bfq_update_min(9)

💅 bfq_update_min(9)

okay so bestie, we're in the Kernel API Manual today and this one is literally the glow-up artist for min_start 💖

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✨ NAME ✨

bfq_update_min — update the min_start field of a entity. periodt.

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🌸 SYNOPSIS 🌸

void bfq_update_min (struct bfq_entity *entity , struct rb_node *node );

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🎀 ARGUMENTS 🎀

• entity — the entity to update. yeah. the main character of this whole operation 👑
• node — one of its children. literally just one of the kids 🫶

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🦋 DESCRIPTION 🦋

so here's the vibe check: this function gets called when entity may be storing an invalid value for min_start, and the reason is that the active tree got updated underneath it 😭 like, things moved, bestie, and now that field is giving stale.

the function also assumes that the subtree rooted at node has a valid min_start value — and note that node may be its left or its right child, both are valid, no cap. so don't come at it with a bogus subtree, because it's trusting you on that one fr fr 🙈

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🌈 SEE ALSO 🌈

Kernel file ./block/bfq-wf2q.c — and the whole friend group, because this icon does not function alone:

• bfq_gt(9)
• bfq_update_next_in_service(9)
• bfq_delta(9)
• bfq_calc_finish(9)
• bfq_entity_of(9)
• bfq_extract(9)
• bfq_idle_extract(9)
• bfq_insert(9)
• bfq_update_active_node(9)
• bfq_update_active_tree(9)
• bfq_active_insert(9)
• bfq_ioprio_to_weight(9)
• bfq_weight_to_ioprio(9)
• bfq_find_deepest(9)
• bfq_active_extract(9)
• bfq_idle_insert(9)
• bfq_forget_entity(9)
• bfq_put_idle_entity(9)
• bfq_forget_idle(9)
• bfq_bfqq_served(9)
• bfq_bfqq_charge_time(9)
• __bfq_activate_entity(9)
• __bfq_requeue_entity(9)
• bfq_activate_requeue_entity(9)
• __bfq_deactivate_entity(9)
• bfq_deactivate_entity(9)
• bfq_calc_vtime_jump(9)
• bfq_first_active_entity(9)
• __bfq_lookup_next_entity(9)
• bfq_lookup_next_entity(9)

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aaaand that's the whole page, mwah 💋 this came out of ./block in October 2026 — go stan, iykyk 🧚‍♀️⭐