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authorPaul E. McKenney <paul.mckenney@linaro.org>2011-06-18 02:53:19 +0400
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-09-29 08:38:12 +0400
commit29c00b4a1d9e277786120032aa8364631820d863 (patch)
tree23bf0c8cdb5268ef92ef9ed007639705e922b1b0 /include/linux/rcupdate.h
parent9d68197c05201d8edc70d58bd1d5dad05d8455e8 (diff)
downloadlinux-29c00b4a1d9e277786120032aa8364631820d863.tar.xz
rcu: Add event-tracing for RCU callback invocation
There was recently some controversy about the overhead of invoking RCU callbacks. Add TRACE_EVENT()s to obtain fine-grained timings for the start and stop of a batch of callbacks and also for each callback invoked. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/linux/rcupdate.h')
-rw-r--r--include/linux/rcupdate.h50
1 files changed, 0 insertions, 50 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index ae5327de41aa..dd2bc2c6a285 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -794,44 +794,6 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
#define RCU_INIT_POINTER(p, v) \
p = (typeof(*v) __force __rcu *)(v)
-/*
- * 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 */
-
static __always_inline bool __is_kfree_rcu_offset(unsigned long offset)
{
return offset < 4096;
@@ -850,18 +812,6 @@ void __kfree_rcu(struct rcu_head *head, unsigned long offset)
call_rcu(head, (rcu_callback)offset);
}
-extern void kfree(const void *);
-
-static inline void __rcu_reclaim(struct rcu_head *head)
-{
- unsigned long offset = (unsigned long)head->func;
-
- if (__is_kfree_rcu_offset(offset))
- kfree((void *)head - offset);
- else
- head->func(head);
-}
-
/**
* kfree_rcu() - kfree an object after a grace period.
* @ptr: pointer to kfree