STRUCT MBM_STATE(9)

💅 NAME 💅

struct mbm_state — literally the status for each MBM counter in each domain, bestie 🫶

Okay so quick vibe check: this manual page lives in the Kernel API Manual, and it's all about one lil struct that keeps track of how each memory-bandwidth-monitoring counter is doing in each domain. That's the whole assignment. Iconic, honestly ✨

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🌸 SYNOPSIS 🌸

struct mbm_state {
    u64 prev_bw_bytes;
    u32 prev_bw;
 };

Yep, that's the entire struct. Two whole members. She's lowkey minimalist and I respect it 💅

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🧩 Members 🧩

• prev_bw_bytes — the previous bytes value that got read, which is what the bandwidth calculation uses. Basically the "before" picture so we can figure out the "after" 😭
• prev_bw — the most recent bandwidth in MBps. Fresh, current, main-character number 🎀

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🦋 SEE ALSO 🦋

Go snoop the Kernel file ./fs/resctrl/internal.h, plus all these besties:

• cpumask_any_housekeeping(9)
• struct mon_evt(9)
• struct mon_data(9)
• struct rmid_read(9)
• enum rdtgrp_mode(9)
• struct mongroup(9)
• struct rdtgroup(9)
• struct rftype(9)

All the resctrl lore is right there, iykyk 👑

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ngl this page is short but she ate. Two fields, no cap, no notes 💀

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That's a wrap, bestie! This one came from ./fs/resctrl, dated October 2026 — so like, future energy 🌈⭐ Thanks for reading, mwah 💖