trace_softirq_entry(9)

💅 trace_softirq_entry — Kernel API Manual 💅

okay so bestie, you found yourself a kernel API manual page, and ngl this one is short and sweet but it's lowkey important. it's trace_softirq_entry(9), bestie — say it with me. iconic name, iconic job. ✨

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🌸 NAME 🌸

trace_softirq_entry — the tracepoint that gets called immediately before the softirq handler does its thing 🫶

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✨ SYNOPSIS ✨

void trace_softirq_entry (unsigned int vec_nr );

that's it. that's the whole vibe. one function, one arg, no drama 💅

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🎀 ARGUMENTS 🎀

• vec_nr — the softirq vector number. that's the number that tells you which softirq vector we're talking about. keep it safe, treat it right 💖

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🦋 DESCRIPTION 🦋

so here's the tea, bestie: this tracepoint fires right before the softirq handler runs. and the way that it gets really good is when you pair it with the softirq_exit tracepoint — together they let you determine the softirq handler routine. like, matching set energy. you get the entry, you get the exit, and boom: you know who the handler is. no cap. main character tracepoint behaviour, fr fr 🔥

pairing matters here — the entry tracepoint by itself is cute, but the entry + softirq_exit combo is where the actual determination happens 👑

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🌈 SEE ALSO 🌈

• Kernel file ./include/trace/events/irq.h
• trace_irq_handler_entry(9)
• trace_irq_handler_exit(9)
• trace_softirq_exit(9)
• trace_softirq_raise(9)
• trace_tasklet_entry(9)
• trace_tasklet_exit(9)

go read the whole squad, they're all in the same friend group 🧚💜

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and that's the page, bestie! this lil masterpiece comes from the source/version line ./include/trace/events and it's dated October 2026 — so yeah, she's fresh, she's got a date, and she ate. periodt. 🎀👑💖