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srcu: Crude control of expedited grace periods

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SRCU's implementation of expedited grace periods has always assumed
that the SRCU instance is idle when the expedited request arrives.
This commit improves this a bit by maintaining a count of the number
of outstanding expedited requests, thus allowing prior non-expedited
grace periods accommodate these requests by shifting to expedited mode.
However, any non-expedited wait already in progress will still wait for
the full duration.

Improved control of expedited grace periods is planned, but one step
at a time.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2017-03-24 13:46:33 -07:00
parent 80a7956fe3
commit f60d231a87
2 changed files with 47 additions and 38 deletions
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1
include/linux/srcu.h
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@ -42,6 +42,7 @@ struct srcu_array {
struct srcu_struct {
unsigned long completed;
unsigned long srcu_gp_seq;
atomic_t srcu_exp_cnt;
struct srcu_array __percpu *per_cpu_ref;
spinlock_t queue_lock; /* protect ->srcu_cblist */
struct rcu_segcblist srcu_cblist;