trace__fprintf_cpu(9)

✨ NAME ✨

okay so bestie, welcome to the trace__fprintf_cpu(9) page in the Kernel API Manual 💖 this one is literally about trace__fprintf_cpu — it prints the CPU ID to a given file stream. no cap.

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🎀 SYNOPSIS 🎀

size_t trace__fprintf_cpu (u32 cpu , FILE *fp );

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🦋 ARGUMENTS 🦋

• cpu — the CPU ID you want to print 👑
• fp — the file stream you're writing to 🫶

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🌸 DESCRIPTION 🌸

So what it does is format and print the specified CPU ID enclosed in brackets — like, for example, "[003] " — to the provided file pointer. yep, that trailing space is part of the example, bestie, don't come for me 💅

It's used to align and display the CPU ID consistently within the trace output. it's giving consistency, it's giving trace-output main character energy ✨

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⭐ RETURN ⭐

The number of characters printed. that's it, that's the return value 🎀

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🔥 SEE ALSO 🔥

• Kernel file ./tools/perf/builtin-trace.c
• struct syscall(9)

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mwah 💋 this page comes from ./tools/perf, dated October 2026, and it's serving trace__fprintf_cpu(9) realness in the Kernel API Manual 🌈👑