Harry (Hyeonggon) Yoo
Posts
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130- 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
Harry (Hyeonggon) Yoo
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Harry (Hyeonggon) Yoo
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NEPŘÁTELSKÉ EMOCE 🇺🇦🇨🇿
lkundrak@metalhead.clubthen: "when I grow up I'll be programming computers"
now: "i vibepirated code i wrote"
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Harry (Hyeonggon) Yoo
hyeyoo
Edited 1 year ago
Recently started learning how memory cgroup in the Linux kernel works, so started writing articles about it. The first posting for my English blog vmscan.org!
A brief look at memory cgroup controller introduced in the Linux kernel v2.6.25.
https://vmscan.org/a-brief-look-at-memory-cgroup-controller-introduced-in-linux-kernel-v2625
A brief look at memory cgroup controller introduced in the Linux kernel v2.6.25.
https://vmscan.org/a-brief-look-at-memory-cgroup-controller-introduced-in-linux-kernel-v2625
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@krzk @ljs
Me crying ever since I randomly picked MM in college :'(
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Of course, just kidding—it just takes a significant amount of time to even start reviewing when you look at complex subsystems. But no matter how complex the subsystem you're looking at is, as long as your curiosity doesn’t stop and you keep spending time on it, you’ll eventually get there.
And yeah, being good at using Git is such an important skill in a project with a long history (and being able to find and read old mailing list threads too...)
Me crying ever since I randomly picked MM in college :'(
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Of course, just kidding—it just takes a significant amount of time to even start reviewing when you look at complex subsystems. But no matter how complex the subsystem you're looking at is, as long as your curiosity doesn’t stop and you keep spending time on it, you’ll eventually get there.
And yeah, being good at using Git is such an important skill in a project with a long history (and being able to find and read old mailing list threads too...)
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Harry (Hyeonggon) Yoo
hyeyoo
Edited 1 year ago
I have been spending seven hours every Saturday studying the Linux kernel with a study group for years. It's been fun, but over time, I started to feel like I wasn’t spending my time wisely. I have to accept the fact that I don’t have enough time to regularly look at anything outside of MM.
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Harry (Hyeonggon) Yoo
hyeyoo
Edited 1 year ago
I tried GPT-o3 (which uses 'advanced reasoning') to review slab patches to see if it works, and it generated many false comments. :P Less advanced than I expected.
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Harry (Hyeonggon) Yoo
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Lorenzo Stoakes
ljs@fosstodon.orgSpot on advice for any field.
For gym motivation is useless, it's all discipline, your test is on a day when you 100% hate it and want to do ANYTHING ELSE.
Music is my hobby but barely done any, because it is work really, a different kind, but if you want to get anywhere with it, you have to have the same discipline.
But I plan to apply the same gym-like discipline to that to get what I want out of it.
And of course this goes for kernel work too, obviously.
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WHAT'S WRONG WITH CODE FORMATTING IN blogger.com
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Harry (Hyeonggon) Yoo
hyeyoo
Edited 1 year ago
Blogging time after a long time.
/me again realizes that things not documented are quickly reclaimed from memory.
/me again realizes that things not documented are quickly reclaimed from memory.
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Jann Horn
jann@infosec.exchange
@ljs protip: much easier to rack up commits if you test your commits less - you can land them faster and you get to add fix commits on top
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Harry (Hyeonggon) Yoo
hyeyoo
Edited 1 year ago
Oh, I didn't know a CVE can be assigned to my bug fix without me requesting or realizing it. I thought (despite not being a security expert) it was not a 'fun' bug to exploit for attackers.
https://nvd.nist.gov/vuln/detail/CVE-2025-21860
https://nvd.nist.gov/vuln/detail/CVE-2025-21860
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