STRUCT RDT_HW_CTRL_DOMAIN(9)

💅 struct rdt_hw_ctrl_domain — the kernel API manual, bestie edition ✨

okay so real talk, this one lives in the Kernel API Manual, and it's lowkey iconic because it's the arch-private side of a whole CPU resource situation. get comfy 🎀

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🦋 NAME

struct rdt_hw_ctrl_domain — the arch-private attributes of a set of CPUs that share a resource for a control function. no cap, that's the whole vibe ✨

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🌸 SYNOPSIS

struct rdt_hw_ctrl_domain {
    struct rdt_ctrl_domain          d_resctrl;
    u32 *ctrl_val;
 };

that's it, that's the struct 💖 (yes there's a lil space before that closing }; in the original, we're keeping it exactly as it is, character for character, periodt.)

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🎀 Members

• d_resctrl — the properties that get exposed to the resctrl file system 🫶 this is the part the outside world actually sees.
• ctrl_val — an array of cache or mem ctrl values, indexed by CLOSID 👑 iykyk.

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💜 Description

so here's the tea ☕: the members of this structure aren't meant to be poked at directly, bestie. they're accessed via helpers that provide abstraction. that's the whole point — the helpers handle it, you just vibe 😌

literally just use the helpers fr fr.

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🙈 do not go reaching into these fields raw, the abstraction helpers are literally right there and they're the main character energy of this struct. slay responsibly 💅

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🌈 SEE ALSO

• Kernel file ./arch/x86/kernel/cpu/resctrl/internal.h
• struct arch_mbm_state(9)
• struct rdt_hw_l3_mon_domain(9)
• struct rdt_perf_pkg_mon_domain(9)
• struct msr_param(9)
• struct rdt_hw_resource(9)

go read those too, they're all part of the same friend group 🦋✨

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that's the page, bestie 💖 this one comes to you from ./arch/x86/kernel/cpu/resctrl, dated October 2026 — drink some water, hydrate, and go abstract responsibly 😭👑🍓