scx_bpf_tid_to_task(9)

📦 version 7.3.1, in nixpkgs unstable

💅 scx_bpf_tid_to_task — like, the Kernel API Manual, bestie ✨

okay so real talk, this page lives in the Kernel API Manual (scx_bpf_tid_to_task(9)) and it's genuinely short and sweet. no cap, it's a little lookup function and it ate. let's go 🫶

🌸 NAME 🌸

scx_bpf_tid_to_task — look up a task by its scx tid. that's it. that's the whole vibe. 🎀

✨ SYNOPSIS ✨

__bpf_kfunc struct task_struct * scx_bpf_tid_to_task (u64 tid );

literally just that one line, bestie. she's compact. 💅

🦋 ARGUMENTS 🦋

  • tid — the task ID you already grabbed earlier by reading p->scx.tid. yep, that exact field. don't go making one up, iykyk 🙈

💖 DESCRIPTION 💖

so you hand her a tid and she gives you back the task with that tid. iconic. if no such task exists? you get NULL. nothing, nada, empty-handed 😭

the returned pointer is valid until the end of the current RCU read section (KF_RCU_PROTECTED). like, she's yours for this RCU read section and only this RCU read section — after that she's gone, don't be weird about it. ⭐

also, heads up: this requires SCX_OPS_TID_TO_TASK to be set on the root scheduler. if it isn't, an error is raised and NULL is returned. so yeah, vibe check failed, no task for you 💀

✨ tl;dr bestie: right tid → your task. wrong tid → NULL. missing SCX_OPS_TID_TO_TASK → error and NULL. don't say i didn't warn you 🎀

👑 SEE ALSO 👑

okay this is the part where the page absolutely spills — the source of all this is the kernel file ./kernel/sched/ext/ext.c, and here's the whole friend group, no cap, every single one of them:

like… the whole roster showed up to the group chat. main character energy from every single one 🔥

and that's the page!! 💜 this little cutie is from the source ./kernel/sched/ext, dated October 2026, and she answers to scx_bpf_tid_to_task(9). mwah, go look up your tasks responsibly, bestie 🧚💖

📦 where this page comes from