core: add more information on dictionary usage

when you take the 'statedump', it shows the output like below

-----
[dict]
max-number-of-dict-pairs=13
total-pairs-used=41613
total-dict-used=12629
average-pairs-per-dict=3
------

Updates #220

Change-Id: I71a7eda3a3cd23edf4483234f22f983923bbb081
Signed-off-by: Amar Tumballi <amarts@redhat.com>
Reviewed-on: https://review.gluster.org/4035
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Jeff Darcy <jeff@pl.atyp.us>

1 files changed, 8 insertions, 0 deletions

diff --git a/libglusterfs/src/glusterfs.h b/libglusterfs/src/glusterfs.h
index 7eaeb0c7dbd..6feefb85e97 100644
--- a/libglusterfs/src/glusterfs.h
+++ b/libglusterfs/src/glusterfs.h
@@ -37,6 +37,7 @@
 #include "lkowner.h"
 #include "compat-uuid.h"
 #include "refcount.h"
+#include "atomic.h"
 
 #define GF_YES 1
 #define GF_NO  0
@@ -522,6 +523,13 @@ struct _glusterfs_ctx {
         struct gf_ctx_tw   *tw; /* refcounted timer_wheel */
 
         gf_lock_t           volfile_lock;
+
+
+        struct {
+                gf_atomic_t max_dict_pairs;
+                gf_atomic_t total_pairs_used;
+                gf_atomic_t total_dicts_used;
+        } stats;
 };
 typedef struct _glusterfs_ctx glusterfs_ctx_t;