Posts
476
Following
91
Followers
93
n00b Kernel Hacker
- Linux Kernel Developer @ Oracle (Linux Kernel MM) (2025.02 ~ Present)
- Ex-Intern @ SK Hynix (Linux Kernel MM) (2024.12 ~ 2025.01)
- Ex-Intern @ NVIDIA Korea (Security System Software) (2024.06 ~ 2024.11)
- Ex-Intern @ Panmneisa (CXL emulation stuff) (2023.09 ~ 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

Reply to @lkundrak@octodon.social
Edited 1 year ago
@lkundrak @liskin @monsieuricon @vbabka

(confession: I was torturing memory bus by fully cloning via virtio-fs (locally) instead of git.kernel{,testing}.org, before I learned how to do shallow clones and use reference git repositories)
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hyeyoo

Hyeonggon Yoo

Reply to @hyeyoo
@liskin @lkundrak @monsieuricon @vbabka
wait this is not generated for all git.kernel.org repos
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hyeyoo

Hyeonggon Yoo

Reply to @hyeyoo
@lkundrak @liskin @monsieuricon @vbabka

https://www.kernel.org/cloning-linux-from-a-bundle.html

Oh, this is cool
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hyeyoo

Hyeonggon Yoo

Reply to @lkundrak@octodon.social
@lkundrak @vbabka @liskin @monsieuricon
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hyeyoo

Hyeonggon Yoo

Reply to @vbabka
@vbabka @liskin @monsieuricon

that's why git.kerneltesting.org is there ;)
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hyeyoo

Hyeonggon Yoo

Reply to @vbabka
re: too spicy for hammer smashed?
Show content
@vbabka @ljs @lkundrak

I like how you all are #being #kind to each other
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hyeyoo

Hyeonggon Yoo

Reply to @lkundrak@octodon.social
@lkundrak @liskin @vbabka
but even removing code adds the repository size lol
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hyeyoo

Hyeonggon Yoo

Reply to @hyeyoo
@liskin And linux git repository is huge ;(
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hyeyoo

Hyeonggon Yoo

Reply to @liskin@genserver.social
@liskin
Except kernel devs - kernel testing is too niche that modern CI services doesn't work well with it 😢
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hyeyoo

Hyeonggon Yoo

Reply to @vbabka
@vbabka @ljs oh, andrew was the first one with that policy?
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hyeyoo

Hyeonggon Yoo

Reply to @vbabka
@vbabka tbh I'm not sure, but at least git repos that are regularly merged to linux-next shouldn't use that policy ;)

Anyway the policy seems to work quite well!

https://lore.kernel.org/linux-mm/CAB=+i9Sw1YSdUKrjygA5cOsVjQMVmS8-KJ+ku4AG9Fw_2guENQ@mail.gmail.com/T/#t
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hyeyoo

Hyeonggon Yoo

Hmm when running builds and testcases, my machine sometimes becomes very unstable and stuck for a while.

this causes some build/test failures because git clone or job submit timeouts are exceeded.

it's very annoying and I need to fix, but I couldn't find out why. I need to setup a monitoring system...
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hyeyoo

Hyeonggon Yoo

Reply to @lkundrak@octodon.social
@lkundrak did it bother you all to time?
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hyeyoo

Hyeonggon Yoo

Reply to @vbabka
Edited 1 year ago
@vbabka

https://git.kerneltesting.org/slab-experimental

Here it is!

This is the first kernel repository that adopts "merge first and then drop if it's broken" policy ;)
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hyeyoo

Hyeonggon Yoo

Dealing with large git repositories in Jenkins

https://www.jenkins.io/files/2016/jenkins-world/large-git-repos.pdf

https://randyfay.com/content/reference-cache-repositories-speed-clones-git-clone-reference
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hyeyoo

Hyeonggon Yoo

first time using GCOV, it's pretty nice.
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hyeyoo

Hyeonggon Yoo

Reply to @ljs
@ljs @vbabka I truly support both of you
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hyeyoo

Hyeonggon Yoo

Edited 1 year ago
now I'm slowly getting how CXL manages cache coherence of device memory (HDM-{H,D,DB}). my head aches.

BTW this is a good material to grasp some important concepts of of CXL.

https://arxiv.org/abs/2306.11227

Even if it's not the final version yet.
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hyeyoo

Hyeonggon Yoo

Edited 1 year ago
progress of this week:

#kerneltesting side project

Now my testing system can submit and run LAVA [1] test jobs automatically after jenkins [2] build!

[1] https://lava.kerneltesting.org/scheduler/alljobs
[2] https://jenkins.kerneltesting.org/job/slab/

currently it runs those:
- a subset of mm LTP testcases
- hackbench for a very short time
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hyeyoo

Hyeonggon Yoo

Reply to @chrisg@fosstodon.org
@chrisg
No I didn't, but looks so interesting, thanks!
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