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rcu: Provide rcu_expedite_gp() and rcu_unexpedite_gp()

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Currently, expediting of normal synchronous grace-period primitives
(synchronize_rcu() and friends) is controlled by the rcu_expedited()
boot/sysfs parameter.  This works well, but does not handle nesting.
This commit therefore provides rcu_expedite_gp() to enable expediting
and rcu_unexpedite_gp() to cancel a prior rcu_expedite_gp(), both of
which support nesting.

Reported-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2015-02-18 12:24:30 -08:00
parent c517d838eb
commit 0d39482c3d
2 changed files with 68 additions and 0 deletions
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20
include/linux/rcupdate.h
View file

@ -48,6 +48,26 @@
extern int rcu_expedited; /* for sysctl */
#ifdef CONFIG_TINY_RCU
/* Tiny RCU doesn't expedite, as its purpose in life is instead to be tiny. */
static inline bool rcu_gp_is_expedited(void) /* Internal RCU use. */
{
return false;
}
static inline void rcu_expedite_gp(void)
{
}
static inline void rcu_unexpedite_gp(void)
{
}
#else /* #ifdef CONFIG_TINY_RCU */
bool rcu_gp_is_expedited(void); /* Internal RCU use. */
void rcu_expedite_gp(void);
void rcu_unexpedite_gp(void);
#endif /* #else #ifdef CONFIG_TINY_RCU */
enum rcutorture_type {
RCU_FLAVOR,
RCU_BH_FLAVOR,