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Following
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A relatively new professional kernel hacker, born in August 6, 2000, and living in Korea (South!).

- Linux Kernel Developer @ Oracle (Linux Kernel MM) (2025.02 ~ Present)
- Reviewer for the Linux Slab & Reverse Mapping subsystem
- Former Intern @ NVIDIA, SK Hynix, Panmnesia (Security, MM and CXL)
- B.Sc. in Computer Science & Engineering, Chungnam National University (Class of 2025)

Opinions are my own.

My interests are:
Memory Management,
Computer Architecture,
Circuit Design,
Virtualization
hyeyoo

Harry (Hyeonggon) Yoo

https://2023.openinfradays.kr/schedule/day2

OCP APAC Techday is being held today in Seoul. Most of sessions are about CXL, AI, SSD. Still not sure if sessions are in english or korean.
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
Something strange is always found while running and experimenting new development kernels
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hyeyoo

Harry (Hyeonggon) Yoo

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hyeyoo

Harry (Hyeonggon) Yoo

The traditional Korean age system has been retired in South Korea, and now we use the international standard aging system.

I was 24 in the Korean age system, but now I'm legally 22 :P

https://www.bbc.com/news/world-asia-63903771
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hyeyoo

Harry (Hyeonggon) Yoo

still haven't recovered from jet lag (?) from the final exam period. today went to bed at 11 PM, woke up at 2 AM, and it's now 6 AM.
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
sometimes wanna stop posting normally and just shitpost all the time
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
started wondering where it's documented that x86 processors deal with the synonym problem, as they use VIPT data caches.

on ARMv8 processors there is an architectural guarantee that data caches acts as PIPT cache even if it's actually VIPT, so it's guaranteed not to suffer from D-cache aliasing.

I've been heard that there is a similar guarantee on x86 processors but haven't found any official references about it - errr, I guess it's time to read some part of the intel manual.

btw this is quite old but is very nice introduction:
https://www.linuxjournal.com/article/7105
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
I bought a new graphics card yesterday, and it came with a freebie. now my machine hangs whenever I boot a kernel with lockdep enabled.

Here is the link to the issue I posted on GitLab: https://gitlab.freedesktop.org/drm/nouveau/-/issues/237

BTW does DRM folks prefer using GitLab or the mailing list?
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hyeyoo

Harry (Hyeonggon) Yoo

I want NVIDIA's proprietary GPU drivers 🥲
nouveau does not support virtual GPUs...
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
I was refreshing my zsdesc patch series but encountered unrelated bug while testing (I bought new RAM so it must be software bug...)

Fortunately it was bisectable and I'm writing a report about it
Not sure if people will welcome an oops image instead of text format.
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hyeyoo

Harry (Hyeonggon) Yoo

a funny thing about memtest is that it can fail due to memory failure.
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
today I was hit by a kernel bug on the latest mm-unstable and so I was debugging it. but after a few kernel crashes even a normal kernel doesn't boot.... what's wrong with you :(

Not sure if it is a filesystem corruption caused by kernel bug, or they just did happen independently.
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
I have the last final exam today. haven't decided what to do during the summer vacation yet, but it will mostly involve learning new things and writing some kernel code.
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hyeyoo

Harry (Hyeonggon) Yoo

please end me or this semester
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hyeyoo

Harry (Hyeonggon) Yoo

the end of this semester is near,
can't wait for summer vacation
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hyeyoo

Harry (Hyeonggon) Yoo

@monsieuricon

https://lore.kernel.org/linux-mm
It seems to be no longer updated
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hyeyoo
repeated
ljs

Edited 2 years ago
Updated the progress page - dat flat line. Praying that nothing else interferes with progress going forward!

https://linuxmemory.org/progress
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hyeyoo
repeated
ljs

OK so that, minus descriptions of things like mprotect(), madvise(), mremap() and general review and cleanup is process memory done.

Been working on this part of the book (initially I thought it'd be 1 chapter, lol) for at least 6 months.

After a month of basically no book progress due to being away for lsf/mm and ill this is a great relief and keeps me on time after my last reschedule of targets.

Next: OOM killer chapter which, when done, will be released as a sample chapter.
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
I was unable to access my school's e-learning site this morning. Turns out I was expelled from school for unknown reason. I was panicking, but a school employee called me to say that there was a mistake while processing scholarship for school tuition and everything will be fine.
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hyeyoo

Harry (Hyeonggon) Yoo

off and off
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