scx_propaga...t_irq_workfn(9)

📦 version 7.3.1, in nixpkgs unstable

✨ scx_propagate_exit_irq_workfn 💅

okay bestie so this is a page from the Kernel API Manual, section 9 — yes, the big serious kernel-functions section, but we're gonna make it make sense. 🫶

It's literally the manual page for scx_propagate_exit_irq_workfn, and honestly the name is a mouthful so let's just call it "the propagate-exit irq work fn" in our heads, mwah. 💖

🌸 NAME 🌸

scx_propagate_exit_irq_workfn — claim SCX_EXIT_PARENT on the exiting subtree. that's it, that's the whole gig. 👑

🎀 SYNOPSIS 🎀

void scx_propagate_exit_irq_workfn (struct irq_work *irq_work );

like, one arg, returns nothing, no cap. 💅

🦋 ARGUMENTS 🦋

  • irq_work — this bad boy right here is scx_sched.propagate_exit_irq_work. that exact field. don't @ me. ✨

🔥 DESCRIPTION 🔥

so here's the tea, bestie. this function gets queued by scx_claim_exit after a non-PARENT claim. 🫖 that's the context, that's where it comes from.

once it runs, it claims SCX_EXIT_PARENT on each descendant, which is giving every single one of them its own disable work. iconic behavior honestly. 👑

and the way that works is: most of the disabling is serialized, but ops.exit can take arbitrarily long 😭 — like, no upper bound, it's just out here living its life — so running them in separate helper kthreads is what actually parallelizes it. main character scheduling energy fr fr. 🔥

and the best part? no recursion, because only non-PARENT claims propagate. so it doesn't just keep going down forever like a group chat at 3am. 💀

🌈 SEE ALSO 🌈

the kernel file is ./kernel/sched/ext/ext.c btw — that's your source of truth, go look 🕵️‍♀️

and here's the whole friend group, alphabetically-ish, all of them (9) pages, all of them relevant, all of them invited to the party 🎉:

like I said. whole friend group. 💜

ngl if you're reading this page you're probably already deep in ./kernel/sched/ext and there's no going back, so hydrate and open the source file, bestie 🍓

alright that's the whole page, mwah 💋 — this cutie came out of ./kernel/sched/ext, dated October 2026, and it lives at scx_propaga...t_irq_workfn(9) in the Kernel API Manual (that's the truncated name, blame the column width not me 🙈). go be iconic with your irq work. 🧚✨

📦 where this page comes from