trace_seq_vprintf(9)

💜 trace_seq_vprintf — Kernel API Manual edition, bestie ✨

okay so you found yourself in the Kernel API Manual and the page is literally called trace_seq_vprintf(9) — yes that's the whole title, we love a long name, very main character 💅

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🦋 NAME 🦋

trace_seq_vprintf — sequence printing of trace information, periodt.

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🌸 SYNOPSIS 🌸

void trace_seq_vprintf (struct trace_seq *s , const char *fmt , va_list
args );

that's the whole signature, copy it exactly, no cap 🫶

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✨ ARGUMENTS ✨

• s — the trace sequence descriptor. she's the vibe, she's where everything goes 🎀
• fmt — the printf format string. yes, that kind of format string, bestie
• args — the arguments for the format string 💖

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🔥 DESCRIPTION 🔥

so here's the tea ☕ — the tracer is allowed to use <highlight>either</highlight> sequence operations <highlight>or</highlight> its own copy to user routines. two paths, both valid, pick your fighter 💀

to simplify formatting of a trace, trace_seq_printf is used to store strings into a special buffer (s). think of s as the group chat and the strings as the messages you're dropping in 🧚

then the output may be either used by the sequencer, or pulled into another buffer. either way she's serving 🌈

lowkey important: this page is about trace_seq_vprintf but the description talks about trace_seq_printf — that's just what the original says, so I'm not gonna gaslight you and change it 🙈

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👑 SEE ALSO 👑

like, go read these too, they're all iconic in their own way 💅

• the kernel file ./kernel/trace/trace_seq.c (yes, actually go look at it 📂)
• trace_print_seq(9)
• trace_seq_printf(9)
• trace_seq_bitmask(9)
• trace_seq_bitmask_list(9)
• trace_seq_bprintf(9)
• trace_seq_puts(9)
• trace_seq_putc(9)
• trace_seq_putmem(9)
• trace_seq_putmem_hex(9)
• trace_seq_path(9)
• trace_seq_to_user(9)

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okay that's the whole page, you ate that 🍓 and for the cute sign-off: this one lives under ./kernel/trace and it's dated October 2026, so mark your calendar bestie ⭐🦋💜