Re: [PATCH v2 0/2] x86/mm: support memory-failure on 32-bits with SPARSEMEM

David Hildenbrand (Red Hat)
2025-11-04T09:33:47Z

On 04.11.25 08:23, Xie Yuanbin wrote:
> Memory bit flips are among the most common hardware errors in the server
> and embedded fields, many hardware components have memory verification
> mechanisms, for example ECC. When an error is detected, some hardware or
> architectures report the information to software (OS/BIOS), for example,
> the MCE (Machine Check Exception) on x86.
>
> Common errors include CE (Correctable Errors) and UE (Uncorrectable
> Errors). When the kernel receives memory error information, if it has the
> memory-failure feature, it can better handle memory errors without reboot.
> For example, kernel can attempt to offline the affected memory by
> migrating it or killing the process. Therefore, this feature is widely
> used in servers and embedded fields.

This is a pretty generic description of MCEs.

I think what we are missing is: who runs 32bit OSes on MCE-capable
hardware (or VMs?) and needs this to work.

What's the use case?

--
Cheers

David