[PATCH 2/2] x86/MCE: Add command line option to extend MCE Records pool

From: Naik, Avadhut
Date: Thu Feb 15 2024 - 15:16:14 EST

On 2/12/2024 03:32, Borislav Petkov wrote:
> On Mon, Feb 12, 2024 at 09:58:01AM +0100, Borislav Petkov wrote:
>> * Can you think of a slick deduplication scheme instead of blindly
>> raising the buffer size?
> And here's the simplest scheme: you don't extend the buffer. On
> overflow, you say "Buffer full, here's the MCE" and you dump the error
> long into dmesg. Problem solved.
Wouldn't this require logging in the #MC context?

We would know that the genpool is full in mce_gen_pool_add() which, I
think is executed in #MC context.

> A slicker deduplication scheme would be even better, tho. Maybe struct
> mce.count which gets incremented instead of adding the error record to
> the buffer again. And so on...

Avadhut Naik