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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
@ljs @vbabka @david @sj

Money doesn't matter - rich people
Physical beauty doesn't matter - attractive people
Kernel development statistics don't matter - Lorenzo Stoakes
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@ljs @sj @david @vbabka

omg I am a hardworking Korean but can't beat these guys
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@sj does the cat review your patches and emails before sending them, or is it the other way around?
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Seems we have confirmation this 'Josh Law' guy is an openclaw bot - https://lore.kernel.org/linux-mm/ae7dc7de-966e-4e04-bb55-318d97c61909@lucifer.local/

As I said in https://lore.kernel.org/lkml/1e982055-47c2-43d1-a919-93b3e59f2ed0@lucifer.local/ :

"I feel that LLMs are not like any other tools but in fact represent
something entirely new in that you can end-to-end send patches using this
tooling with little to no knowledge and the asymmetry between maintainer
resource and the possible slurry of submissions that might arise makes this
very significantly different.

I know Linus had the cute interpretation of it 'just being another tool'
but never before have people been able to do this."

Of course Linus slapped me down with his 'just more tooling' take which was gleefully reported on by the press (e.g. https://www.theregister.com/2026/01/08/linus_versus_llms_ai_slop_docs/ )

I'll let you decide whether these are 'just like any other tool' or not.

BTW 'Josh Law' more than doubled his sent emails in a week or 2 to 370+.

Of course I'm sure coccinelle has that feature and I just wasn't aware 👀

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@vbabka @haoli @oleksandr

Olaf as a service vs. @oleksandr as a service
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Edited 1 month ago

Looks like exactly the kind of AI abuse I feared could happen in the kernel is happening.

Now you can see why I pushed back so hard on the automated tooling docs to make it clear we should reject this crap out of hand, being attacked in various publications online for saying so.

Wonder if they will talk about this or?

And yes I told you so.

https://lore.kernel.org/linux-mm/cbd0aafa-bd45-4f4d-a2dd-440473657dba@lucifer.local/

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@ljs

Good morning! The weather's nice today, just like how good you're fee... oh wait, sorry. You live in the UK!
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@mathieu


> While I've been thinking rationally about this, I've a feeling a large part of our peers haven't

... that's truely concerning, yeah. It'll take some time (hopefully until it's too late) for people to realize.

> My take is that the tech is "good enough" (see latest claude etc)

Yeah, it's quite good! the only problem is...

> that people will keep hyping it just enough that it will justify printing more money for it.

...that it doesn't seem like the industry is making a reasonable investment or carefully applying the tech to reality.

> In the long run will we see the harsh reality of this (hard to fix bugs etc)? Sure! Will it be too late ? Pretty sure that's also a yes.

Sadly yes :(

> Anyway sorry my reasoning is a bit all over the place, it's just confusing times

Don't worry. It's confusing time for everybody...
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Harry (Hyeonggon) Yoo

Edited 1 month ago
@mathieu

How will it succeed (in an economically viable sense) if the tech isn't great? The bubble will burst at some point anyway if the tech can't back up the expectations.

I feel like people have stopped thinking rationally (cuz I don't see any clue or potential that the machine is going to take over, at least for now) and are just going wild & pouring an insane amount of money into it...

They'll have to face the consequences eventually, but what worries me is that it might affect the people around me (who aren't doing AI stuff).

+1 for questioning my own sanity.... you're not alone! hehe
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Harry (Hyeonggon) Yoo

Edited 1 month ago
@mathieu

seems like it's just human nature to feel enormous excitement and worry at the same time whenever a fancy new tech comes out (only to realize later it wasn't as good or bad as expected)

/me stares at his stock account and wondering when to pull out
(but yeah it's not just about the stock market)
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I can't wait for either the bubble to burst or the machine taking over. This inbetween is such a sad pathetic state.

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Compressed swap is a common lever to improve memory density, but there's a lot of confusion about how to best use it out there, and many people treat zram/zswap as two flavours of the same thing when they are really far more nuanced.

So what works, what doesn't, and why? In this article I go over the tradeoffs, the work we are doing upstream, and a little about what the future looks like. I am, as always, happy to answer questions :-)

https://chrisdown.name/2026/03/24/zswap-vs-zram-when-to-use-what.html

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@vbabka @kernellogger That's the beauty (and also ugliness) of vagueness; it can get specific in any direction :)
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@kernellogger @vbabka
A vague toot from a colleague spreading like a plague from Prague to Hague!
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Harry (Hyeonggon) Yoo

Edited 1 month ago
@ljs

that's awful indeed.

the maintainer should transfer some power and responsibilities (ok, this is already...) to rightful folks and trust/respect them :/
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@ljs There's nothing more frustrating than something that doesn't change no matter how hard you try, especially when it's something you're really passionate about and care about deeply.

More than anything, I just wish you wouldn't burn yourself out and would take a little rest :'(

I really appreciate and keep being impressed by what you and David have been doing, but at the same time I can't help worrying that you're taking on too much of a burden...
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@vbabka @monsieuricon hehe, I have been doing all the churn manually every time I send a patchset :P
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@oleksandr @vbabka yeah absolutely, the feeling when...
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Harry (Hyeonggon) Yoo

Oh, why didn't I learn how to use lei sooner?
(going to say the same thing for b4, I guess)
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