Bug#1050940: linux: Enable Correctable Errors Collector RAS_CEC feature

[Miguel Bernal Marin]

Source: linux
Version: 6.5~rc7-1~exp1
Severity: wishlist
Tags: patch
X-Debbugs-Cc: miguel.be...@linux.intel.com, jair.g...@linux.intel.com

Dear Maintainer,

Please enable the Reliability, Availability and Serviceability (RAS)
Correctable Errors Collector (RAS_CEC) feature on arch amd64/x86_64,
on Debian Trixie.

RAS_CEC introduce a simple data structure for collecting correctable
errors along with accessors.

This is a small cache which collects correctable memory errors per 4K
page PFN and counts their repeated occurrence. Once the counter for a
PFN overflows, we try to soft-offline that page as we take it to mean
that it has reached a relatively high error count and would probably
be best if we don't use it anymore.

The error decoding is done with the decoding chain now and
mce_first_notifier() gets to see the error first and the CEC decides
whether to log it and then the rest of the chain doesn't hear about it -
basically the main reason for the CE collector - or to continue running
the notifiers.

When the CEC hits the action threshold, it will try to soft-offine the
page containing the ECC and then the whole decoding chain gets to see
the error.

To disable the Correctable Errors Collector, a kernel parameter is used:
> ras=cec_disable

A MR was created with this proposal at:

https://salsa.debian.org/kernel-team/linux/-/merge_requests/827

Thanks,
Miguel Bernal Marin

[Debian Bug Tracking System]

Your message dated Sun, 03 Sep 2023 11:40:55 +0000
with message-id <E1qclTL-...@fasolo.debian.org>
and subject line Bug#1050940: fixed in linux 6.5.1-1~exp1
has caused the Debian Bug report #1050940,
regarding linux: Enable Correctable Errors Collector RAS_CEC feature
to be marked as done.

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1050940: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1050940
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