Posts
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Following
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Followers
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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 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
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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hyeyoo

Harry (Hyeonggon) Yoo

@sj @vbabka @cwayne

Hi Chris
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hyeyoo

Harry (Hyeonggon) Yoo

Now I have my key uploaded to keys.openpgp.org:

https://keys.openpgp.org/search?q=42.hyeyoo%40gmail.com
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hyeyoo

Harry (Hyeonggon) Yoo

going to seattle (and then vancouver),
everything is good but WIFI speed is 1Mbps
(21.95$)
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hyeyoo
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vbabka

I've been never... brave enough for doing slides on the plane on the way to conference, so here we go, ahead of the travel to Vancouver: https://ossna2023.sched.com/event/2b02a776f0e49c787af92b1d1847622e
Hopefully I'll be just adding some last minute developments from the respective LSF/MM session to report in my LinuxCon track talk. And hopefully those developments will include "we agreed to remove SLAB, nobody objected" ;)
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hyeyoo

Harry (Hyeonggon) Yoo

https://lwn.net/SubscriberLink/930667/02592091cb9310b6

@ljs on the news!
I could see his pain while reading it
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hyeyoo

Harry (Hyeonggon) Yoo

Beef
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
Stayed up all night preparing for midterm exam.
Didn't know getting a degree is this hard.
Just let me graduate please! :P
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hyeyoo

Harry (Hyeonggon) Yoo

edge detection of tux the mascot
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