[PATCH v2 2/3] Add zero-copy-copied migration stat

[Leonardo Bras]

Signed-off-by: Leonardo Bras <leob...@redhat.com>
---
 qapi/migration.json   | 5 ++++-
 migration/migration.c | 1 +
 monitor/hmp-cmds.c    | 4 ++++
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/qapi/migration.json b/qapi/migration.json
index 7102e474a6..925f009868 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -55,6 +55,9 @@
 # @postcopy-bytes: The number of bytes sent during the post-copy phase
 #                  (since 7.0).
 #
+# @zero-copy-copied: The number of zero-copy flushes that reported data sent
+#                    using zero-copy that ended up being copied. (since 7.2)
+#
 # Since: 0.14
 ##
 { 'struct': 'MigrationStats',
@@ -65,7 +68,7 @@
            'postcopy-requests' : 'int', 'page-size' : 'int',
            'multifd-bytes' : 'uint64', 'pages-per-second' : 'uint64',
            'precopy-bytes' : 'uint64', 'downtime-bytes' : 'uint64',
-           'postcopy-bytes' : 'uint64' } }
+           'postcopy-bytes' : 'uint64', 'zero-copy-copied' : 'uint64' } }
 
 ##
 # @XBZRLECacheStats:
diff --git a/migration/migration.c b/migration/migration.c
index 78f5057373..68fc3894ba 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1034,6 +1034,7 @@ static void populate_ram_info(MigrationInfo *info, 
MigrationState *s)
     info->ram->precopy_bytes = ram_counters.precopy_bytes;
     info->ram->downtime_bytes = ram_counters.downtime_bytes;
     info->ram->postcopy_bytes = ram_counters.postcopy_bytes;
+    info->ram->zero_copy_copied = ram_counters.zero_copy_copied;
 
     if (migrate_use_xbzrle()) {
         info->has_xbzrle_cache = true;
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index ca98df0495..bcb1799543 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -307,6 +307,10 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict)
             monitor_printf(mon, "postcopy ram: %" PRIu64 " kbytes\n",
                            info->ram->postcopy_bytes >> 10);
         }
+        if (info->ram->zero_copy_copied) {
+            monitor_printf(mon, "zero-copy copied: %" PRIu64 " iterations\n",
+                           info->ram->zero_copy_copied);
+        }
     }
 
     if (info->has_disk) {
-- 
2.36.1