ENUM RDTGRP_MODE(9)

🦋 enum rdtgrp_mode(9) 🦋

okay bestie, so this is from the Kernel API Manual and honestly it's giving lowkey iconic resource-group energy 💅 we're talking about an enum — yes, a whole enum — that describes the mode of an RDT resource group. Don't worry, I gotchu, we're gonna walk through it together ✨

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✨ NAME ✨

enum rdtgrp_mode — literally just the Mode of a RDT resource group 🎀

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🌸 SYNOPSIS 🌸

enum rdtgrp_mode {
    RDT_MODE_SHAREABLE ,
    RDT_MODE_EXCLUSIVE ,
    RDT_MODE_PSEUDO_LOCKSETUP ,
    RDT_MODE_PSEUDO_LOCKED ,
    RDT_NUM_MODES

};

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👑 CONSTANTS 👑

💖 RDT_MODE_SHAREABLE

This resource group is in its sharing era — it allows sharing of its allocations 🫶

🔥 RDT_MODE_EXCLUSIVE

The opposite vibe, fr fr — no sharing of this resource group's allocations allowed. Not even a little. 🙈

🎀 RDT_MODE_PSEUDO_LOCKSETUP

This resource group is gonna be used for Pseudo-Locking ✨ (it's preparing, it's in its setup arc)

💜 RDT_MODE_PSEUDO_LOCKED

No sharing of this resource group's allocations allowed AND the allocations are Cache Pseudo-Locked. Double whammy, no cap 😭

⭐ RDT_NUM_MODES

The total number of modes — just the headcount, the roster count, the "how many of us are there" number 🧚

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💫 DESCRIPTION 💫

So the mode of a resource group is what lets you control the allowed overlap between allocations associated with different resource groups (aka classes of service). You, the user, can modify the mode of a resource group by writing to the "mode" resctrl file associated with the resource group. That's the whole move 💅

The "shareable", "exclusive", and "pseudo-locksetup" modes are set by writing the appropriate text to the "mode" file. Periodt.

And a resource group enters "pseudo-locked" mode after the schemata is written while the resource group is in "pseudo-locksetup" mode. It's giving glow-up pipeline, honestly 🌈

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🦋 SEE ALSO 🦋

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

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and that's the whole page bestie 🫶 this gem comes to you from ./fs/resctrl, dated October 2026, under the title enum rdtgrp_mode(9) — go forth and mode responsibly 💖✨🎀