linux-kernel - Re: [RFC PATCH] x86/mce: Provide sysfs interface to show CMCI storm state

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Message-ID: <4B422201-A96F-4EB7-A42F-9A1BF89D4794@amazon.com>
Date:   Thu, 3 Jun 2021 22:48:12 +0000
From:   "BeSerra, Christopher" <beserra@...zon.com>
To:     "Luck, Tony" <tony.luck@...el.com>, Borislav Petkov <bp@...en8.de>
CC:     "x86@...nel.org" <x86@...nel.org>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] x86/mce: Provide sysfs interface to show CMCI storm state

There are corner cases where the CE count is 0 when a storm occurs.  EDAC completely missed logging CEs.

On 6/1/21, 1:41 PM, "Luck, Tony" <tony.luck@...el.com> wrote:

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    > But I'm unclear as to what this whole use case is. The very first
    > "Scripts that process error logs" already sounds like a bad idea - I'd
    > expect userspace consumers to open the trace_mce_record() and get the
    > MCE records from there. And in that case CMCI storm shouldn't matter...

    I think the problem is knowing that many errors are being missed because
    of the switch to poll mode. All methods to track errors, including the trace_mce_record()
    technique are equally affected by missed errors.

    But maybe Chris can better describe what the problem is ...

    -Tony