PROBE::IOSCHEDULER.ELV_ADD_REQUEST.TP(3stap)

💖 PROBE::IOSCHEDULER.ELV_ADD_REQUEST.TP 💖

okay bestie so this is a page straight out of the SystemTap Tapset Reference, section 3stap, and it's all about one very specific little probe point 🎀

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✨ NAME ✨

probe::ioscheduler.elv_add_request.tp — a tracepoint based probe that lets you know a request just got added to the request queue 🫶

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🌸 SYNOPSIS 🌸

probe ioscheduler.elv_add_request.tp {}

yep that's it, that's the whole vibe ✨ no args, no drama, just vibes

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🦋 VALUES 🦋

so when this probe fires, here's everything you get handed to you in your script, and every single one of them is lowkey important:

• elevator_name — the type of I/O elevator that's currently enabled 💅 (yes the scheduler is called an elevator, iconic naming honestly)
• disk_minor — the disk minor number of the request 🎀
• name — the name of the probe point itself, iykyk 🌸
• rq_flags — the request flags, all the little flaggy details 🔥
• q — a pointer to the request queue 👑
• rq — the address of the request, like where it actually lives 💜
• disk_major — the disk major number of the request ⭐

not me listing all seven of these and each one being genuinely useful 😭 collect them all fr fr

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🌈 SEE ALSO 🌈

• tapset::ioscheduler(3stap)

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and that's the whole page bestie!! no cap, every value, every section, all of it. this one came out of the SystemTap Tapset Reference, Version Ver, dated September 2026 — so go forth, probe that request queue, and slay 💅✨🦋💖

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