STRUCT RDT_CTRL_DOMAIN(9)

💅 struct rdt_ctrl_domain(9) 💅

okay bestie, welcome to the kernel API manual ✨ — this one's all about struct rdt_ctrl_domain, which is literally just a group of CPUs sharing a resctrl control resource. that's the whole vibe. a little squad of CPUs pooling their control resources together 🫶

🌸 SYNOPSIS 🌸

here's the shape of it, no cap:

struct rdt_ctrl_domain {
    struct rdt_domain_hdr           hdr;
    struct pseudo_lock_region       *plr;
    struct resctrl_staged_config    staged_config[CDP_NUM_TYPES];
    u32 *mbps_val;
 };

✨ Members ✨

so like, member by member, here's the tea 🍓:

• hdr — the common header for different domain types. every domain type shares this lil header, iykyk 👑
• plr — the pseudo-locked region (if any) that's associated with this domain. key words: if any 🙈
• staged_config — the parsed configuration that's just sitting there waiting to be applied. it's giving "outfit picked out but not worn yet" 💅
• mbps_val — when mba_sc is enabled, this holds the array of user-specified control values for mba_sc in MBps, indexed by closid. so yeah, it's an array, it's user-specified, it's in MBps, and closid is doing the indexing 📊

🦋 SEE ALSO 🦋

literally go read these next, bestie:

• Kernel file ./include/linux/resctrl.h
• enum resctrl_conf_type(9)
• struct resctrl_staged_config(9)
• struct rdt_domain_hdr(9)
• struct mbm_cntr_cfg(9)
• struct rdt_l3_mon_domain(9)
• struct resctrl_cache(9)
• enum membw_throttle_mode(9)
• struct resctrl_membw(9)
• enum resctrl_schema_fmt(9)
• struct resctrl_mon(9)
• struct rdt_resource(9)
• struct resctrl_schema(9)
• resctrl_arch_sync_cpu_closid_rmid(9)
• resctrl_get_default_ctrl(9)
• resctrl_arch_mon_event_config_write(9)
• resctrl_arch_mon_event_config_read(9)
• resctrl_arch_mbm_cntr_assign_enabled(9)
• resctrl_arch_mbm_cntr_assign_set(9)
• resctrl_arch_rmid_read(9)
• resctrl_arch_rmid_read_context_check(9)
• resctrl_find_domain(9)
• resctrl_arch_reset_rmid(9)
• resctrl_arch_reset_rmid_all(9)
• resctrl_arch_reset_all_ctrls(9)
• resctrl_arch_config_cntr(9)
• resctrl_arch_cntr_read(9)
• resctrl_arch_reset_cntr(9)
• resctrl_arch_io_alloc_enable(9)
• resctrl_arch_get_io_alloc_enabled(9)

aaaaand that's the whole page!! 🎀 it lives in ./include/linux in the kernel tree, dated October 2026, and it's part of the Kernel API Manual, bestie. go forth and group your CPUs 🌈⭐💜