Hyeonggon Yoo
Posts
469Following
90Followers
94- Intern @ NVIDIA Korea (Security System Software) (2024.06 ~)
- Ex-Intern @ Panmneisa (CXL emulation stuff) (~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
Hyeonggon Yoo
hyeyoo
Edited 21 days ago
I can't get this song out of my head..
In Korea this kind of song is called a 'banned song' for SAT because students can't focus on studying :P
https://www.youtube.com/watch?v=ekr2nIex040
In Korea this kind of song is called a 'banned song' for SAT because students can't focus on studying :P
https://www.youtube.com/watch?v=ekr2nIex040
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Hyeonggon Yoo
hyeyoo
Edited 22 days ago
Reviewing what I learned about Linux context switching years ago because I forgot how it works.
A note for the next time I forget:
Context is switched from one kernel context to another. When a user process is going to be rescheduled, it first switches from user context to its kernel context after storing the registers on the kernel stack (pt_regs) due to a scheduler tick.
When switching between kernel contexts, only callee-saved registers are restored (from cpu_context in thread_struct), as the other registers should have been stored on the kernel stack (by the calling convention) before calling __switch_to()->cpu_switch_to() (on ARM64).
A note for the next time I forget:
Context is switched from one kernel context to another. When a user process is going to be rescheduled, it first switches from user context to its kernel context after storing the registers on the kernel stack (pt_regs) due to a scheduler tick.
When switching between kernel contexts, only callee-saved registers are restored (from cpu_context in thread_struct), as the other registers should have been stored on the kernel stack (by the calling convention) before calling __switch_to()->cpu_switch_to() (on ARM64).
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Hyeonggon Yoo
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Vegard Nossum 🥑
vegard@mastodon.socialWe don't have enough kernel memes on here, just doing my part
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Hyeonggon Yoo
hyeyoo
Edited 22 days ago
init_task is not the task_struct of the init process but of the swapper process.
It confuses me every time.
It confuses me every time.
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Hyeonggon Yoo
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@ljs @vbabka @lkundrak
It has gotten long as it has a bit of history :P
- Someone fixed a memory leak but introduced a double-free.
- Another person fixed the double-free, reintroducing the leak.
- A third person then fixed the leak, but reverted it after noticing it introduced another double-free.
It's been there because handling all error cases properly is complicated. Luckily, it's a kind of bug that someone is very unlikely to encounter, and it only leaks 32 bytes of memory.
It has gotten long as it has a bit of history :P
- Someone fixed a memory leak but introduced a double-free.
- Another person fixed the double-free, reintroducing the leak.
- A third person then fixed the leak, but reverted it after noticing it introduced another double-free.
It's been there because handling all error cases properly is complicated. Luckily, it's a kind of bug that someone is very unlikely to encounter, and it only leaks 32 bytes of memory.
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Hyeonggon Yoo
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HAMMER SMASHED FILESYSTEM 🇺🇦
lkundrak@metalhead.club
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Hyeonggon Yoo
hyeyoo
Submitting my school assignment for “Contributing to Open Source Projects” class to linux-mm
https://lore.kernel.org/linux-mm/20241021091413.154775-1-42.hyeyoo@gmail.com/T
https://lore.kernel.org/linux-mm/20241021091413.154775-1-42.hyeyoo@gmail.com/T
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Hyeonggon Yoo
hyeyoo
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