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[PATCH] rcutorture: add call_rcu_bh() operations

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Add operations for the call_rcu_bh() variant of RCU.  Also add an
rcu_batches_completed_bh() function, which is needed by rcutorture.

Signed-off-by: Paul E. McKenney <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paul E. McKenney 2006-06-27 02:54:04 -07:00 committed by Linus Torvalds
parent 72e9bb5492
commit c32e066057
3 changed files with 49 additions and 2 deletions
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1
include/linux/rcupdate.h
View file

@ -258,6 +258,7 @@ extern void rcu_init(void);
extern void rcu_check_callbacks(int cpu, int user);
extern void rcu_restart_cpu(int cpu);
extern long rcu_batches_completed(void);
extern long rcu_batches_completed_bh(void);
/* Exported interfaces */
extern void FASTCALL(call_rcu(struct rcu_head *head,

10
kernel/rcupdate.c
View file

@ -182,6 +182,15 @@ long rcu_batches_completed(void)
return rcu_ctrlblk.completed;
}
/*
* Return the number of RCU batches processed thus far. Useful
* for debug and statistics.
*/
long rcu_batches_completed_bh(void)
{
return rcu_bh_ctrlblk.completed;
}
static void rcu_barrier_callback(struct rcu_head *notused)
{
if (atomic_dec_and_test(&rcu_barrier_cpu_count))
@ -619,6 +628,7 @@ module_param(qlowmark, int, 0);
module_param(rsinterval, int, 0);
#endif
EXPORT_SYMBOL_GPL(rcu_batches_completed);
EXPORT_SYMBOL_GPL(rcu_batches_completed_bh);
EXPORT_SYMBOL_GPL(call_rcu);
EXPORT_SYMBOL_GPL(call_rcu_bh);
EXPORT_SYMBOL_GPL(synchronize_rcu);

40
kernel/rcutorture.c
View file

@ -66,7 +66,7 @@ MODULE_PARM_DESC(test_no_idle_hz, "Test support for tickless idle CPUs");
module_param(shuffle_interval, int, 0);
MODULE_PARM_DESC(shuffle_interval, "Number of seconds between shuffles");
module_param(torture_type, charp, 0);
MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu)");
MODULE_PARM_DESC(torture_type, "Type of RCU to torture (rcu, rcu_bh)");
#define TORTURE_FLAG "-torture:"
#define PRINTK_STRING(s) \
@ -246,8 +246,44 @@ static struct rcu_torture_ops rcu_ops = {
.name = "rcu"
};
/*
* Definitions for rcu_bh torture testing.
*/
static int rcu_bh_torture_read_lock(void)
{
rcu_read_lock_bh();
return 0;
}
static void rcu_bh_torture_read_unlock(int idx)
{
rcu_read_unlock_bh();
}
static int rcu_bh_torture_completed(void)
{
return rcu_batches_completed_bh();
}
static void rcu_bh_torture_deferred_free(struct rcu_torture *p)
{
call_rcu_bh(&p->rtort_rcu, rcu_torture_cb);
}
static struct rcu_torture_ops rcu_bh_ops = {
.init = NULL,
.cleanup = NULL,
.readlock = rcu_bh_torture_read_lock,
.readunlock = rcu_bh_torture_read_unlock,
.completed = rcu_bh_torture_completed,
.deferredfree = rcu_bh_torture_deferred_free,
.stats = NULL,
.name = "rcu_bh"
};
static struct rcu_torture_ops *torture_ops[] =
{ &rcu_ops, NULL };
{ &rcu_ops, &rcu_bh_ops, NULL };
/*
* RCU torture writer kthread. Repeatedly substitutes a new structure