trace_print_lat_fmt(9)

💅 trace_print_lat_fmt(9) — like, the kernel API manual bestie ✨

okay so this is a page from the Kernel API Manual, and honestly? it's a little one but it serves. it's all about trace_print_lat_fmt, and if you're poking around ftrace internals, you're gonna want to know her 🫶

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🌸 NAME 🌸

trace_print_lat_fmt — prints the irq, preempt and lockdep fields, no cap 💅

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✨ SYNOPSIS ✨

int trace_print_lat_fmt (struct trace_seq *s , struct trace_entry *entry );

like, that's the whole signature. short queen, iconic behavior 👑

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🎀 ARGUMENTS 🎀

• s — the trace seq struct you're writing to, that's her whole job 💖
• entry — the trace entry field, straight out of the ring buffer, bestie 🌈

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🦋 DESCRIPTION 🦋

so what does she actually do? she prints the generic fields — irqs off, in hard or softirq, and the preempt count. that's it. that's the vibe check and she passes ⭐

ngl it's a small function but it's doing main character energy work in the trace output pipeline, fr fr

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💜 SEE ALSO 💜

• the kernel file ./kernel/trace/trace_output.c — go read her, iykyk 📖
• trace_print_bitmask_seq(9)
• trace_print_hex_seq(9)
• ftrace_find_event(9)
• register_trace_event(9)
• unregister_trace_event(9)

like, the whole squad 🫶 they all hang out together

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and that's the page!! 🎀 this cutie lives in ./kernel/trace, it's dated October 2026, and it's page trace_print_lat_fmt(9) of the Kernel API Manual — slay, go read the source bestie 💅✨🔥