throtl_pending_timer_fn(9)

💅 throtl_pending_timer_fn — a little intro, bestie 🎀

Okay so this one's from the Kernel API Manual (yes, the real one, section 9, very official 💖) and it's literally the timer function for service_queue->pending_timer. That's the whole vibe. Let's get into it ✨

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✨ NAME ✨

throtl_pending_timer_fn — timer function for service_queue->pending_timer 🕰️

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🦋 SYNOPSIS 🦋

void throtl_pending_timer_fn (struct timer_list *t );

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🌸 ARGUMENTS 🌸

• t — the pending_timer member of the throtl_service_queue being serviced 💫

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👑 DESCRIPTION 👑

So picture this: a child throtl_grp with active bio's becomes pending and gets queued on the service_queue's pending_tree. That's when this timer gets armed — like, it's on, it's waiting, it's giving scheduled main character energy ⏳✨ And it expires right when the first child throtl_grp should be dispatched. Iconic.

When it fires, this function dispatches bio's from the children throtl_grps to the parent service_queue. Passing the bio's up the chain, no cap 🔥

Now here's the slay part: if the parent's parent is another throtl_grp, the dispatching gets propagated — either by arming its pending_timer or by just repeating the dispatch directly. Two paths, both valid, we love options 💅

And if the top-level service_tree is reached? Then throtl_data->dispatch_work gets kicked so that the ready bio's are issued. That's the final boss, the whole point, periodt 🎯👑

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🫶 SEE ALSO 🫶

Kernel file ./block/blk-throttle.c

• sq_to_tg(9)
• sq_to_td(9)
• throtl_log(9)
• throtl_qnode_add_bio(9)
• throtl_peek_queued(9)
• throtl_pop_queued(9)
• throtl_schedule_next_dispatch(9)
• throtl_add_bio_tg(9)
• blk_throtl_dispatch_work_fn(9)

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ngl bestie, if you're poking at blk-throttle internals you should fr fr read the ones above too, they're the whole friend group 🌈

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Okay that's the whole page, mwah 💋 This little gem lives over in ./block, blessed us in October 2026, and that's the sign-off — go forth and dispatch those bio's, queen 🧚‍♀️⭐💜