Posts
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Following
99
Followers
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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

Edited 2 years ago
looks like @ljs 's changes to GUP broke my out-of-tree virtualbox driver. out-of-tree drivers suck :P
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @ljs
Edited 2 years ago
@ljs @ptesarik Yes! "might be the case" was was not clear ;)
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @hyeyoo
Edited 2 years ago
@ptesarik @ljs

I thought maybe freeing unnecessary vmemmap pages for HugeTLB pages might be the case, but it seems to remap to first vmemmap page. And if I am not mistaken pfn_valid() will return true for them.
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hyeyoo

Harry (Hyeonggon) Yoo

Starting to like Joan's drawings more
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hyeyoo

Harry (Hyeonggon) Yoo

TIL: NUMA configuration and distance matrix are parsed from device trees, ACPI, or dummy configuration is used.
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
Videos of LSFMMBPF Summit / OSSNA sessions are now available on Youtube:


https://youtube.com/playlist?list=PLbzoR-pLrL6rlmdpJ3-oMgU_zxc1wAhjS

https://youtube.com/playlist?list=PLbzoR-pLrL6p445pIqTLUIzsceFp_puSy
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to
@ptesarik @ljs

When do usable PFNs (for which pfn_valid() is false) exist?
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @vbabka
LMAO probably should launch more like the north one?
(...learning how to make a joke...)
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hyeyoo

Harry (Hyeonggon) Yoo

South Korea's space rocket Nuri launched

https://en.yna.co.kr/view/AEN20230524009656320
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @ljs
@ljs @vbabka Can't even imagine what it was like before CoC was introduced.
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @ljs
Edited 2 years ago
@ljs when does it matter? the only thing I know about it is that the kernel does not have struct page when pfn_valid() is false.
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @ljs
Edited 2 years ago
@ljs Feeling much better to hear that, thank you! I need to be stronger ;)
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
seems I made a mistake,
want to be more wise and strong!
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @ljs
Edited 2 years ago
@ljs My mind, thoughts, and process of reasoning are easily broken too :)
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hyeyoo
repeated
vbabka

SLAB deprecation posted! So many defconfigs...
https://lore.kernel.org/all/20230523091139.21449-1-vbabka@suse.cz/
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @vbabka
@vbabka sounds like there isn't much benefit.
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 2 years ago
[Intel Publishes "X86-S" Specification For 64-bit Only Architecture]( https://www.phoronix.com/news/Intel-X86-S-64-bit-Only )

Not booting from real mode (-> protected mode -> long mode) anymore.
Still seems to support running 32 bit applications on 64 bit kernel.

Wait, who wants to run 32 bit kernel on 64 bit processors?
How much silicon is saved with this new ISA?
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hyeyoo

Harry (Hyeonggon) Yoo

My dream tonight was really strange: I was kidnapped and forced to do kernel work, and then I was sold to a software company.
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @vbabka
@vbabka @sj @ljs

Too bad, hope you guys get well soon!
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to
@cwayne I don't like getting older since 18
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