Posts
473
Following
87
Followers
92
n00b Kernel Hacker
- Ex-Intern @ NVIDIA Korea (Security System Software) (2024.06-2024.11)
- Ex-Intern @ Panmneisa (CXL emulation stuff) (~2023.12)
- Undergraduate majoring CSE (estimated graduation: Feb. 2025)
- Working as reviewer at Linux Slab subsystem
- Born in August 6, 2000

Opinions are my own.

My interests are:
Memory Management,
Computer Architecture,
Circuit Design,
Virtualization
hyeyoo

Hyeonggon Yoo

poor photographer
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hyeyoo

Hyeonggon Yoo

Since when has kernel compilation required this much RAM? My laptop with 16GiB of RAM uses tens of GBs of swap space during linkage step
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hyeyoo

Hyeonggon Yoo

I was removing the CPU cooler when the CPU became stuck to it and came off together.

ahh why this happened to me :(

tried to straighten bent pins but
not sure if it will work again.
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hyeyoo

Hyeonggon Yoo

mm-unstable has never been kind to me.

https://lore.kernel.org/linux-mm/CAB=+i9Qbi7+o90Cd_ecd1TeaAYnWPcO-gNp7kzc95Pxecy0XTw@mail.gmail.com/T/#u
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hyeyoo

Hyeonggon Yoo

someone took a bite out of my slipper.
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hyeyoo
repeated
krzk

Krzysztof Kozlowski

Edited 1 year ago
It was great to see at the EOSS 2023 commitments from some ARM64 SoC manufacturers to upstreaming their SoCs. It was visible in the conference talks but also I got such clear vibes during the talks behind the scenes.
What was a bit missing is a story of Qualcomm which recently is heavily visible upstream - both directly and through the Qualcomm Landing Team in Linaro. November last year Qualcomm released its newest, shiniest mobile SoC: the Snapdragon 8 Gen 2 (SM8550).
And guess what happened? The next day you could find all the Linux kernel support for this new SoC on the mailing list. The newest SoC was released with upstream support at the same time. There is also story from @superna9999: https://www.linaro.org/blog/upstream-linux-support-now-available-for-the-the-qualcomm-snapdragon-8-gen-2-mobile-platform/
#eoss2023 #elce2023 #EmbeddedOSSummit
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hyeyoo

Hyeonggon Yoo

https://2023.openinfradays.kr/schedule/day2

OCP APAC Techday is being held today in Seoul. Most of sessions are about CXL, AI, SSD. Still not sure if sessions are in english or korean.
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hyeyoo

Hyeonggon Yoo

Edited 1 year ago
Something strange is always found while running and experimenting new development kernels
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hyeyoo

Hyeonggon Yoo

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hyeyoo

Hyeonggon Yoo

The traditional Korean age system has been retired in South Korea, and now we use the international standard aging system.

I was 24 in the Korean age system, but now I'm legally 22 :P

https://www.bbc.com/news/world-asia-63903771
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hyeyoo

Hyeonggon Yoo

still haven't recovered from jet lag (?) from the final exam period. today went to bed at 11 PM, woke up at 2 AM, and it's now 6 AM.
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hyeyoo

Hyeonggon Yoo

Edited 1 year ago
sometimes wanna stop posting normally and just shitpost all the time
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hyeyoo

Hyeonggon Yoo

Edited 1 year ago
started wondering where it's documented that x86 processors deal with the synonym problem, as they use VIPT data caches.

on ARMv8 processors there is an architectural guarantee that data caches acts as PIPT cache even if it's actually VIPT, so it's guaranteed not to suffer from D-cache aliasing.

I've been heard that there is a similar guarantee on x86 processors but haven't found any official references about it - errr, I guess it's time to read some part of the intel manual.

btw this is quite old but is very nice introduction:
https://www.linuxjournal.com/article/7105
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hyeyoo

Hyeonggon Yoo

Edited 1 year 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

Hyeonggon Yoo

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

Hyeonggon Yoo

Edited 1 year 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

Hyeonggon Yoo

a funny thing about memtest is that it can fail due to memory failure.
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hyeyoo

Hyeonggon Yoo

Edited 1 year 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

Hyeonggon Yoo

Edited 1 year 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

Hyeonggon Yoo

please end me or this semester
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