Posts
529
Following
99
Followers
116
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 & 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
hyeyoo

Harry (Hyeonggon) Yoo

Reply to @ljs
@ljs @kernellogger @sj

LOL what
you mean /proc/sys/vm/drop_caches?
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @ljs
@ljs @kernellogger @sj

Ah, I added sj because IIRC he's planning implement an auto tuner for DAMON parameters - no one should be like "bpftune can tune everything and make more parameters"

it would have been horrible if i.e. active/inactive list balancing was implemented as a kernel parameter :P
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @ljs
@ljs @kernellogger @sj

That's a perspective I didn't have, and it makes sense. So, it's like performing CPR on this messed-up situation?
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to
Edited 2 years ago
@kernellogger

@sj you might be interested in adapting DAMON parameters?
btw I wonder how broad range of parameters could be covered
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to
@kernellogger WOW that is amazing work!
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @vbabka
Edited 2 years ago
@vbabka @ljs would running mm-stable make it stable again? 🥲 I didn't threw it away yet
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @ljs
@ljs please do the same to overgrown MM code
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to
@cwayne @ljs is it better than normal tablets (like ipad)?
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
I bought a new graphics card yesterday, and it came with a freebie. now my machine hangs whenever I boot a kernel with lockdep enabled.

Here is the link to the issue I posted on GitLab: https://gitlab.freedesktop.org/drm/nouveau/-/issues/237

BTW does DRM folks prefer using GitLab or the mailing list?
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hyeyoo

Harry (Hyeonggon) Yoo

I want NVIDIA's proprietary GPU drivers 🥲
nouveau does not support virtual GPUs...
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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

Reply to @hyeyoo
@ljs gotcha!
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @hyeyoo
@ljs hmm I tried to boot using two different bootable USBs but both says something has been corrupted. It makes me think the kernel may be innocent
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @ljs
@ljs directly on host, it was wild memory access according to KASAN.
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @ljs
Edited 2 years ago
@ljs sometimes during kernel compilation, sometimes while shutting down the machine for rebooting...
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @vbabka
@vbabka thanks, finally the semester is over!
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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

Reply to @ljs
Edited 2 years ago
@ljs @lkundrak

Not sure if they are something like this
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