Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 4b6c2cca authored by Josh Triplett's avatar Josh Triplett Committed by Linus Torvalds
Browse files

[PATCH] rcu: add sched torture type to rcutorture 



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

Signed-off-by: default avatarJosh Triplett <josh@freedesktop.org>
Acked-by: default avatarPaul E. McKenney <paulmck@us.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 11a14701

Documentation/RCU/torture.txt

+3 −2
Original line number Diff line number Diff line
@@ -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,

		"rcu_sync" for rcu_read_lock() with synchronous reclamation,

		"rcu_bh" for the rcu_read_lock_bh() API, "rcu_bh_sync" for

		rcu_read_lock_bh() with synchronous reclamation, and "srcu"

		for the "srcu_read_lock()" API.

		rcu_read_lock_bh() with synchronous reclamation, "srcu" for

		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.

kernel/rcutorture.c

+39 −1
Original line number Diff line number Diff line
@@ -464,9 +464,47 @@ static struct rcu_torture_ops srcu_ops = { 
	.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[] =

	{ &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