statedump: add more memory accounting related stats

* iobuf: add variable to keep count of total number of allocations
* iobuf: include 'purged' and 'filled' arenas also in dump
* mempool: more details added (with a name to tell why mem-pool
  is created)
* memory-accounting: print number of allocs in each type

this would give us much better understanding of the memory
allocation pattern

Change-Id: I117ac0c1da943a4cc91543a01963ba7940db2b5f
BUG: 3567
Reviewed-on: http://review.gluster.com/376
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vijay@gluster.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/libglusterfs/src/glusterfs.h b/libglusterfs/src/glusterfs.h
index 99fd9a97241..25f32bd5b88 100644
--- a/libglusterfs/src/glusterfs.h
+++ b/libglusterfs/src/glusterfs.h
@@ -348,6 +348,10 @@ struct _glusterfs_ctx {
         pid_t               mtab_pid; /* pid of the process which updates the mtab */
         int                 process_mode; /*mode in which process is runninng*/
 	struct syncenv      *env;         /* The env pointer to the synctasks */
+
+        struct list_head    mempool_list; /* used to keep a global list of
+                                             mempools, used to log details of
+                                             mempool in statedump */
 };
 typedef struct _glusterfs_ctx glusterfs_ctx_t;