prb_record_text_space(9)

💅 prb_record_text_space — a.k.a. the "how much room did my text actually eat" check 🍓

okay bestie, welcome to prb_record_text_space(9) from the Kernel API Manual — yes that's a section 9 page, we're in kernel-dev territory, hydrate and stay with me 🫶

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✨ NAME ✨

prb_record_text_space — literally just ask the ringbuffer: "hey, how much actual space is my reserved entry's text data taking up rn?" 💖 Query the full actual used ringbuffer space for the text data of a reserved entry. That's the whole vibe.

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🌸 SYNOPSIS 🌸

unsigned int prb_record_text_space (struct prb_reserved_entry *e );

that's it. one argument. one unsigned int back. we love a low-drama signature 👑

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🎀 ARGUMENTS 🎀

• e — the entry you already successfully reserved, and the one you're lowkey interrogating rn. it must be successfully reserved, or this whole thing is a no 💀

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🦋 DESCRIPTION 🦋

so this is the public function — the one writers like you get to call — and it tells you how much actual space is being used inside the ringbuffer to store the text data of the entry you point at 🌈

like, not the vibes-estimate. the actual space. for the text data. of that specific entry. iconic behavior honestly.

⚠️ important caveat bestie, do NOT skip: this function is only valid if e has been successfully reserved using prb_reserve. that's the whole entry ticket. no successful reserve, no query. periodt 💅

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⭐ CONTEXT ⭐

Any context. fr fr — any context. she does not care where you're calling from, she's chill like that 🧚

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🔥 RETURN 🔥

The size in bytes used by the text data of the associated record. bytes! that's your number! go spend it wisely 💜

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👑 SEE ALSO 👑

the whole friend group, no cap:

• Kernel file ./kernel/printk/printk_ringbuffer.c
• printk_ringbuffer overview(9)
• prb_reserve_in_last(9)
• prb_reserve(9)
• prb_commit(9)
• prb_final_commit(9)
• prb_next_reserve_seq(9)
• prb_read_valid(9)
• prb_read_valid_info(9)
• prb_first_valid_seq(9)
• prb_next_seq(9)
• prb_init(9)

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aaaaand that's the page 🎀 cute lil sign-off: this one lives under ./kernel/printk and it's dated October 2026, so yeah, she's fresh 💖 now go reserve something and measure it, bestie 🦋✨