STRUCT RDTGROUP(9)

💅 struct rdtgroup(9) — like, the whole entire vibe

okay bestie, so this is a page from the Kernel API Manual (that's the manual name, yes, we're fancy now 🎀) and it's all about struct rdtgroup, which — per the NAME section — stores rdtgroup's data in resctrl file system. that's it. that's the whole point of its existence. main character struct energy fr fr 👑

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✨ SYNOPSIS ✨

here's the whole thing, exactly as it lives, do not touch, no notes:

struct rdtgroup {
    struct kernfs_node              *kn;
    struct list_head                rdtgroup_list;
    u32 closid;
    struct cpumask                  cpu_mask;
    int flags;
    atomic_t waitcount;
    enum rdt_group_type             type;
    struct mongroup                 mon;
    enum rdtgrp_mode                mode;
    enum resctrl_event_id           mba_mbps_event;
    struct pseudo_lock_region       *plr;
 };

lowkey gorgeous. she has structure. she has fields. we stan a well-organized struct 🌸

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🦋 Members 🦋

okay so now we go member by member, like a lil tour of the group chat 💅

• kn — the kernfs node. that's her little foothold in the filesystem world ✨
• rdtgroup_list — linked list for all the rdtgroups. everyone's connected, it's giving group chat directory 🫶
• closid — the closid for this rdtgroup. yes it's named the same as the field, no we're not confused, it's just like that 😭
• cpu_mask — the CPUs assigned to this rdtgroup. which CPUs are in her orbit 💫
• flags — status bits. little mood indicators 🔥
• waitcount — how many cpus expect to find this group when they acquire rdtgroup_mutex. so literally a headcount of who's waiting at the door, no cap 🚪
• type — indicates type of this rdtgroup — either monitor only or ctrl_mon group. pick a lane, queen 👑
• mon — mongroup related data. the monitoring side of the operation 🍓
• mode — mode of resource group. what's her setting, what's her season 🌈
• mba_mbps_event — input monitoring event id when mba_sc is enabled. only relevant when that's on, iykyk ⭐
• plr — pseudo-locked region. locked, loaded, iconic 💜

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🌸 SEE ALSO 🌸

go read these next, bestie, they're all part of the same little family:

• Kernel file ./fs/resctrl/internal.h
• cpumask_any_housekeeping(9)
• struct mon_evt(9)
• struct mon_data(9)
• struct rmid_read(9)
• enum rdtgrp_mode(9)
• struct mongroup(9)
• struct rftype(9)
• struct mbm_state(9)

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💀 tiny heads up, the SEE ALSO line literally reads "Kernel file ./fs/resctrl/internal.h" followed straight into the function list — so that's how we're doing it here too. periodt.

and that's the page 🧚 mwah 💖

source/version: ./fs/resctrl — dated October 2026 — and the page is struct rdtgroup(9) itself, so like, it's self-titled, we love a self-aware icon 🎀✨