path: root/kernel/torture.c
diff options
authorPaul E. McKenney <paulmck@linux.ibm.com>2019-04-09 14:44:49 -0700
committerPaul E. McKenney <paulmck@linux.ibm.com>2019-05-28 09:06:09 -0700
commitff3bf92d90d396e51eb78c5ecde11a994ab7a179 (patch)
tree6ba832a9d6128bf12478f8df3b5710431d2c9668 /kernel/torture.c
parente8516c64fe97e27a28fd5bc65b616508ae0020cf (diff)
torture: Allow inter-stutter interval to be specified
Currently, the inter-stutter interval is the same as the stutter duration, that is, whatever number of jiffies is passed into torture_stutter_init(). This has worked well for quite some time, but the addition of forward-progress testing to rcutorture can delay processes for several seconds, which can triple the time that they are stuttered. This commit therefore adds a second argument to torture_stutter_init() that specifies the inter-stutter interval. While locktorture preserves the current behavior, rcutorture uses the RCU CPU stall warning interval to provide a wider inter-stutter interval. Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Diffstat (limited to 'kernel/torture.c')
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/torture.c b/kernel/torture.c
index de0e0ecf88e1..a8d9bdfba7c3 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -570,6 +570,7 @@ static void torture_shutdown_cleanup(void)
static struct task_struct *stutter_task;
static int stutter_pause_test;
static int stutter;
+static int stutter_gap;
* Block until the stutter interval ends. This must be called periodically
@@ -621,7 +622,7 @@ static int torture_stutter(void *arg)
WRITE_ONCE(stutter_pause_test, 0);
if (!torture_must_stop())
- schedule_timeout_interruptible(stutter);
+ schedule_timeout_interruptible(stutter_gap);
} while (!torture_must_stop());
@@ -631,9 +632,10 @@ static int torture_stutter(void *arg)
* Initialize and kick off the torture_stutter kthread.
-int torture_stutter_init(const int s)
+int torture_stutter_init(const int s, const int sgap)
stutter = s;
+ stutter_gap = sgap;
return torture_create_kthread(torture_stutter, NULL, stutter_task);

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