Posts
490
Following
96
Followers
106
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 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

Unintentionally messed up @vbabka 's tree tree by doing last-minute reviews :(
1
0
2
@vbabka @ljs @ptesarik Yeah I totally get it :) I was just practicing shitposting
1
0
3
@ptesarik @ljs @vbabka
I'm not even qualified to be a shitpost noob? Oh man...
1
0
3
@ptesarik @ljs
I'm here for you :) still learning how to shitpost from them as well
1
0
3

K. Ryabitsev 🍁

x.x.x.x - - [10/Nov/2024:00:02:37 +0000] "GET / HTTP/1.1" 301 162 "-" "okhttp/4.9.0"

You know what’s interesting about this log line? It repeats 56,686,963 times in www.kernel.org logs for yesterday, across 4 nodes. That’s about 700 times a second, and this has been going on for months.

These requests aren’t intentionally malicious – they issue a simple GET /, receive their 301 redirect, and terminate the connection. From what I can tell, this is some kind of appliance or software installed on mobile clients that uses “can I reach www.kernel.org” as a network test.

This wouldn’t be that big of a deal – a single plaintext “GET /“ that triggers an immediate 301 is very cheap for us to generate, but the number of these requests has been steadily growing.

If you have any idea what this is and how to make it stop, please reach out?

39
469
300
When you CoW a huge page but @vbabka 's written buggy code so you end up with a tiny one
1
2
6

Harry (Hyeonggon) Yoo

Edited 6 months ago
@vbabka @brauner

haha but most people won't focus on how specific/synthetic it is. The number just kinda attracts attention.

I still think it's really hard to demonstrate how a patch will affect realistic scenarios or how much of a clear win it is in most situations... as we all have limited resources to evaluate them.
0
0
2
@wagi @kernellogger @lkundrak @ljs @vbabka

it's very compact OS(?)
1
0
2
@wagi @ljs @kernellogger @lkundrak @vbabka

These fans are here to please you when you feel lonely... oh.

source: onlyfans by CERN
https://web.archive.org/web/20231010131612/https://onlyfans.web.cern.ch/
0
0
5

Harry (Hyeonggon) Yoo

Edited 6 months ago
@lkundrak

be careful, your brain is being reclaimed by reading it
1
0
3
@lkundrak
oh that sounds a bit sexually provocative
1
0
0

Harry (Hyeonggon) Yoo

Edited 6 months ago
@lkundrak

"Linux MM in a nutshell"

🍷
0
0
2
@lkundrak
It probably won't fit there :(
It'd be very thick.
3
0
3

@ljs In my experience, my eyes are keenest directly after sending a patch.

0
2
3
Achieve 3888.9% performance improvement thanks to this one weird trick https://lore.kernel.org/all/202411072132.a8d2cf0f-oliver.sang@intel.com/
3
5
10

Harry (Hyeonggon) Yoo

Edited 6 months ago
@ljs @blainsmith That's why you began lifting weights after you started writing the book? ...to take care your mental health
1
0
2
@ljs @blainsmith

Oh how often/long do you lift? I'm more of a hobbyist myself...
1
0
2
@blainsmith I work out to stay in the tech industry longer
1
0
3
Show older