Posts
517
Following
97
Followers
114
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 @hyeyoo
Remote node access latency is approximately 40% higher than that of the local node, and the throughput for remote nodes is only half of that for local nodes.
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
I've just built my first 2 socket server (36C/72T, DDR4 256GB ECC/REG RAM) for experimenting with NUMA.
It's an old xeon server (Broadwell), but enough to play with!
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @hyeyoo
Edited 2 years ago
The bad part is that the pay is poor because it's a "field exercise" :/
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hyeyoo

Harry (Hyeonggon) Yoo

Sometimes my schedule goes out of control, and I find myself buried in the work I started. It can be overwhelming, and this is one of those moments.

However, there is some good news: it's likely that I will be participating in a field exercise program next semester at a startup that designs CXL devices.

It's a very nice opportunity, but at the same time, it's a pity that I'll be missing some classes!
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @vbabka
@vbabka what do you mean?
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hyeyoo

Harry (Hyeonggon) Yoo

How am I supposed to take it out
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hyeyoo

Harry (Hyeonggon) Yoo

poor photographer
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @vbabka
@vbabka

hahahahaaaa it wooorks
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @vbabka
@vbabka @sevan
No LTO (there is no GCC LTO yet afaik too),
and I guess just building debug kernel eats tons of memory

BTW GCC LTO has been maintained out of tree for a long time, but still no mainline support....
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @conor
@conor Yay! That's very welcome news!
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hyeyoo

Harry (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

Harry (Hyeonggon) Yoo

Reply to @conor
@conor it was totally unexpected accident, a lesson learned worth $500 🥲
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hyeyoo

Harry (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

Harry (Hyeonggon) Yoo

Reply to @ljs
@ljs I'm really sorry to hear that. please hold on and stay strong!
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to
@cwayne @vbabka

most of my friends use it to share everyday life
(and some of them literally post every single event in their life)
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hyeyoo

Harry (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

Harry (Hyeonggon) Yoo

Reply to
@cwayne @vbabka
why not instagram?
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @vbabka
@vbabka @ljs possibly! it makes perfect sense.
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hyeyoo

Harry (Hyeonggon) Yoo

someone took a bite out of my slipper.
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @vbabka
Edited 2 years ago
@vbabka @larsmb threads are inherently toxic to brain as you need to take care about concurrency
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