Re: [PATCH v6 0/2] Memory poison recovery in khugepaged collapsing

[Jiaqi Yan <jiaqiyan@google.com>]

Thanks for ccing Oscar, Andrew.

After getting this patch into our internal production environment, I
recently found a regression bug introduced by my commit a0157a2c735b
("mm/khugepaged: recover from poisoned file-backed memory").
Given it is only in mm-unstable, I wonder should I put out a v7 with
the fix, or should I make it a new and separate commit?
Sorry for the bug.


On Mon, Nov 7, 2022 at 12:53 PM Andrew Morton <akpm@linux-foundation.org> wrote:
>
> On Sun,  6 Nov 2022 18:53:57 -0800 Jiaqi Yan <jiaqiyan@google.com> wrote:
>
> > Memory DIMMs are subject to multi-bit flips, i.e. memory errors.
> > As memory size and density increase, the chances of and number of
> > memory errors increase. The increasing size and density of server
> > RAM in the data center and cloud have shown increased uncorrectable
> > memory errors. There are already mechanisms in the kernel to recover
> > from uncorrectable memory errors. This series of patches provides
> > the recovery mechanism for the particular kernel agent khugepaged
> > when it collapses memory pages.
>
> Thanks, I'll toss v6 into mm-unstable for some testing, pending further review.
>
> When resending a patchset, please try to also cc the people who have
> commented on previous versions.
>