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A professional kernel hacker, born in August 6, 2000, and living in Korea (the South one!).

- Linux Kernel Developer @ Oracle (Linux Kernel MM) (2025.02 ~ Present)
- A slab subsystem co-maintainer and a reviewer for the 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
repeated
ljs

OK so that, minus descriptions of things like mprotect(), madvise(), mremap() and general review and cleanup is process memory done.

Been working on this part of the book (initially I thought it'd be 1 chapter, lol) for at least 6 months.

After a month of basically no book progress due to being away for lsf/mm and ill this is a great relief and keeps me on time after my last reschedule of targets.

Next: OOM killer chapter which, when done, will be released as a sample chapter.
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to
@cwayne @ljs

I'm really sorry to hear you guys are having such a tough time. My experience of life may be limited compared to yours, and I may not fully understand, but I'm here to support you in any way I can.
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @vbabka
@vbabka @MASTERBOOTRECORD

what, already infected even before I buy it?
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @hyeyoo
Called several school departments today and regained access to the e-learning site :P
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @vbabka
@vbabka @MASTERBOOTRECORD

wow, that's quite a blast from the past!

did it end up infecting other computers as well, or mess up your computer?
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @vbabka
@vbabka @MASTERBOOTRECORD

How have you managed to boot without master boot record?
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to
@vbabka @kernellogger @sj @ljs

the strategy of utilizing LLMs for documentation might be useful for motivating someone to think "Oh, this is a piece of shit, I should completely rewrite it"
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 3 years ago
I was unable to access my school's e-learning site this morning. Turns out I was expelled from school for unknown reason. I was panicking, but a school employee called me to say that there was a mistake while processing scholarship for school tuition and everything will be fine.
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hyeyoo

Harry (Hyeonggon) Yoo

off and off
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to @ljs
@ljs @cwayne @vbabka
Don't forget to mention me when discussing
g dumb idiots
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to
@kernellogger @ljs

lol there are already so many obstacles in this driver's way
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hyeyoo

Harry (Hyeonggon) Yoo

Reply to
@kernellogger @ljs

I use KVM only for kernel development and virtualbox/vmware for other work.

Because I'm not familiar with KVM yet,
maybe this is the chance to completely migrate to KVM ;)
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hyeyoo

Harry (Hyeonggon) Yoo

Edited 3 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 3 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 3 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 3 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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