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105 lines
3.6 KiB
105 lines
3.6 KiB
/* |
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* Read-Copy Update mechanism for mutual exclusion (tree-based version) |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, you can access it online at |
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* http://www.gnu.org/licenses/gpl-2.0.html. |
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* |
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* Copyright IBM Corporation, 2008 |
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* |
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* Author: Dipankar Sarma <dipankar@in.ibm.com> |
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* Paul E. McKenney <paulmck@linux.vnet.ibm.com> Hierarchical algorithm |
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* |
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* Based on the original work by Paul McKenney <paulmck@us.ibm.com> |
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* and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen. |
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* |
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* For detailed explanation of Read-Copy Update mechanism see - |
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* Documentation/RCU |
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*/ |
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#ifndef __LINUX_RCUTREE_H |
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#define __LINUX_RCUTREE_H |
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void rcu_note_context_switch(bool preempt); |
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int rcu_needs_cpu(u64 basem, u64 *nextevt); |
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void rcu_cpu_stall_reset(void); |
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/* |
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* Note a virtualization-based context switch. This is simply a |
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* wrapper around rcu_note_context_switch(), which allows TINY_RCU |
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* to save a few bytes. The caller must have disabled interrupts. |
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*/ |
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static inline void rcu_virt_note_context_switch(int cpu) |
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{ |
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rcu_note_context_switch(false); |
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} |
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void synchronize_rcu_bh(void); |
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void synchronize_sched_expedited(void); |
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void synchronize_rcu_expedited(void); |
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void kfree_call_rcu(struct rcu_head *head, rcu_callback_t func); |
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/** |
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* synchronize_rcu_bh_expedited - Brute-force RCU-bh grace period |
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* |
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* Wait for an RCU-bh grace period to elapse, but use a "big hammer" |
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* approach to force the grace period to end quickly. This consumes |
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* significant time on all CPUs and is unfriendly to real-time workloads, |
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* so is thus not recommended for any sort of common-case code. In fact, |
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* if you are using synchronize_rcu_bh_expedited() in a loop, please |
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* restructure your code to batch your updates, and then use a single |
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* synchronize_rcu_bh() instead. |
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* |
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* Note that it is illegal to call this function while holding any lock |
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* that is acquired by a CPU-hotplug notifier. And yes, it is also illegal |
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* to call this function from a CPU-hotplug notifier. Failing to observe |
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* these restriction will result in deadlock. |
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*/ |
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static inline void synchronize_rcu_bh_expedited(void) |
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{ |
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synchronize_sched_expedited(); |
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} |
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void rcu_barrier(void); |
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void rcu_barrier_bh(void); |
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void rcu_barrier_sched(void); |
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unsigned long get_state_synchronize_rcu(void); |
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void cond_synchronize_rcu(unsigned long oldstate); |
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unsigned long get_state_synchronize_sched(void); |
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void cond_synchronize_sched(unsigned long oldstate); |
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void rcu_idle_enter(void); |
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void rcu_idle_exit(void); |
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void rcu_irq_enter(void); |
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void rcu_irq_exit(void); |
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void rcu_irq_enter_irqson(void); |
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void rcu_irq_exit_irqson(void); |
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bool rcu_irq_enter_disabled(void); |
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void exit_rcu(void); |
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void rcu_scheduler_starting(void); |
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extern int rcu_scheduler_active __read_mostly; |
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void rcu_end_inkernel_boot(void); |
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bool rcu_is_watching(void); |
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void rcu_all_qs(void); |
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/* RCUtree hotplug events */ |
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int rcutree_prepare_cpu(unsigned int cpu); |
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int rcutree_online_cpu(unsigned int cpu); |
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int rcutree_offline_cpu(unsigned int cpu); |
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int rcutree_dead_cpu(unsigned int cpu); |
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int rcutree_dying_cpu(unsigned int cpu); |
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#endif /* __LINUX_RCUTREE_H */
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