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1 | /* |
2 | * Read-Copy Update mechanism for mutual exclusion (tree-based version) |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License as published by |
6 | * the Free Software Foundation; either version 2 of the License, or |
7 | * (at your option) any later version. |
8 | * |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | * GNU General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write to the Free Software |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
17 | * |
18 | * Copyright IBM Corporation, 2008 |
19 | * |
20 | * Author: Dipankar Sarma <dipankar@in.ibm.com> |
21 | * Paul E. McKenney <paulmck@linux.vnet.ibm.com> Hierarchical algorithm |
22 | * |
23 | * Based on the original work by Paul McKenney <paulmck@us.ibm.com> |
24 | * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen. |
25 | * |
26 | * For detailed explanation of Read-Copy Update mechanism see - |
27 | * Documentation/RCU |
28 | */ |
29 | |
30 | #ifndef __LINUX_RCUTREE_H |
31 | #define __LINUX_RCUTREE_H |
32 | |
33 | extern void rcu_init(void); |
34 | extern void rcu_note_context_switch(int cpu); |
35 | extern int rcu_needs_cpu(int cpu, unsigned long *delta_jiffies); |
36 | extern void rcu_cpu_stall_reset(void); |
37 | |
38 | /* |
39 | * Note a virtualization-based context switch. This is simply a |
40 | * wrapper around rcu_note_context_switch(), which allows TINY_RCU |
41 | * to save a few bytes. |
42 | */ |
43 | static inline void rcu_virt_note_context_switch(int cpu) |
44 | { |
45 | rcu_note_context_switch(cpu); |
46 | } |
47 | |
48 | extern void synchronize_rcu_bh(void); |
49 | extern void synchronize_sched_expedited(void); |
50 | extern void synchronize_rcu_expedited(void); |
51 | |
52 | void kfree_call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu)); |
53 | |
54 | /** |
55 | * synchronize_rcu_bh_expedited - Brute-force RCU-bh grace period |
56 | * |
57 | * Wait for an RCU-bh grace period to elapse, but use a "big hammer" |
58 | * approach to force the grace period to end quickly. This consumes |
59 | * significant time on all CPUs and is unfriendly to real-time workloads, |
60 | * so is thus not recommended for any sort of common-case code. In fact, |
61 | * if you are using synchronize_rcu_bh_expedited() in a loop, please |
62 | * restructure your code to batch your updates, and then use a single |
63 | * synchronize_rcu_bh() instead. |
64 | * |
65 | * Note that it is illegal to call this function while holding any lock |
66 | * that is acquired by a CPU-hotplug notifier. And yes, it is also illegal |
67 | * to call this function from a CPU-hotplug notifier. Failing to observe |
68 | * these restriction will result in deadlock. |
69 | */ |
70 | static inline void synchronize_rcu_bh_expedited(void) |
71 | { |
72 | synchronize_sched_expedited(); |
73 | } |
74 | |
75 | extern void rcu_barrier(void); |
76 | extern void rcu_barrier_bh(void); |
77 | extern void rcu_barrier_sched(void); |
78 | |
79 | extern unsigned long rcutorture_testseq; |
80 | extern unsigned long rcutorture_vernum; |
81 | extern long rcu_batches_completed(void); |
82 | extern long rcu_batches_completed_bh(void); |
83 | extern long rcu_batches_completed_sched(void); |
84 | |
85 | extern void rcu_force_quiescent_state(void); |
86 | extern void rcu_bh_force_quiescent_state(void); |
87 | extern void rcu_sched_force_quiescent_state(void); |
88 | |
89 | extern void rcu_scheduler_starting(void); |
90 | extern int rcu_scheduler_active __read_mostly; |
91 | |
92 | #endif /* __LINUX_RCUTREE_H */ |
93 |
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