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[PATCH] rcu: add rcu_sync torture type to rcutorture 

Use the newly-generic synchronous deferred free function to implement torture
testing for RCU using synchronize_rcu rather than the asynchronous call_rcu.

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 02:17:15 -07:00 committed by Linus Torvalds
parent e303373658
commit 20d2e4283a
2 changed files with 19 additions and 5 deletions
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7
Documentation/RCU/torture.txt
View File

@ -53,9 +53,10 @@ test_no_idle_hz Whether or not to test the ability of RCU to operate in
a kernel that disables the scheduling-clock interrupt to a kernel that disables the scheduling-clock interrupt to
idle CPUs. Boolean parameter, "1" to test, "0" otherwise. idle CPUs. Boolean parameter, "1" to test, "0" otherwise.
torture_type The type of RCU to test: "rcu" for the rcu_read_lock() torture_type The type of RCU to test: "rcu" for the rcu_read_lock() API,
API, "rcu_bh" for the rcu_read_lock_bh() API, and "srcu" "rcu_sync" for rcu_read_lock() with synchronous reclamation,
for the "srcu_read_lock()" API. "rcu_bh" for the rcu_read_lock_bh() API, and "srcu" for the
"srcu_read_lock()" API.
verbose Enable debug printk()s. Default is disabled. verbose Enable debug printk()s. Default is disabled.

17
kernel/rcutorture.c
View File

@ -58,7 +58,7 @@ static int stat_interval; /* Interval between stats, in seconds. */
static int verbose; /* Print more debug info. */ static int verbose; /* Print more debug info. */
static int test_no_idle_hz; /* Test RCU's support for tickless idle CPUs. */ static int test_no_idle_hz; /* Test RCU's support for tickless idle CPUs. */
static int shuffle_interval = 5; /* Interval between shuffles (in sec)*/ static int shuffle_interval = 5; /* Interval between shuffles (in sec)*/
static char *torture_type = "rcu"; /* What to torture: rcu, rcu_bh, srcu. */ static char *torture_type = "rcu"; /* What RCU implementation to torture. */
module_param(nreaders, int, 0); module_param(nreaders, int, 0);
MODULE_PARM_DESC(nreaders, "Number of RCU reader threads"); MODULE_PARM_DESC(nreaders, "Number of RCU reader threads");
@ -297,6 +297,19 @@ static void rcu_sync_torture_init(void)
INIT_LIST_HEAD(&rcu_torture_removed); INIT_LIST_HEAD(&rcu_torture_removed);
} }
static struct rcu_torture_ops rcu_sync_ops = {
.init = rcu_sync_torture_init,
.cleanup = NULL,
.readlock = rcu_torture_read_lock,
.readdelay = rcu_read_delay,
.readunlock = rcu_torture_read_unlock,
.completed = rcu_torture_completed,
.deferredfree = rcu_sync_torture_deferred_free,
.sync = synchronize_rcu,
.stats = NULL,
.name = "rcu_sync"
};
/* /*
* Definitions for rcu_bh torture testing. * Definitions for rcu_bh torture testing.
*/ */
@ -439,7 +452,7 @@ static struct rcu_torture_ops srcu_ops = {
}; };
static struct rcu_torture_ops *torture_ops[] = static struct rcu_torture_ops *torture_ops[] =
{ &rcu_ops, &rcu_bh_ops, &srcu_ops, NULL }; { &rcu_ops, &rcu_sync_ops, &rcu_bh_ops, &srcu_ops, NULL };
/* /*
* RCU torture writer kthread. Repeatedly substitutes a new structure * RCU torture writer kthread. Repeatedly substitutes a new structure