Posts
564
Following
103
Followers
116
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

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
1
1
1
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?
0
0
2
hyeyoo

Harry (Hyeonggon) Yoo

I want NVIDIA's proprietary GPU drivers 🥲
nouveau does not support virtual GPUs...
0
0
0
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.
0
0
1
hyeyoo

Harry (Hyeonggon) Yoo

a funny thing about memtest is that it can fail due to memory failure.
0
0
2
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.
1
0
2
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.
1
0
3
hyeyoo

Harry (Hyeonggon) Yoo

please end me or this semester
2
0
3
hyeyoo

Harry (Hyeonggon) Yoo

the end of this semester is near,
can't wait for summer vacation
0
0
1
hyeyoo

Harry (Hyeonggon) Yoo

@monsieuricon

https://lore.kernel.org/linux-mm
It seems to be no longer updated
0
0
1
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
0
3
4
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.
2
1
6
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.
1
0
2
hyeyoo

Harry (Hyeonggon) Yoo

off and off
0
0
3
hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
looks like @ljs 's changes to GUP broke my out-of-tree virtualbox driver. out-of-tree drivers suck :P
2
0
3
hyeyoo

Harry (Hyeonggon) Yoo

Starting to like Joan's drawings more
0
0
2
hyeyoo

Harry (Hyeonggon) Yoo

TIL: NUMA configuration and distance matrix are parsed from device trees, ACPI, or dummy configuration is used.
0
0
3
hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
Videos of LSFMMBPF Summit / OSSNA sessions are now available on Youtube:


https://youtube.com/playlist?list=PLbzoR-pLrL6rlmdpJ3-oMgU_zxc1wAhjS

https://youtube.com/playlist?list=PLbzoR-pLrL6p445pIqTLUIzsceFp_puSy
0
4
9
hyeyoo

Harry (Hyeonggon) Yoo

South Korea's space rocket Nuri launched

https://en.yna.co.kr/view/AEN20230524009656320
1
0
1
hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
seems I made a mistake,
want to be more wise and strong!
1
0
0
Show older
About social.kernel.org

Terms of service

  1. Please do not use this service in violation of the Linux Kernel Code of Conduct. Doing so will result in your account suspension with the referral of the matter to the CoC committee.

  2. "Repeating"/"boosting" someone else's status on this platform will be treated as endorsement and will fall under rule #1.

  3. You are encouraged to use this platform to promote your work on the Linux Kernel, but there is no restriction on permitted topics (with the exception of anything covered by #1 above).

  4. There is no requirement to post in English, but it should be considered the primary language of communication on this platform.

Privacy notice

The admins of this service have access to all posted statuses. They aren't looking, but if it's something they shouldn't know about, then you should not post it on this platform.

Please see the Linux Foundation Privacy Policy, which applies to this platform as well.

Getting your own account

If you would like an account on this instance, please check that the following applies to you:

  • You are listed in MAINTAINERS or CREDITS

  • OR: You have a kernel.org account or email address

  • OR: You have a long and established history of involvement with the Linux Kernel

If the above is true and you agree with the Terms of Service and Privacy Notice listed above, please use these instructions to request an account: