mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 04:03:58 +08:00
b8ae30ee26
* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (49 commits) stop_machine: Move local variable closer to the usage site in cpu_stop_cpu_callback() sched, wait: Use wrapper functions sched: Remove a stale comment ondemand: Make the iowait-is-busy time a sysfs tunable ondemand: Solve a big performance issue by counting IOWAIT time as busy sched: Intoduce get_cpu_iowait_time_us() sched: Eliminate the ts->idle_lastupdate field sched: Fold updating of the last_update_time_info into update_ts_time_stats() sched: Update the idle statistics in get_cpu_idle_time_us() sched: Introduce a function to update the idle statistics sched: Add a comment to get_cpu_idle_time_us() cpu_stop: add dummy implementation for UP sched: Remove rq argument to the tracepoints rcu: need barrier() in UP synchronize_sched_expedited() sched: correctly place paranioa memory barriers in synchronize_sched_expedited() sched: kill paranoia check in synchronize_sched_expedited() sched: replace migration_thread with cpu_stop stop_machine: reimplement using cpu_stop cpu_stop: implement stop_cpu[s]() sched: Fix select_idle_sibling() logic in select_task_rq_fair() ...
129 lines
3.3 KiB
C
129 lines
3.3 KiB
C
/*
|
|
* 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
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* 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, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
* Copyright IBM Corporation, 2008
|
|
*
|
|
* Author: Dipankar Sarma <dipankar@in.ibm.com>
|
|
* Paul E. McKenney <paulmck@linux.vnet.ibm.com> Hierarchical algorithm
|
|
*
|
|
* Based on the original work by Paul McKenney <paulmck@us.ibm.com>
|
|
* and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
|
|
*
|
|
* For detailed explanation of Read-Copy Update mechanism see -
|
|
* Documentation/RCU
|
|
*/
|
|
|
|
#ifndef __LINUX_RCUTREE_H
|
|
#define __LINUX_RCUTREE_H
|
|
|
|
struct notifier_block;
|
|
|
|
extern void rcu_sched_qs(int cpu);
|
|
extern void rcu_bh_qs(int cpu);
|
|
extern void rcu_note_context_switch(int cpu);
|
|
extern int rcu_needs_cpu(int cpu);
|
|
|
|
#ifdef CONFIG_TREE_PREEMPT_RCU
|
|
|
|
extern void __rcu_read_lock(void);
|
|
extern void __rcu_read_unlock(void);
|
|
extern void synchronize_rcu(void);
|
|
extern void exit_rcu(void);
|
|
|
|
/*
|
|
* Defined as macro as it is a very low level header
|
|
* included from areas that don't even know about current
|
|
*/
|
|
#define rcu_preempt_depth() (current->rcu_read_lock_nesting)
|
|
|
|
#else /* #ifdef CONFIG_TREE_PREEMPT_RCU */
|
|
|
|
static inline void __rcu_read_lock(void)
|
|
{
|
|
preempt_disable();
|
|
}
|
|
|
|
static inline void __rcu_read_unlock(void)
|
|
{
|
|
preempt_enable();
|
|
}
|
|
|
|
#define synchronize_rcu synchronize_sched
|
|
|
|
static inline void exit_rcu(void)
|
|
{
|
|
}
|
|
|
|
static inline int rcu_preempt_depth(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* #else #ifdef CONFIG_TREE_PREEMPT_RCU */
|
|
|
|
static inline void __rcu_read_lock_bh(void)
|
|
{
|
|
local_bh_disable();
|
|
}
|
|
static inline void __rcu_read_unlock_bh(void)
|
|
{
|
|
local_bh_enable();
|
|
}
|
|
|
|
extern void call_rcu_sched(struct rcu_head *head,
|
|
void (*func)(struct rcu_head *rcu));
|
|
extern void synchronize_rcu_bh(void);
|
|
extern void synchronize_sched(void);
|
|
extern void synchronize_rcu_expedited(void);
|
|
|
|
static inline void synchronize_rcu_bh_expedited(void)
|
|
{
|
|
synchronize_sched_expedited();
|
|
}
|
|
|
|
extern void rcu_check_callbacks(int cpu, int user);
|
|
|
|
extern long rcu_batches_completed(void);
|
|
extern long rcu_batches_completed_bh(void);
|
|
extern long rcu_batches_completed_sched(void);
|
|
extern void rcu_force_quiescent_state(void);
|
|
extern void rcu_bh_force_quiescent_state(void);
|
|
extern void rcu_sched_force_quiescent_state(void);
|
|
|
|
#ifdef CONFIG_NO_HZ
|
|
void rcu_enter_nohz(void);
|
|
void rcu_exit_nohz(void);
|
|
#else /* CONFIG_NO_HZ */
|
|
static inline void rcu_enter_nohz(void)
|
|
{
|
|
}
|
|
static inline void rcu_exit_nohz(void)
|
|
{
|
|
}
|
|
#endif /* CONFIG_NO_HZ */
|
|
|
|
/* A context switch is a grace period for RCU-sched and RCU-bh. */
|
|
static inline int rcu_blocking_is_gp(void)
|
|
{
|
|
return num_online_cpus() == 1;
|
|
}
|
|
|
|
extern void rcu_scheduler_starting(void);
|
|
extern int rcu_scheduler_active __read_mostly;
|
|
|
|
#endif /* __LINUX_RCUTREE_H */
|