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locktorture: Track time of last ->writeunlock() 

This commit adds a last_lock_release variable that tracks the time of
the last ->writeunlock() call, which allows easier diagnosing of lock
hangs when using a kernel debugger.

Acked-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-08-30 21:48:23 -07:00
parent 08c7974293
commit 3480d6774f
1 changed files with 2 additions and 0 deletions
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2
kernel/locking/locktorture.c
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@ -60,6 +60,7 @@ static struct task_struct **reader_tasks;
static bool lock_is_write_held;
static bool lock_is_read_held;
static unsigned long last_lock_release;
struct lock_stress_stats {
long n_lock_fail;
@ -632,6 +633,7 @@ static int lock_torture_writer(void *arg)
lwsp->n_lock_acquired++;
cxt.cur_ops->write_delay(&rand);
lock_is_write_held = false;
WRITE_ONCE(last_lock_release, jiffies);
cxt.cur_ops->writeunlock();
stutter_wait("lock_torture_writer");