instrument_atomic_write(9)

💅 instrument_atomic_write — like, the section 9 page, bestie ✨

Okay so this is instrument_atomic_write(9) from the Kernel API Manual, and it's literally the little gremlin that tells the instrumentation layer "hey, an atomic write is about to happen over here." Obsessed. Let's get into it 🫶

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🌸 NAME 🌸

instrument_atomic_write — instrument atomic write access ✨

🎀 SYNOPSIS 🎀

void instrument_atomic_write (const volatile void *v , size_t size );

🦋 ARGUMENTS 🦋

• v — the address of the access, bestie. That's where the magic happens 💫
• size — the size of the access. Yes, size matters, and we respect it 👑

💖 DESCRIPTION 💖

So what this does is, it instruments an atomic write access. That's it, that's the whole vibe 🌈

But here's the ✨important✨ bit, no cap: the instrumentation should be inserted before the actual write happens. Before. Not after. Not during. Before 💅 The way that ordering is literally the whole point, iykyk.

🔥 SEE ALSO 🔥

The kernel file lives at ./include/linux/instrumented.h — go read it, it's giving main character energy 📖✨

And the whole friend group is here, all of them (9) pages, all iconic:

• instrument_read(9)
• instrument_write(9)
• instrument_read_write(9)
• instrument_atomic_read(9)
• instrument_atomic_read_write(9)
• instrument_copy_to_user(9)
• instrument_copy_from_user_before(9)
• instrument_copy_from_user_after(9)
• instrument_memcpy_before(9)
• instrument_memcpy_after(9)
• instrument_get_user(9)
• instrument_put_user(9)

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⚠️ tiny vibe check: the instrumentation goes before the write. Do not come for me if you put it after. That's not the assignment 🙈

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And that's the page, bestie 🧚 This cutie came out of ./include/linux and it's dated October 2026 — yes, future-dated, she's ahead of her time 👑💜 slay, bye! 💀🎀