ring_buffer_...rd_is_on_cpu(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ring_buffer_record_is_on_cpu — from the Kernel API Manual (section 9), bestie edition 🎀

okay so you opened the Kernel API Manual and landed on this one, and honestly? it's a lil cutie. it's a yes/no girlie. it tells you whether the ring buffer is currently willing to accept writes on a specific CPU. that's the whole vibe. let's get into it ✨

🌸 NAME 🌸

ring_buffer_record_is_on_cpu — return true if the ring buffer can write

like, that's literally the whole personality. it returns true if the ring buffer can write. no cap 💅

🫶 SYNOPSIS 🫶

bool ring_buffer_record_is_on_cpu (struct trace_buffer *buffer , int cpu
);

it takes two things and gives you back a bool. short, sweet, iconic 👑

🦋 ARGUMENTS 🦋

  • buffer — the ring buffer you're checking on, aka the one you're asking "bestie, are you accepting writes rn?" 🍓
  • cpu — the CPU you want to test, because the ring buffer can be writing on some CPUs and not others, and you gotta be specific about which one you're asking about 💖

🔥 DESCRIPTION 🔥

Returns true if the ring buffer is in a state where it accepts writes for a particular CPU. that's it. that's the function. no weird side quests, no hidden lore. it's giving "simple and reliable" and we love that for it 🌈

👑 SEE ALSO 👑

so the source for all this lives in the kernel file ./kernel/trace/ring_buffer.c, and the whole ring buffer friend group is listed below — every single one of them, because nobody gets left out in this house 🫶

like yes that's a lot of reading but every single one ate, i fear 💀✨

and that's the page, bestie!! 💖 brought to you straight out of ./kernel/trace, dated October 2026 — go forth and check your buffers, mwah 🧚‍♀️🌸

📦 where this page comes from