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From: "Luck, Tony" <tony.luck@intel.com>
To: Borislav Petkov <bp@alien8.de>, Shiju Jose <shiju.jose@huawei.com>
Cc: "linux-edac@vger.kernel.org" <linux-edac@vger.kernel.org>,
	"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"rjw@rjwysocki.net" <rjw@rjwysocki.net>,
	"james.morse@arm.com" <james.morse@arm.com>,
	"lenb@kernel.org" <lenb@kernel.org>,
	"linuxarm@huawei.com" <linuxarm@huawei.com>
Subject: RE: [RFC PATCH 0/7] RAS/CEC: Extend CEC for errors count check on short time period
Date: Fri, 2 Oct 2020 16:04:11 +0000
Message-ID: <fd12bc3222784e06bb5b0ca1d1f1e1ae@intel.com> (raw)
In-Reply-To: <20201002124352.GC17436@zn.tnic>

> Because from my x86 CPUs limited experience, the cache arrays are mostly
> fine and errors reported there are not something that happens very
> frequently so we don't even need to collect and count those.

On Intel X86 we leave the counting and threshold decisions about cache
health to the hardware. When a cache reaches the limit, it logs a "yellow"
status instead of "green" in the machine check bank (error is still marked
as "corrected"). The mcelog(8) daemon may attempt to take CPUs that share
that cache offline.

See Intel SDM volume 3B "15.4 Enhanced Cache Error Reporting"

-Tony



      parent reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-02 12:22 Shiju Jose
2020-10-02 12:22 ` [RFC PATCH 1/7] RAS/CEC: Replace the macro PFN with ELEM_NO Shiju Jose
2020-10-02 12:22 ` [RFC PATCH 2/7] RAS/CEC: Replace pfns_poisoned with elems_poisoned Shiju Jose
2020-10-02 12:22 ` [RFC PATCH 3/7] RAS/CEC: Move X86 MCE specific code under CONFIG_X86_MCE Shiju Jose
2020-10-02 12:22 ` [RFC PATCH 4/7] RAS/CEC: Modify cec_mod_work() for common use Shiju Jose
2020-10-02 12:22 ` [RFC PATCH 5/7] RAS/CEC: Add support for errors count check on short time period Shiju Jose
2020-10-02 12:22 ` [RFC PATCH 6/7] RAS/CEC: Add CPU Correctable Error Collector to isolate an erroneous CPU core Shiju Jose
2020-10-02 12:22 ` [RFC PATCH 7/7] ACPI / APEI: Add reporting ARM64 CPU correctable errors to the CEC Shiju Jose
2020-10-02 12:43 ` [RFC PATCH 0/7] RAS/CEC: Extend CEC for errors count check on short time period Borislav Petkov
2020-10-02 15:38   ` Shiju Jose
2020-10-02 17:33     ` James Morse
2020-10-02 18:02       ` Borislav Petkov
2020-10-06 16:13       ` Shiju Jose
2020-10-07 16:45         ` James Morse
2020-10-02 16:04   ` Luck, Tony [this message]

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