rpc: Document env_dpdk_get_mem_stats

Signed-off-by: Monica Kenguva <monica.kenguva@intel.com>
Change-Id: If66d05c14e5758f1b27000d33b4098d73c7a51b3
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/6851
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>

doc/jsonrpc.md

@@ -1231,6 +1231,43 @@ Example response:
   }
 }
 ~~~
+
+## env_dpdk_get_mem_stats {#rpc_env_dpdk_get_mem_stats}
+
+Write the dpdk memory stats to a file.
+
+### Parameters
+
+This method has no parameters.
+
+### Response
+
+The response is a pathname to a text file containing the memory stats.
+
+### Example
+
+Example request:
+
+~~~
+{
+  "jsonrpc": "2.0",
+  "method": "env_dpdk_get_mem_stats",
+  "id": 1
+}
+~~~
+
+Example response:
+
+~~~
+{
+  "jsonrpc": "2.0",
+  "id": 1,
+  "result": {
+    "filename": "/tmp/spdk_mem_dump.txt"
+  }
+}
+~~~
+
 # Block Device Abstraction Layer {#jsonrpc_components_bdev}
 
 ## bdev_set_options {#rpc_bdev_set_options}