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| author | Paul E. McKenney <paulmck@kernel.org> | 2020-08-30 21:48:23 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2020-11-06 17:13:29 -0800 |
| commit | 3480d6774f07341e3e1cf3114f58bef98ea58ae0 (patch) | |
| tree | 8fda088de1112129a861d85de5697cb5b0965898 /kernel/locking | |
| parent | 08c7974293851da6a64989b5ce7a0750e58178b1 (diff) | |
| download | linux-3480d6774f07341e3e1cf3114f58bef98ea58ae0.tar.gz linux-3480d6774f07341e3e1cf3114f58bef98ea58ae0.tar.bz2 linux-3480d6774f07341e3e1cf3114f58bef98ea58ae0.zip | |
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>
Diffstat (limited to 'kernel/locking')
| -rw-r--r-- | kernel/locking/locktorture.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c index 62d215b2e39f..316531de2a81 100644 --- a/kernel/locking/locktorture.c +++ b/kernel/locking/locktorture.c @@ -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"); |