ring_buffer_bytes_cpu(9)

✨ NAME ✨

okay bestie, say hi to ring_buffer_bytes_cpu(9) from the Kernel API Manual 💖. She’s the function that gets the number of bytes unconsumed in a cpu buffer — literally that’s her whole job, no cap. The signature is giving unsigned long, and the synopsis is right below so you can copy it exactly, periodt.

✨ SYNOPSIS ✨

unsigned long ring_buffer_bytes_cpu (struct trace_buffer *buffer , int cpu );

🎀 ARGUMENTS 🎀

Here’s the tea, bestie — only two arguments, both iconic:

• buffer — the ring buffer. 👑
• cpu — the per CPU buffer to read from. 💅

🦋 SEE ALSO 🦋

The kernel file ./kernel/trace/ring_buffer.c is the source-side main character, and here’s the whole SEE ALSO squad — every single one, fr fr:

• ring_buffer_event_length(9), ring_buffer_event_data(9), rb_page_capacity(9), rb_subbuf_capacity(9), rb_subbuf_max_data_size(9), rb_subbuf_start(9), ring_buffer_event_time_stamp(9)
• ring_buffer_nr_dirty_pages(9), ring_buffer_wake_waiters(9), ring_buffer_wait(9), ring_buffer_poll_wait(9), rb_check_pages(9), rb_validate_buffer(9)
• __ring_buffer_alloc(9), __ring_buffer_alloc_range(9), __ring_buffer_alloc_remote(9), ring_buffer_free(9), ring_buffer_resize(9), rb_update_event(9)
• ring_buffer_nest_start(9), ring_buffer_nest_end(9), ring_buffer_unlock_commit(9), ring_buffer_lock_reserve(9), ring_buffer_discard_commit(9), ring_buffer_write(9)
• ring_buffer_record_disable(9), ring_buffer_record_enable(9), ring_buffer_record_off(9), ring_buffer_record_on(9), ring_buffer_record_is_on(9), ring_buffer_record_is_set_on(9), ring_buffer_record_is_on_cpu(9)
• ring_buffer_record_disable_cpu(9), ring_buffer_record_enable_cpu(9), ring_buffer_oldest_event_ts(9), ring_buffer_entries_cpu(9), ring_buffer_overrun_cpu(9), ring_buffer_commit_overrun_cpu(9), ring_buffer_dropped_events_cpu(9), ring_buffer_read_events_cpu(9)
• ring_buffer_entries(9), ring_buffer_overruns(9), ring_buffer_iter_reset(9), ring_buffer_iter_empty(9), ring_buffer_peek(9), ring_buffer_iter_peek(9), ring_buffer_consume(9)
• ring_buffer_read_start(9), ring_buffer_read_finish(9), ring_buffer_iter_advance(9), ring_buffer_size(9), ring_buffer_max_event_size(9), ring_buffer_reset_cpu(9), ring_buffer_reset_online_cpus(9), ring_buffer_reset(9)
• ring_buffer_empty(9), ring_buffer_empty_cpu(9), ring_buffer_swap_cpu(9), ring_buffer_alloc_read_page(9), ring_buffer_free_read_page(9), ring_buffer_read_page(9)
• ring_buffer_read_page_data(9), ring_buffer_read_page_size(9), ring_buffer_subbuf_size_get(9), ring_buffer_subbuf_order_get(9), ring_buffer_subbuf_order_set(9)

mwah 💋 — signed off from ./kernel/trace, dated October 2026, and yes this is ring_buffer_bytes_cpu(9) leaving the group chat 🫶✨