resctrl_arch...ontext_check(9)

💅 NAME 💅

resctrl_arch...ontext_check — the little function that just warns you when your context is invalid, bestie. That's it. That's the whole job. ✨

Oh and hi, welcome to the Kernel API Manual — you're gonna love it here 🫶

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🌸 SYNOPSIS 🌸

void resctrl_arch_rmid_read_context_check (void );

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🎀 ARGUMENTS 🎀

• void — literally no arguments. nothing. zero. the void is empty, she takes nothing, she gives warnings 💀

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🦋 DESCRIPTION 🦋

okay so here's the tea ☕ — when the kernel is built with CONFIG_DEBUG_ATOMIC_SLEEP, this function will generate a warning whenever resctrl_arch_rmid_read gets called with preemption disabled. like, it's not mad, it's just disappointed 😭

The contract with resctrl_arch_rmid_read is that if interrupts are unmasked, it can sleep. Read that again, it matters 👑

This is what lets NOHZ_FULL systems use an IPI — and fail if the call needed to sleep — while most of the time the work is scheduled, which lets the call sleep. best of both worlds, no cap 💖

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🔥 SEE ALSO 🔥

Kernel file ./include/linux/resctrl.h — and like, the whole friend group:

• 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)
• 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_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)

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and that's the whole page, omg we ate that up 💅✨ this one lives in ./include/linux, dated October 2026, and it's brought to you by resctrl_arch...ontext_check(9) — mwah, see u in the source tree bestie 🧚💜