The following changes since commit dac499a01d1958781e526df982d78d733f19c527:
Cpu clock does not wrap if there is no CPU clock (2015-03-20 10:29:29 -0600)
are available in the git repository at:
git://git.kernel.dk/fio.git master
for you to fetch changes up to 40c666c87c2d7751abea8fc2f866404d1efbdee2:
Always update rusage before grabbing stat_mutex (2015-03-23 10:19:44 -0600)
----------------------------------------------------------------
Jens Axboe (1):
Always update rusage before grabbing stat_mutex
backend.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
---
Diff of recent changes:
diff --git a/backend.c b/backend.c
index fdb7413..2be7149 100644
--- a/backend.c
+++ b/backend.c
@@ -1526,6 +1526,15 @@ static void *thread_main(void *data)
clear_state = 1;
+ /*
+ * Make sure we've successfully updated the rusage stats
+ * before waiting on the stat mutex. Otherwise we could have
+ * the stat thread holding stat mutex and waiting for
+ * the rusage_sem, which would never get upped because
+ * this thread is waiting for the stat mutex.
+ */
+ check_update_rusage(td);
+
fio_mutex_down(stat_mutex);
if (td_read(td) && td->io_bytes[DDIR_READ]) {
elapsed = mtime_since_now(&td->start);
@@ -1556,6 +1565,11 @@ static void *thread_main(void *data)
do_verify(td, verify_bytes);
+ /*
+ * See comment further up for why this is done here.
+ */
+ check_update_rusage(td);
+
fio_mutex_down(stat_mutex);
td->ts.runtime[DDIR_READ] += mtime_since_now(&td->start);
fio_gettime(&td->start, NULL);
--
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