STRUCT RESCTRL_MEMBW(9)

💖 NAME 💖

struct resctrl_membw — the memory bandwidth allocation data bundle, straight out of the Kernel API Manual bestie, and yes it's exactly as iconic as it sounds 🎀

✨ SYNOPSIS ✨

struct resctrl_membw {
    u32 min_bw;
    u32 max_bw;
    u32 bw_gran;
    u32 delay_linear;
    bool arch_needs_linear;
    enum membw_throttle_mode        throttle_mode;
    bool mba_sc;
    u32 *mb_map;
 };

🦋 Members 🦋

okay so this struct is literally the whole vibe check for memory bandwidth, and here's every single field, no cap:

• min_bw — the minimum memory bandwidth percentage that a user is allowed to ask for. floor energy 📉
• max_bw — the maximum memory bandwidth value, and it's also the reset value. so it's giving main character and backup dancer at the same time 💅
• bw_gran — the granularity at which the memory bandwidth actually gets allocated. the chunk size, if you will ✨
• delay_linear — True if the memory B/W delay is on a linear scale. so like, straight line vibes 📏
• arch_needs_linear — True if we literally can't configure non-linear resources. no wiggle room, the architecture said what it said 🙈
• throttle_mode — the bandwidth throttling mode used when threads are requesting different memory bandwidths. drama between threads, basically 💀
• mba_sc — True if the MBA software controller (mba_sc) is enabled. she's awake and she's working 🫶
• mb_map — the mapping of memory B/W percentage → memory B/W delay. the translation layer, the interpreter, the go-between 🌈

👑 SEE ALSO 👑

Kernel file ./include/linux/resctrl.h — go read it, it's the source of truth fr fr 🧚

and then the whole extended friend group, all present and accounted for:

• enum resctrl_conf_type(9)
• struct resctrl_staged_config(9)
• struct rdt_domain_hdr(9)
• struct rdt_ctrl_domain(9)
• struct mbm_cntr_cfg(9)
• struct rdt_l3_mon_domain(9)
• struct resctrl_cache(9)
• enum membw_throttle_mode(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)

that's the whole page bestie, every field, every reference, nothing skipped 💖 go forth and allocate your bandwidth responsibly ✨

and yeah, this lil page lives in ./include/linux and it's dated October 2026 — future queen behavior honestly 👑🌸 slay, see u in the next manpage 🫶