR_CORE
> +	depends on HPET_TIMER && HPET && X86_64
> +	help
> +	  Say y to enable a hardlockup detector that is driven by an High-

	                                                       by a

> +	  Precision Event Timer. This option is helpful to not use counters
> +	  from the Performance Monitoring Unit to drive the detector.
> +
>  config X86_DECODER_SELFTEST
>  	bool "x86 instruction decoder selftest"
>  	depends on DEBUG_KERNEL && KPROBES


-- 
~Randy