[09/11] Add migration accounting for normal and duplicate pages

diff --git a/arch_init.c b/arch_init.c
index d709ccb..7f12317 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -199,6 +199,40 @@  int64_t xbzrle_cache_resize(int64_t new_size)
     return pow2floor(new_size);
 }
 
+/* accounting for migration statistics */
+typedef struct AccountingInfo {
+    uint64_t dup_pages;
+    uint64_t norm_pages;
+    uint64_t iterations;
+} AccountingInfo;
+
+static AccountingInfo acct_info;
+
+static void acct_clear(void)
+{
+    memset(&acct_info, 0, sizeof(acct_info));
+}
+
+uint64_t dup_mig_bytes_transferred(void)
+{
+    return acct_info.dup_pages * TARGET_PAGE_SIZE;
+}
+
+uint64_t dup_mig_pages_transferred(void)
+{
+    return acct_info.dup_pages;
+}
+
+uint64_t norm_mig_bytes_transferred(void)
+{
+    return acct_info.norm_pages * TARGET_PAGE_SIZE;
+}
+
+uint64_t norm_mig_pages_transferred(void)
+{
+    return acct_info.norm_pages;
+}
+
 static void save_block_hdr(QEMUFile *f, RAMBlock *block, ram_addr_t offset,
         int cont, int flag)
 {
@@ -293,6 +327,7 @@  static int ram_save_block(QEMUFile *f)
             p = memory_region_get_ram_ptr(mr) + offset;
 
             if (is_dup_page(p)) {
+                acct_info.dup_pages++;
                 save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_COMPRESS);
                 qemu_put_byte(f, *p);
                 bytes_sent = 1;
@@ -308,6 +343,7 @@  static int ram_save_block(QEMUFile *f)
                 save_block_hdr(f, block, offset, cont, RAM_SAVE_FLAG_PAGE);
                 qemu_put_buffer(f, p, TARGET_PAGE_SIZE);
                 bytes_sent = TARGET_PAGE_SIZE;
+                acct_info.norm_pages++;
             }
 
             /* if page is unmodified, continue to the next */
@@ -429,6 +465,7 @@  static int ram_save_setup(QEMUFile *f, void *opaque)
         }
         XBZRLE.encoded_buf = g_malloc0(TARGET_PAGE_SIZE);
         XBZRLE.current_buf = g_malloc(TARGET_PAGE_SIZE);
+        acct_clear();
     }
 
     /* Make sure all dirty bits are set */
@@ -477,6 +514,7 @@  static int ram_save_iterate(QEMUFile *f, void *opaque)
             break;
         }
         bytes_transferred += bytes_sent;
+        acct_info.iterations++;
         /* we want to check in the 1st loop, just in case it was the 1st time
            and we had to sync the dirty bitmap.
            qemu_get_clock_ns() is a bit expensive, so we only check each some
diff --git a/hmp.c b/hmp.c
index 175fc74..31c7f3f 100644
--- a/hmp.c
+++ b/hmp.c
@@ -160,6 +160,12 @@  void hmp_info_migrate(Monitor *mon)
                        info->ram->total >> 10);
         monitor_printf(mon, "total time: %" PRIu64 " milliseconds\n",
                        info->ram->total_time);
+        monitor_printf(mon, "duplicate: %" PRIu64 " pages\n",
+                       info->ram->duplicate);
+        monitor_printf(mon, "normal: %" PRIu64 " pagess\n",
+                       info->ram->normal);
+        monitor_printf(mon, "normal bytes: %" PRIu64 " kbytes\n",
+                       info->ram->normal_bytes >> 10);
     }
 
     if (info->has_disk) {
diff --git a/migration.c b/migration.c
index f1dbf81..9e6b791 100644
--- a/migration.c
+++ b/migration.c
@@ -161,6 +161,9 @@  MigrationInfo *qmp_query_migrate(Error **errp)
         info->ram->total = ram_bytes_total();
         info->ram->total_time = qemu_get_clock_ms(rt_clock)
             - s->total_time;
+        info->ram->duplicate = dup_mig_pages_transferred();
+        info->ram->normal = norm_mig_pages_transferred();
+        info->ram->normal_bytes = norm_mig_bytes_transferred();
 
         if (blk_mig_active()) {
             info->has_disk = true;
@@ -180,6 +183,9 @@  MigrationInfo *qmp_query_migrate(Error **errp)
         info->ram->remaining = 0;
         info->ram->total = ram_bytes_total();
         info->ram->total_time = s->total_time;
+        info->ram->duplicate = dup_mig_pages_transferred();
+        info->ram->normal = norm_mig_pages_transferred();
+        info->ram->normal_bytes = norm_mig_bytes_transferred();
         break;
     case MIG_STATE_ERROR:
         info->has_status = true;
diff --git a/migration.h b/migration.h
index 337e225..e4a7cd7 100644
--- a/migration.h
+++ b/migration.h
@@ -87,6 +87,11 @@  uint64_t ram_bytes_total(void);
 
 extern SaveVMHandlers savevm_ram_handlers;
 
+uint64_t dup_mig_bytes_transferred(void);
+uint64_t dup_mig_pages_transferred(void);
+uint64_t norm_mig_bytes_transferred(void);
+uint64_t norm_mig_pages_transferred(void);
+
 /**
  * @migrate_add_blocker - prevent migration from proceeding
  *
diff --git a/qapi-schema.json b/qapi-schema.json
index 02f34b7..edc782a 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -264,11 +264,18 @@ 
 #        migration has ended, it returns the total migration
 #        time. (since 1.2)
 #
-# Since: 0.14.0.
+# @duplicate: number of duplicate pages (since 1.2)
+#
+# @normal : number of normal pages (since 1.2)
+#
+# @normal-bytes : number of normal bytes sent (since 1.2)
+#
+# Since: 0.14.0
 ##
 { 'type': 'MigrationStats',
   'data': {'transferred': 'int', 'remaining': 'int', 'total': 'int' ,
-           'total_time': 'int' } }
+           'total_time': 'int', 'duplicate': 'int', 'normal': 'int',
+           'normal-bytes': 'int' } }
 
 ##
 # @MigrationInfo
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 274680d..d7ec281 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -2120,6 +2120,9 @@  The main json-object contains the following:
          - "transferred": amount transferred (json-int)
          - "remaining": amount remaining (json-int)
          - "total": total (json-int)
+	 - "duplicate": number of duplicated pages (json-int)
+	 - "normal" : number of normal pages transferred (json-int)
+	 - "normal-bytes" : number of normal bytes transferred (json-int)
 - "disk": only present if "status" is "active" and it is a block migration,
   it is a json-object with the following disk information (in bytes):
          - "transferred": amount transferred (json-int)
@@ -2136,7 +2139,18 @@  Examples:
 2. Migration is done and has succeeded
 
 -> { "execute": "query-migrate" }
-<- { "return": { "status": "completed" } }
+<- { "return": {
+        "status": "completed",
+        "ram":{
+          "transferred":123,
+          "remaining":123,
+          "total":246,
+          "duplicate":123,
+          "normal":123,
+          "normal-bytes":123456
+        }
+     }
+   }
 
 3. Migration is done and has failed
 
@@ -2152,7 +2166,10 @@  Examples:
          "ram":{
             "transferred":123,
             "remaining":123,
-            "total":246
+            "total":246,
+            "duplicate":123,
+            "normal":123,
+            "normal-bytes":123456
          }
       }
    }
@@ -2166,7 +2183,10 @@  Examples:
          "ram":{
             "total":1057024,
             "remaining":1053304,
-            "transferred":3720
+            "transferred":3720,
+            "duplicate":123,
+            "normal":123,
+            "normal-bytes":123456
          },
          "disk":{
             "total":20971520,