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[PATCH] rcu: add sched torture type to rcutorture

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Implement torture testing for the "sched" variant of RCU, which uses
preempt_disable, preempt_enable, and synchronize_sched.

Signed-off-by: Josh Triplett <josh@freedesktop.org>
Acked-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:
Josh Triplett 2006-10-04 02:17:16 -07:00 committed by Linus Torvalds
parent 11a147013e
commit 4b6c2cca6e
2 changed files with 42 additions and 3 deletions
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5
Documentation/RCU/torture.txt
View file

@ -56,8 +56,9 @@ test_no_idle_hz Whether or not to test the ability of RCU to operate in
torture_type The type of RCU to test: "rcu" for the rcu_read_lock() API, torture_type The type of RCU to test: "rcu" for the rcu_read_lock() API,
"rcu_sync" for rcu_read_lock() with synchronous reclamation, "rcu_sync" for rcu_read_lock() with synchronous reclamation,
"rcu_bh" for the rcu_read_lock_bh() API, "rcu_bh_sync" for "rcu_bh" for the rcu_read_lock_bh() API, "rcu_bh_sync" for
rcu_read_lock_bh() with synchronous reclamation, and "srcu" rcu_read_lock_bh() with synchronous reclamation, "srcu" for
for the "srcu_read_lock()" API. the "srcu_read_lock()" API, and "sched" for the use of
preempt_disable() together with synchronize_sched().
verbose Enable debug printk()s. Default is disabled. verbose Enable debug printk()s. Default is disabled.

40
kernel/rcutorture.c
View file

@ -464,9 +464,47 @@ static struct rcu_torture_ops srcu_ops = {
.name = "srcu" .name = "srcu"
}; };
/*
* Definitions for sched torture testing.
*/
static int sched_torture_read_lock(void)
{
preempt_disable();
return 0;
}
static void sched_torture_read_unlock(int idx)
{
preempt_enable();
}
static int sched_torture_completed(void)
{
return 0;
}
static void sched_torture_synchronize(void)
{
synchronize_sched();
}
static struct rcu_torture_ops sched_ops = {
.init = rcu_sync_torture_init,
.cleanup = NULL,
.readlock = sched_torture_read_lock,
.readdelay = rcu_read_delay, /* just reuse rcu's version. */
.readunlock = sched_torture_read_unlock,
.completed = sched_torture_completed,
.deferredfree = rcu_sync_torture_deferred_free,
.sync = sched_torture_synchronize,
.stats = NULL,
.name = "sched"
};
static struct rcu_torture_ops *torture_ops[] = static struct rcu_torture_ops *torture_ops[] =
{ &rcu_ops, &rcu_sync_ops, &rcu_bh_ops, &rcu_bh_sync_ops, &srcu_ops, { &rcu_ops, &rcu_sync_ops, &rcu_bh_ops, &rcu_bh_sync_ops, &srcu_ops,
NULL }; &sched_ops, NULL };
/* /*
* RCU torture writer kthread. Repeatedly substitutes a new structure * RCU torture writer kthread. Repeatedly substitutes a new structure