xlators: add JSON FOP statistics dumps every N seconds

Summary:
- Adds a thread to the io-stats translator which dumps out statistics
  every N seconds where N is configurable by an option called
  "diagnostics.stats-dump-interval"
- Thread cleanly starts/stops when translator is unloaded
- Updates macros to use "Atomic Builtins" (e.g. intel CPU extentions) to
  use memory barries to update counters vs using locks.  This should
  reduce overhead and prevent any deadlock bugs due to lock contention.

Test Plan:
- Test on development machine
- Run prove -v tests/basic/stats-dump.t

Change-Id: If071239d8fdc185e4e8fd527363cc042447a245d
BUG: 1266476
Signed-off-by: Jeff Darcy <jdarcy@redhat.com>
Reviewed-on: http://review.gluster.org/12209
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Avra Sengupta <asengupt@redhat.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/tests/basic/afr/arbiter.t b/tests/basic/afr/arbiter.t
index 84d2ccece51..cecbc605541 100644
--- a/tests/basic/afr/arbiter.t
+++ b/tests/basic/afr/arbiter.t
@@ -9,6 +9,7 @@ TEST glusterd;
 TEST pidof glusterd
 
 # Non arbiter replica 3 volumes should not have arbiter-count option enabled.
+TEST mkdir -p $B0/${V0}{0,1,2}
 TEST $CLI volume create $V0 replica 3 $H0:$B0/${V0}{0,1,2}
 TEST $CLI volume start $V0
 TEST glusterfs --volfile-id=$V0 --volfile-server=$H0 --entry-timeout=0 $M0;
@@ -17,7 +18,14 @@ EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" force_umount $M0
 TEST $CLI volume stop $V0
 TEST $CLI volume delete $V0
 
+# Make sure we clean up *all the way* so we don't get "brick X is already part
+# of a volume" errors.
+cleanup;
+TEST glusterd;
+TEST pidof glusterd
+
 # Create and mount a replica 3 arbiter volume.
+TEST mkdir -p $B0/${V0}{0,1,2}
 TEST $CLI volume create $V0 replica 3 arbiter 1 $H0:$B0/${V0}{0,1,2}
 TEST $CLI volume set $V0 performance.write-behind off
 TEST $CLI volume set $V0 cluster.self-heal-daemon off