instrument_write(9)

💖 instrument_write(9) 💖

okay so bestie, welcome to the Kernel API Manual — literally the group chat of kernel docs, and today's main character is instrument_write. periodt. 🎀

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✨ NAME ✨

instrument_write — instruments a regular write access, aka it's the lil pre-game ritual before the actual write goes down 👑

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🦋 SYNOPSIS 🦋

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

like… that's the whole signature. short and iconic. 💅

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🌸 ARGUMENTS 🌸

• v — address of access. like, where the tea is happening 📍
• size — size of access. how much of it we're sipping 🍓

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⭐ DESCRIPTION ⭐

okay so real talk: this instruments a regular write access. the instrumentation should be inserted before the actual write happens — not after, not during, not "whenever you feel like it". before. that's the vibe. no cap. 🔥

think of it as the vibe check that happens right before the write walks in the room. 🧚

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🌈 SEE ALSO 🌈

the whole fam is in the kernel file ./include/linux/instrumented.h — go say hi to the siblings, they're all lowkey iconic:

• instrument_read(9)
• instrument_read_write(9)
• instrument_atomic_read(9)
• instrument_atomic_write(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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okay that's the whole page bestie, you ate that reading ngl 🫶

this masterpiece lives in ./include/linux and it's dated October 2026 — yes that's the version/date energy, slay. 💜