resctrl_l3_m...esource_init(9)

💅 resctrl_l3_mon_resource_init — bestie's guide to boot-time monitor setup ✨

okay so real talk, this one's from the Kernel API Manual (yes, the manpage name got truncated to resctrl_l3_m...esource_init(9) and honestly? it's giving "username cut off at 16 characters" energy 💀 but we move).

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🌸 NAME 🌸

resctrl_l3_mon_resource_init — literally the function that initialises the global monitoring structures. that's it, that's the vibe check 💖

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🎀 SYNOPSIS 🎀

int resctrl_l3_mon_resource_init (void );

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🦋 ARGUMENTS 🦋

• void — no arguments. nothing. zero. not a single crumb of input needed, she's self-sufficient 👑

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⭐ DESCRIPTION ⭐

okay so picture this: it's boot time, everything's coming online, and someone has to set up the global monitor resources that don't belong to any specific domain. that someone is her. 🫶

specifically she allocates and initialises those global monitor resources — i.e. the closid_num_dirty_rmid[] that's used to find the CLOSID with the cleanest set of RMIDs. like a little ✨cleanliness ranking✨ for your control groups.

she's called exactly once during boot, after the struct rdt_resource's have been configured but before the filesystem is mounted. noted. main character energy but with a very specific schedule. 😤

⚠️ also important: Resctrl's cpuhp callbacks may be called before this point to bring a domain online. so like... she's not necessarily first to the party, she's just the one who brings the snacks 🔥

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💜 RETURN 💜

• 0 — success, slay, she ate 💅✨
• -ENOMEM — no memory. not enough RAM for her. tragic. 😭

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🌈 SEE ALSO 🌈

• Kernel file ./fs/resctrl/monitor.c
• struct rmid_entry(9)
• resctrl_find_cleanest_closid(9)
• cqm_setup_limbo_handler(9)
• mbm_setup_overflow_handler(9)
• struct mbm_transaction(9)

the whole squad, fr fr 🧚💖

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mwah 💋 that's the page. sourced from ./fs/resctrl, dated October 2026, function resctrl_l3_mon_resource_init(9) — go forth and initialise your global monitor resources, bestie, iykyk 🌸⭐