scx_rescue_keep(9)

💖 NAME 💖

scx_rescue_keep — from the Kernel API Manual — is literally here to keep the rescue going for a preempted-out rescuee. Bestie, it's the “wait, don’t end the rescue yet” vibe check. 🫶

✨ SYNOPSIS ✨

bool scx_rescue_keep (struct rq *rq , struct task_struct *p );

🎀 ARGUMENTS 🎀

• rq — the rq that p is running on.
• p — the task under rescue whose slice is exhausted. 😭

🌸 DESCRIPTION 🌸

okay so picture this: this function gets called from put_prev_task_scx, and its whole job is deciding what an exhausted slice means for the rescuee. 👑

scx_rescue_charge ends the rescue the moment the admitted slice is fully served. So if we arrive here and the rescue is still open? That means p was preempted. Not me being dramatic, that’s just the read. 💅

In that case, restore the unserved remainder and return true — p stays the rescuee, and the caller reinserts it at the tail of the local DSQ, behind whatever preempted the rescuee. Yes, behind. Queue etiquette. 🎀

Return false to end the rescue instead: the slice is already fully served, p is leaving the rq, or bypass is dismantling rescues. That’s the “rescue over, bestie” path. 🦋

no cap: true = keep the rescue rolling; false = end it. The details above are the whole vibe check. 💖

🔗 SEE ALSO 🔗

Kernel file: ./kernel/sched/ext/sub.c

• scx_skip_subtree_pre(9)
• scx_next_descendant_pre(9)
• scx_rescue_charge(9)
• scx_rescue_end(9)
• scx_rescue_accrue(9)
• scx_rescue_admit(9)
• scx_rescue_try_admit(9)
• scx_rescue_check_overload(9)
• scx_rescue_timerfn(9)
• scx_resolve_local_dsq(9)
• queue_sync_ecaps(9)
• scx_process_sync_ecaps(9)
• scx_unbypass_replay_ecaps(9)
• scx_discard_stale_ecaps_syncs(9)
• scx_rehome_task(9)
• scx_punt_task(9)
• scx_cgroup_claim_subtree(9)
• scx_cgroup_return_subtree(9)
• scx_cgroup_task_migrating(9)
• scx_cgroup_task_migrated(9)
• scx_cgroup_task_migrate_canceled(9)
• scx_bpf_sub_dispatch(9)
• scx_bpf_sub_grant(9)
• scx_bpf_sub_revoke(9)
• scx_bpf_sub_caps(9)
• scx_bpf_sub_kill_bstr(9)

source/version: ./kernel/sched/ext · date: October 2026 · page: scx_rescue_keep(9) — mwah, bestie, go keep those rescues cute and correct 💋✨