blkcg_maybe_...ttle_current(9)

💅 blkcg_maybe_throttle_current(9) — like, the Kernel API Manual, bestie ✨

okay so this is a page from the Kernel API Manual, section 9, and the function we're stanning today is blkcg_maybe_throttle_current 🎀 buckle up, it's short but it's important.

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🌸 NAME 🌸

blkcg_maybe_throttle_current — throttles the current task if it's been marked. that's it. that's the whole vibe 🫶

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✨ SYNOPSIS ✨

void blkcg_maybe_throttle_current (void );

literally no args, no drama, just vibes 💅

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🦋 ARGUMENTS 🦋

• void — no arguments. nothing. nada. zero. the function said "i need nothing from you" and honestly? iconic 👑

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💖 DESCRIPTION 💖

okay so here's the tea, bestie ☕ this one is only called if we've been marked with set_notify_resume. and like… obviously we can be set_notify_resume for reasons that have nothing to do with blkcg throttling (it's giving "not everything is about you" energy 😭), so the function does a little vibe check first: it looks at whether current->throttle_disk is set, and if it's not set, this whole thing just… does nothing. no cap. 🫥

⚠️ lowkey the most important part: this should only ever be called by the resume code. it is not meant to be called by people willy-nilly 🚫 — because it will actually do the work to throttle the task if that task is set up for throttling. so please don't just call it for fun. that's not the move, bestie. 💀

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🔥 SEE ALSO 🔥

kernel file ./block/blk-cgroup.c — and here's the whole friend group, all present and accounted for 🧚:

• blkcg_css(9)
• blkg_free(9)
• bio_blkcg_css(9)
• blkcg_parent(9)
• blkg_alloc(9)
• blkg_lookup_create(9)
• blkcg_print_blkgs(9)
• __blkg_prfill_u64(9)
• blkg_conf_init(9)
• blkg_conf_open_bdev(9)
• blkg_conf_prep(9)
• blkg_conf_unprep(9)
• blkg_conf_close_bdev(9)
• blkcg_destroy_blkgs(9)
• blkcg_pin_online(9)
• blkcg_unpin_online(9)
• blkcg_css_offline(9)
• blkcg_activate_policy(9)
• blkcg_deactivate_policy(9)
• blkcg_policy_register(9)
• blkcg_policy_unregister(9)
• blkcg_schedule_throttle(9)
• blkcg_add_delay(9)
• blkg_tryget_closest(9)
• bio_associate_blkg_from_css(9)
• bio_associate_blkg(9)
• bio_clone_blkg_association(9)

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and that's the whole page, bestie 🌈 sourced from ./block, dated October 2026 — mwah, go read the kernel source, ily, bye 💋🎀✨