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Release 4.12 include/linux/rcutree.h

Directory: include/linux
 * Read-Copy Update mechanism for mutual exclusion (tree-based version)
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you can access it online at
 * Copyright IBM Corporation, 2008
 * Author: Dipankar Sarma <>
 *         Paul E. McKenney <> Hierarchical algorithm
 * Based on the original work by Paul McKenney <>
 * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
 * For detailed explanation of Read-Copy Update mechanism see -
 *      Documentation/RCU



void rcu_note_context_switch(bool preempt);
int rcu_needs_cpu(u64 basem, u64 *nextevt);
void rcu_cpu_stall_reset(void);

 * Note a virtualization-based context switch.  This is simply a
 * wrapper around rcu_note_context_switch(), which allows TINY_RCU
 * to save a few bytes. The caller must have disabled interrupts.

static inline void rcu_virt_note_context_switch(int cpu) { rcu_note_context_switch(false); }


Gleb Natapov1280.00%150.00%
Paul E. McKenney320.00%150.00%

void synchronize_rcu_bh(void); void synchronize_sched_expedited(void); void synchronize_rcu_expedited(void); void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func); /** * synchronize_rcu_bh_expedited - Brute-force RCU-bh grace period * * Wait for an RCU-bh grace period to elapse, but use a "big hammer" * approach to force the grace period to end quickly. This consumes * significant time on all CPUs and is unfriendly to real-time workloads, * so is thus not recommended for any sort of common-case code. In fact, * if you are using synchronize_rcu_bh_expedited() in a loop, please * restructure your code to batch your updates, and then use a single * synchronize_rcu_bh() instead. * * Note that it is illegal to call this function while holding any lock * that is acquired by a CPU-hotplug notifier. And yes, it is also illegal * to call this function from a CPU-hotplug notifier. Failing to observe * these restriction will result in deadlock. */
static inline void synchronize_rcu_bh_expedited(void) { synchronize_sched_expedited(); }


Paul E. McKenney12100.00%1100.00%

void rcu_barrier(void); void rcu_barrier_bh(void); void rcu_barrier_sched(void); unsigned long get_state_synchronize_rcu(void); void cond_synchronize_rcu(unsigned long oldstate); unsigned long get_state_synchronize_sched(void); void cond_synchronize_sched(unsigned long oldstate); extern unsigned long rcutorture_testseq; extern unsigned long rcutorture_vernum; unsigned long rcu_batches_started(void); unsigned long rcu_batches_started_bh(void); unsigned long rcu_batches_started_sched(void); unsigned long rcu_batches_completed(void); unsigned long rcu_batches_completed_bh(void); unsigned long rcu_batches_completed_sched(void); unsigned long rcu_exp_batches_completed(void); unsigned long rcu_exp_batches_completed_sched(void); void show_rcu_gp_kthreads(void); void rcu_force_quiescent_state(void); void rcu_bh_force_quiescent_state(void); void rcu_sched_force_quiescent_state(void); void rcu_idle_enter(void); void rcu_idle_exit(void); void rcu_irq_enter(void); void rcu_irq_exit(void); void rcu_irq_enter_irqson(void); void rcu_irq_exit_irqson(void); void exit_rcu(void); void rcu_scheduler_starting(void); extern int rcu_scheduler_active __read_mostly; bool rcu_is_watching(void); void rcu_request_urgent_qs_task(struct task_struct *t); void rcu_all_qs(void); /* RCUtree hotplug events */ int rcutree_prepare_cpu(unsigned int cpu); int rcutree_online_cpu(unsigned int cpu); int rcutree_offline_cpu(unsigned int cpu); int rcutree_dead_cpu(unsigned int cpu); int rcutree_dying_cpu(unsigned int cpu); #endif /* __LINUX_RCUTREE_H */

Overall Contributors

Paul E. McKenney28181.21%3186.11%
Thomas Gleixner4613.29%25.56%
Gleb Natapov123.47%12.78%
Lai Jiangshan61.73%12.78%
Boqun Feng10.29%12.78%
Directory: include/linux
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