libnvme(2)

💖 libnvme(2) — API Manual 💖

okay bestie, gather round, because today we're meeting a struct, and she is serving structure realness. this is a page from the libnvme API manual, which means it's C library territory, not command-line territory — so no flags to memorize, just one very organized lil' blob of bytes that knows exactly where everything lives. no cap. 🎀

---

✨ NAME ✨

struct nvme_perf_attr_id_list — the Performance attribute identifier list structure. that's the whole vibe. she's a list, she's about performance attributes, and she's a struct. iconic behavior honestly. 👑

---

🌸 SYNOPSIS 🌸

here's the actual shape of her, verbatim, do NOT freestyle this part:

struct nvme_perf_attr_id_list {
    __u8 attrtyp;
    __u8 msvspa;
    __u8 usvspa;
    __u8 rsvd3[13];
    struct nvme_perf_attr_id id_list[63];
    __u8 rsvd1024[3072];
 };

look at that layout. everything in its lane. glow-up via byte alignment. 🦋

---

🫶 Members 🫶

bestie this is the part where we go field by field, and yes, every single one matters, even the reserved ones (especially the reserved ones, they're the quiet kids holding the whole struct together 😭).

• attrtyp — Bits 7-3: Reserved. Bits 2-0: Attribute type. so the top five bits are doing absolutely nothing (respectfully), and the bottom three bits are the actual attribute type. lowkey a tiny field with a big job. 💅
• msvspa — Maximum saveable vendor specific performance attributes.</mark> that's the ceiling, the max number of vendor-specific perf attributes you can save. slay. ✨
• usvspa — Unused saveable vendor specific performance attributes. and this one's the leftovers — the saveable vendor specific perf attributes that are just sitting there unused. not me feeling bad for unused fields. 🙈
• rsvd3 — Reserved. that's it. she's reserved. do not perceive her. 🌸
• id_list — Performance attribute identifier list. the main character of the whole struct, honestly — the actual list of performance attribute identifiers. we stan. 👑
• rsvd1024 — Reserved. again. reserved. keeping the seat warm. 💜

quick reminder bestie: reserved means hands off. don't write to reserved fields, don't read meaning into them, don't try to make them fetch. they're padding, and padding has boundaries. periodt. 💀

---

and that's the whole page, fr fr — a sealed struct with a type field, two vendor-specific saveable-attribute counters, a 63-entry identifier list, and a whole lot of reserved breathing room. no notes. 🧚

signing off with the deets so you always know where this came from: this was the API Manual for <code>libnvme</code>, page section libnvme(2), documenting struct nvme_perf_attr_id_list, dated July 2026. mwah. keep it byte-aligned and stay hydrated. 💖🌈⭐