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A professional kernel hacker, born in August 6, 2000, and living in Korea (the South one!).

- Linux Kernel Developer @ Oracle (Linux Kernel MM) (2025.02 ~ Present)
- A slab subsystem co-maintainer and a reviewer for the 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
@vbabka it might not be the slipperiness, it might be the BPF
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Vlastimil Babka πŸ‡¨πŸ‡ΏπŸ‡ͺπŸ‡ΊπŸ‡ΊπŸ‡¦

Finally found a comic about myself!

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Harry (Hyeonggon) Yoo

Edited 3 days ago
@ljs @lkundrak @liskin @ptesarik @vbabka

"satanic" because it lives in people's minds without actual physical existence!
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@vbabka @ljs @lkundrak @ptesarik @liskin

he's writing an AI dystopian novel
because he can't be bothered to write more MM books
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Everyone wants to be tall until they take a flight

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Kernel memory management microconf at LPC 2026 is announced with the opening of CFP: https://lore.kernel.org/e3dc73df-0032-4e71-ab80-21b29c6efb46@kernel.org

#linuxplumbers
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@ljs they are not shy!
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@ljs the sun is too shy to show up, as usual
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Vlastimil Babka πŸ‡¨πŸ‡ΏπŸ‡ͺπŸ‡ΊπŸ‡ΊπŸ‡¦

Me: as suggested by willy, adopt an unusual term in order to avoid an established term with weapons connotation.

Youtube shorts algo: haha, look at this, you fool.

(~40 seconds in) - https://www.youtube.com/shorts/UkNnZgBnyqQ

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After Gitlab's recent announcement I am strongly considering migrating Redox OS to Forgejo, a truly open source community maintained project.

https://about.gitlab.com/blog/gitlab-act-2/

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Harry (Hyeonggon) Yoo

Edited 14 days ago
@haoli I guess jail cells are free though... and more convenient than economy seats with free meals
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@haoli which Korea did you mean??
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@lwn DAMON LSF/MM/BPF discussions covered by LWN! It was a productive and fantastic time! Thanks again to the conference organizers, and huge thanks to LWN for covering the discussions!

#linux #kernel #damon

RE: https://fedi.lwn.net/@lwn/116539161262678640
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Bad things can happen if you leak pointers out of RCU read-side critical sections. What can you do about it?
https://people.kernel.org/paulmck/stupid-rcu-tricks-detecting-pointer-leaks
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@Aissen
the problem regarding the broken aging system is that we fixed it legally, but people still use it everyday life. now even more confusion!

"how old are you?", "pardon, what do you mean by how old I am?"
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@Aissen

OMG it's so confusing!
the korean aging system is not the only thing that's broken, cheers
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Harry (Hyeonggon) Yoo

Edited 20 days ago
@Aissen

But I'd bet anyone who doesn't do programing prefer to count from 1 anyway.

And the reason why you count from the first floor is because you don't really think of ground floor as a floor.... the first floor is a proper floor! (so it's still counting from 1)
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@Aissen

OMG WHAAAAAAAT

I was going to say "NO IT'S NOT" but you are right. I don't know why we do this. I grew up with it and then everybody else doesn't use it :P
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@ljs now time to fly back and sleep like a koala or panda
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Hoshino Lina (ζ˜ŸδΉƒγƒͺγƒŠ) 🩡 3D Yuri Wedding 2026!!!

Edited 20 days ago

Typical ML argument: "If I can read something legally, why can't I train an LLM on it?"

Humans are capable of reading things and later writing a similar thing that is still a copyright violation. If I go and write a book that follows the plot line of Star Wars, that's still a copyright violation, even if no text is literally the same. If I play the melody to a song on my piano and release it without the appropriate mechanical cover license, that's also a copyright violation.

The reason this does not happen often is that, as humans, we are aware that that's plagiarism and there are rules. Sometimes it happens by accident, and people still get sued and lose.

LLMs have no such awareness and routinely output things which are blatant copyright violations when appropriately prompted. That means the model weights encode that work, and therefore, are themselves a derivative work.

Your brain encodes a massive amount of copyrighted information. You are not a walking copyright violation because humans aren't data, can't be copied and distributed en masse, have human rights, etc. This is why "mind reading machines" are a classic dystopian plot point (monetizing your thoughts etc).

An LLM is not a human, does not have human rights, nor human privileges. It is data, and if it encodes copyrighted information, that's a derivative work. If you aren't following the license of the training data, that's a copyright violation.

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