mongrp_reparent(9)

💖 mongrp_reparent(9) 💖

hiii bestie 🫶 this is the mongrp_reparent(9) page from the Kernel API Manual, and it's honestly a short little icon. Let's get into it ✨

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🎀 NAME 🎀

mongrp_reparent — replace parent CTRL_MON group of a MON group

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✨ SYNOPSIS ✨

okay so here's the exact signature, no cap:

void mongrp_reparent (struct rdtgroup *rdtgrp , struct rdtgroup
       *new_prdtgrp , cpumask_var_t cpus );

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🌸 ARGUMENTS 🌸

• rdtgrp — the MON group whose parent should be replaced 💅
• new_prdtgrp — replacement parent CTRL_MON group for rdtgrp 👑
• cpus — cpumask provided by the caller for use during this call 🌈

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🦋 DESCRIPTION 🦋

So basically: this replaces the parent CTRL_MON group for a MON group. The result? All member tasks' CLOSID immediately changes to that of the new parent group — immediately, bestie, like a vibe check but for task groups 💀

And the monitoring data for the group is unaffected by this operation. Literally unaffected. Not touched. Iconic behavior, honestly ✨

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💜 SEE ALSO 💜

The kernel file in question is ./fs/resctrl/rdtgroup.c, and here's the whole related-page friend group:

• closid_allocated(9)
• rdtgroup_mode_by_closid(9)
• rdtgroup_mode_str(9)
• rdtgroup_remove(9)
• rdtgroup_tasks_assigned(9)
• __rdtgroup_cbm_overlaps(9)
• rdtgroup_cbm_overlaps(9)
• rdtgroup_mode_test_exclusive(9)
• rdtgroup_cbm_to_size(9)
• rdtgroup_kn_mode_restrict(9)
• rdtgroup_kn_mode_restore(9)
• mon_get_kn_priv(9)
• mon_put_kn_priv(9)
• cbm_ensure_valid(9)
• domain_setup_l3_mon_state(9)
• resctrl_exit(9)

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🫶 that's the whole page, bestie — source is ./fs/resctrl, dated October 2026, and it's the mongrp_reparent(9) manual page. byeee 💖