STRUCT TSA_IOSTAT(9)

💅 NAME 💅

struct tsa_iostat — the I/O-Status Transport-Status Area, aka the IO-Stat TSA. Bestie, it's literally the receipts for your I/O. 🧾✨

🌸 SYNOPSIS 🌸

okay so picture this struct, right? here's exactly what it looks like, no cap:

struct tsa_iostat {
    u32 dev_time;
    u32 def_time;
    u32 queue_time;
    u32 dev_busy_time;
    u32 dev_act_time;
    u8 sense[32];
 };

that's it. that's the whole vibe. 🫶

✨ Members ✨

• dev_time — Device Time. the moment-coded field, it's giving "when did the device do the thing" 💅
• def_time — Defer Time. the "we waited, respectfully" field 🎀
• queue_time — Queue Time. how long it sat in line like everyone at a coffee shop at 8am ☕😭
• dev_busy_time — Device-Busy Time. bestie was booked and busy, fr fr 🔥
• dev_act_time — Device-Active-Only Time. not busy-busy, just active active — main character energy only 👑
• sense — Sense Data (if present). the "if present" is doing so much heavy lifting here 🙈 it's a u8 array of 32 and yeah, that's the whole field

🦋 SEE ALSO 🦋

• the kernel file ./arch/s390/include/asm/fcx.h — the whole friend group lives there 🫶
• struct tcw(9)
• struct tidaw(9)
• struct tsa_intrg(9)
• struct tsb(9)
• struct dcw_intrg_data(9)
• struct dcw(9)
• struct tccb_tcah(9)
• struct tccb_tcat(9)
• struct tccb(9)

go read them all, iykyk 📚✨

ngl this one's short and sweet, but it's still iconic — every field matters, so don't skip any of them 🎀

and that's a wrap, bestie! 🌈 this page comes to you straight from ./arch/s390/include/asm, dated October 2026, and it's filed under struct tsa_iostat(9) in the Kernel API Manual. slay, stay curious, and go read a struct today 💖⭐🍓