d4c08f2ac3
Add trace events to record grace-period start and end, quiescent states, CPUs noticing grace-period start and end, grace-period initialization, call_rcu() invocation, tasks blocking in RCU read-side critical sections, tasks exiting those same critical sections, force_quiescent_state() detection of dyntick-idle and offline CPUs, CPUs entering and leaving dyntick-idle mode (except from NMIs), CPUs coming online and going offline, and CPUs being kicked for staying in dyntick-idle mode for too long (as in many weeks, even on 32-bit systems). Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> rcu: Add the rcu flavor to callback trace events The earlier trace events for registering RCU callbacks and for invoking them did not include the RCU flavor (rcu_bh, rcu_preempt, or rcu_sched). This commit adds the RCU flavor to those trace events. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/*
|
|
* Read-Copy Update definitions shared among RCU implementations.
|
|
*
|
|
* 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, 2011
|
|
*
|
|
* Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
|
|
*/
|
|
|
|
#ifndef __LINUX_RCU_H
|
|
#define __LINUX_RCU_H
|
|
|
|
#ifdef CONFIG_RCU_TRACE
|
|
#define RCU_TRACE(stmt) stmt
|
|
#else /* #ifdef CONFIG_RCU_TRACE */
|
|
#define RCU_TRACE(stmt)
|
|
#endif /* #else #ifdef CONFIG_RCU_TRACE */
|
|
|
|
/*
|
|
* debug_rcu_head_queue()/debug_rcu_head_unqueue() are used internally
|
|
* by call_rcu() and rcu callback execution, and are therefore not part of the
|
|
* RCU API. Leaving in rcupdate.h because they are used by all RCU flavors.
|
|
*/
|
|
|
|
#ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD
|
|
# define STATE_RCU_HEAD_READY 0
|
|
# define STATE_RCU_HEAD_QUEUED 1
|
|
|
|
extern struct debug_obj_descr rcuhead_debug_descr;
|
|
|
|
static inline void debug_rcu_head_queue(struct rcu_head *head)
|
|
{
|
|
WARN_ON_ONCE((unsigned long)head & 0x3);
|
|
debug_object_activate(head, &rcuhead_debug_descr);
|
|
debug_object_active_state(head, &rcuhead_debug_descr,
|
|
STATE_RCU_HEAD_READY,
|
|
STATE_RCU_HEAD_QUEUED);
|
|
}
|
|
|
|
static inline void debug_rcu_head_unqueue(struct rcu_head *head)
|
|
{
|
|
debug_object_active_state(head, &rcuhead_debug_descr,
|
|
STATE_RCU_HEAD_QUEUED,
|
|
STATE_RCU_HEAD_READY);
|
|
debug_object_deactivate(head, &rcuhead_debug_descr);
|
|
}
|
|
#else /* !CONFIG_DEBUG_OBJECTS_RCU_HEAD */
|
|
static inline void debug_rcu_head_queue(struct rcu_head *head)
|
|
{
|
|
}
|
|
|
|
static inline void debug_rcu_head_unqueue(struct rcu_head *head)
|
|
{
|
|
}
|
|
#endif /* #else !CONFIG_DEBUG_OBJECTS_RCU_HEAD */
|
|
|
|
extern void kfree(const void *);
|
|
|
|
static inline void __rcu_reclaim(char *rn, struct rcu_head *head)
|
|
{
|
|
unsigned long offset = (unsigned long)head->func;
|
|
|
|
if (__is_kfree_rcu_offset(offset)) {
|
|
RCU_TRACE(trace_rcu_invoke_kfree_callback(rn, head, offset));
|
|
kfree((void *)head - offset);
|
|
} else {
|
|
RCU_TRACE(trace_rcu_invoke_callback(rn, head));
|
|
head->func(head);
|
|
}
|
|
}
|
|
|
|
#endif /* __LINUX_RCU_H */
|