Posts
491
Following
97
Followers
112
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 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
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It seems to be no longer updated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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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
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hyeyoo

Harry (Hyeonggon) Yoo

Starting to like Joan's drawings more
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hyeyoo

Harry (Hyeonggon) Yoo

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

Harry (Hyeonggon) Yoo

South Korea's space rocket Nuri launched

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

Harry (Hyeonggon) Yoo

Edited 2 years ago
seems I made a mistake,
want to be more wise and strong!
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hyeyoo
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vbabka

SLAB deprecation posted! So many defconfigs...
https://lore.kernel.org/all/20230523091139.21449-1-vbabka@suse.cz/
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
[Intel Publishes "X86-S" Specification For 64-bit Only Architecture]( https://www.phoronix.com/news/Intel-X86-S-64-bit-Only )

Not booting from real mode (-> protected mode -> long mode) anymore.
Still seems to support running 32 bit applications on 64 bit kernel.

Wait, who wants to run 32 bit kernel on 64 bit processors?
How much silicon is saved with this new ISA?
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hyeyoo

Harry (Hyeonggon) Yoo

My dream tonight was really strange: I was kidnapped and forced to do kernel work, and then I was sold to a software company.
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