call_rcu_tasks_trace(9)

✨ call_rcu_tasks_trace ✨

Okay bestie, so this one is from the Kernel API Manual — call_rcu_tasks_trace(9) — and it's honestly giving "queue up your callback and let the kernel handle the timing" 💅

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🎀 NAME 🎀

call_rcu_tasks_trace — Queue a callback trace task-based grace period

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🦋 SYNOPSIS 🦋

void call_rcu_tasks_trace (struct rcu_head *rhp , rcu_callback_t func );

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🌸 ARGUMENTS 🌸

• rhp — the structure to be used for queueing the RCU updates. That's your little parking spot for the request 🅿️✨
• func — the actual callback function to be invoked after the grace period. The main character, fr fr 👑

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💖 DESCRIPTION 💖

So here's the tea ☕ — your callback function gets invoked some time after a trace rcu-tasks grace period elapses. Translation: after all the currently executing trace rcu-tasks read-side critical sections have completed. No cap, that's the whole vibe check ✅

Those read-side critical sections are delimited by calls to rcu_read_lock_trace and rcu_read_unlock_trace — like, that's how they know where one starts and where one ends 🎀

Ok so for the ✨detailed✨ deets on memory ordering guarantees, go peek at the description of call_rcu. It's got the receipts 🔥

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🧚 SEE ALSO 🧚

Kernel file ./include/linux/rcupdate_trace.h

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

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And that's the whole page, bestie 🫶 — brought to you straight out of ./include/linux, Kernel API Manual edition, dated October 2026. Slay, go queue those callbacks 💅🌈⭐