synchronize_rcu_tasks_trace(9)

✨ synchronize_rcu_tasks_trace(9) — from the Kernel API Manual bestie 💅

okay so picture this: you're deep in the kernel, you need to wait, and not just any wait — a trace rcu-tasks grace period wait. that's this function. she's niche, she's specific, and she absolutely ate. let's get into it 🎀

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🌸 NAME 🌸

synchronize_rcu_tasks_trace — literally just: wait for a trace rcu-tasks grace period. that's the whole vibe. no cap.

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✨ SYNOPSIS ✨

void synchronize_rcu_tasks_trace (void );

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🫶 ARGUMENTS 🫶

• void — no arguments. none. zero. she takes nothing and gives you a grace period. iconic behaviour honestly 💖

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🦋 DESCRIPTION 🦋

so here's the tea ☕ — control hands itself back to you (the caller) some time after a trace rcu-tasks grace period has elapsed. and by "a grace period has elapsed" we mean: after all currently executing trace rcu-tasks read-side critical sections have wrapped up. every single one. no stragglers. 🔥

those read-side critical sections? they're delimited (fancy word for "bookended," iykyk) by calls to rcu_read_lock_trace and rcu_read_unlock_trace. lock it, unlock it, that's the section. periodt.

💀 real talk though: this is a very specialized primitive. like, extremely. it's intended only for a few uses in tracing and other situations requiring manipulation of function preambles and profiling hooks. so don't just sprinkle her around like glitter — she's a main character with a very specific role.

and ngl, synchronize_rcu_tasks_trace is not (yet) intended for heavy use from multiple CPUs. that "(yet)" is doing a lot of work, bestie — respect it. 🙈

want the full lore on memory ordering guarantees? go read the description of synchronize_rcu. she's the big sister and she explains it all. 📖

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👑 SEE ALSO 👑

Kernel file ./include/linux/rcupdate_trace.h — go look, she has friends:

• rcu_read_lock_tasks_trace(9)
• rcu_read_unlock_tasks_trace(9)
• rcu_read_lock_trace(9)
• rcu_read_unlock_trace(9)
• call_rcu_tasks_trace(9)
• rcu_barrier_tasks_trace(9)
• rcu_tasks_trace_expedite_current(9)

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🌈 and that's the page!! sourced from ./include/linux, dated October 2026, filed under synchronize_rcu_tasks_trace(9) — mwah 💋 go wait on your grace period responsibly, bestie. slay 🫶✨