simple_ring..._reader_page(9)

💫 simple_ring..._reader_page(9) 💫

okay so this is a page straight out of the Kernel API Manual, and bestie, it's a short one but it's iconic. it's giving "tiny function, huge responsibility" energy. let's get into it 🫶

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✨ NAME ✨

simple_ring_buffer_swap_reader_page — swap ring-buffer head with the reader, no cap 💅

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🦋 SYNOPSIS 🦋

int simple_ring_buffer_swap_reader_page (struct simple_rb_per_cpu
*cpu_buffer );

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🎀 ARGUMENTS 🎀

• cpu_buffer — a simple_rb_per_cpu. that's it, that's the whole vibe. give her the struct and she'll do her thing ✨

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🌸 DESCRIPTION 🌸

so basically this function enables consuming reading — like, it turns the "okay we can actually read this now" switch on. 🔥

it makes sure the current head page will not be overwritten, so it can be safely read. the way that head page is protected... main character energy fr fr 👑

return values, because we love a clear ending:

• 0 — slay, success 💖
• -ENODEV — cpu_buffer was unloaded 😭
• -EBUSY — we failed to catch the head page 🙈

ngl the -EBUSY one is the "she's booked and busy" of error codes — you just couldn't catch her in time. no drama, just try again later.

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🧚 SEE ALSO 🧚

• kernel file ./kernel/trace/simple_ring_buffer.c — go read the source, iykyk 📖
• simple_ring_buffer_reserve(9)
• simple_ring_buffer_commit(9)
• simple_ring_buffer_reset(9)
• simple_ring_buffer_init(9)
• simple_ring_buffer_unload(9)
• simple_ring_buffer_enable_tracing(9)

the whole friend group, all linked up 🌈⭐

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aaaand that's the page!! 🎀 shoutout to ./kernel/trace and the October 2026 girlies — this one dropped in October 2026, mwah 💜💅