Recent changes (master)

Jens Axboe
2016-10-24T12:00:09Z

The following changes since commit e291cff14e97feb3cff711f5a5cbcb63b32f9c72:

Use fmt -w WIDTH option instead of -WIDTH (2016-10-20 08:10:10 -0600)

are available in the git repository at:

git://git.kernel.dk/fio.git master

for you to fetch changes up to ca0122d822ea7dd573f05ca4cf43c5d0ff9f4adb:

backend: if we can't grab stat_mutex, report a deadlock error and exit (2016-10-23 08:35:14 -0600)

----------------------------------------------------------------
Theodore Ts'o (1):
backend: if we can't grab stat_mutex, report a deadlock error and exit

backend.c | 7 +++++++
1 file changed, 7 insertions(+)

---

Diff of recent changes:

diff --git a/backend.c b/backend.c
index fb2a855..093b6a3 100644
--- a/backend.c
+++ b/backend.c
@@ -1471,6 +1471,7 @@ static void *thread_main(void *data)
struct thread_data *td = fd->td;
struct thread_options *o = &td->o;
struct sk_out *sk_out = fd->sk_out;
+ int deadlock_loop_cnt;
int clear_state;
int ret;

@@ -1731,11 +1732,17 @@ static void *thread_main(void *data)
* the rusage_sem, which would never get upped because
* this thread is waiting for the stat mutex.
*/
+ deadlock_loop_cnt = 0;
do {
check_update_rusage(td);
if (!fio_mutex_down_trylock(stat_mutex))
break;
usleep(1000);
+ if (deadlock_loop_cnt++ > 5000) {
+ log_err("fio seems to be stuck grabbing stat_mutex, forcibly exiting\n");
+ td->error = EDEADLOCK;
+ goto err;
+ }
} while (1);

if (td_read(td) && td->io_bytes[DDIR_READ])