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>

3 files changed, 13 insertions, 3 deletions

diff --git a/tests/bugs/cli/bug-1030580.t b/tests/bugs/cli/bug-1030580.t
index a907950e73f..ac8b1d8f6db 100644
--- a/tests/bugs/cli/bug-1030580.t
+++ b/tests/bugs/cli/bug-1030580.t
@@ -12,10 +12,15 @@ function write_to_file {
 TEST glusterd
 TEST pidof glusterd
 TEST $CLI volume create $V0 replica 2 $H0:$B0/${V0}0 $H0:$B0/${V0}1
+# Increasing the json stats dump time interval, so that it doesn't mess with the test.
+TEST $CLI volume set $V0 diagnostics.stats-dump-interval 3600
 TEST $CLI volume start $V0
 TEST $CLI volume profile $V0 start
 TEST glusterfs --volfile-id=/$V0 --volfile-server=$H0 $M0 --attribute-timeout=0 --entry-timeout=0
 
+# Clear the profile info uptill now.
+TEST $CLI volume profile $V0 info clear
+
 # Verify 'volume profile info' prints both cumulative and incremental stats
 write_to_file &
 wait
diff --git a/tests/bugs/cli/bug-1047416.t b/tests/bugs/cli/bug-1047416.t
index 6e1b0a48467..864301034c9 100644
--- a/tests/bugs/cli/bug-1047416.t
+++ b/tests/bugs/cli/bug-1047416.t
@@ -12,10 +12,15 @@ function write_to_file {
 TEST glusterd
 TEST pidof glusterd
 TEST $CLI volume create $V0 replica 2 $H0:$B0/${V0}0 $H0:$B0/${V0}1
+# Increasing the json stats dump time interval, so that it doesn't mess with the test.
+TEST $CLI volume set $V0 diagnostics.stats-dump-interval 3600
 TEST $CLI volume start $V0
 TEST $CLI volume profile $V0 start
 TEST glusterfs --volfile-id=/$V0 --volfile-server=$H0 $M0 --attribute-timeout=0 --entry-timeout=0
 
+# Clear the profile info uptill now.
+TEST $CLI volume profile $V0 info clear
+
 # Verify 'volume profile info' prints both cumulative and incremental stats
 write_to_file &
 wait
diff --git a/tests/bugs/snapshot/bug-1155042-dont-display-deactivated-snapshots.t b/tests/bugs/snapshot/bug-1155042-dont-display-deactivated-snapshots.t
index 6697c263ac1..c5a285eb775 100644
--- a/tests/bugs/snapshot/bug-1155042-dont-display-deactivated-snapshots.t
+++ b/tests/bugs/snapshot/bug-1155042-dont-display-deactivated-snapshots.t
@@ -21,16 +21,16 @@ TEST $GFS --volfile-server=$H0 --volfile-id=$V0 $M0
 # in the USS world
 gluster snapshot config activate-on-create enable
 for i in {1..10}; do $CLI snapshot create snap$i $V0 no-timestamp; done
-EXPECT 10 uss_count_snap_displayed $M0
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT 10 uss_count_snap_displayed $M0
 
 # snapshots should not be displayed after deactivation
 for i in {1..10}; do $CLI snapshot deactivate snap$i --mode=script; done
-EXPECT 0 uss_count_snap_displayed $M0
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT 0 uss_count_snap_displayed $M0
 
 # activate all the snapshots and check if all the activated snapshots
 # are displayed again
 for i in {1..10}; do $CLI snapshot activate snap$i --mode=script; done
-EXPECT 10 uss_count_snap_displayed $M0
+EXPECT_WITHIN $PROCESS_UP_TIMEOUT 10 uss_count_snap_displayed $M0
 
 cleanup;