Patchwork [v6,03/11] rdma: export throughput w/ MigrationStats QMP

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Submitter mrhines@linux.vnet.ibm.com
Date April 24, 2013, 7 p.m.
Message ID <1366830057-16964-4-git-send-email-mrhines@linux.vnet.ibm.com>
Download mbox | patch
Permalink /patch/239300/
State New
Headers show

Comments

mrhines@linux.vnet.ibm.com - April 24, 2013, 7 p.m.
From: "Michael R. Hines" <mrhines@us.ibm.com>

This exposes throughput (in megabits/sec) through QMP.

Signed-off-by: Michael R. Hines <mrhines@us.ibm.com>
---
 hmp.c                         |    2 ++
 include/migration/migration.h |    1 +
 migration.c                   |   10 ++++++++++
 qapi-schema.json              |    5 ++++-
 4 files changed, 17 insertions(+), 1 deletion(-)

Patch

diff --git a/hmp.c b/hmp.c
index 4fb76ec..ab2c030 100644
--- a/hmp.c
+++ b/hmp.c
@@ -167,6 +167,8 @@  void hmp_info_migrate(Monitor *mon, const QDict *qdict)
     if (info->has_ram) {
         monitor_printf(mon, "transferred ram: %" PRIu64 " kbytes\n",
                        info->ram->transferred >> 10);
+        monitor_printf(mon, "throughput: %0.2f mbps\n",
+                       info->ram->mbps);
         monitor_printf(mon, "remaining ram: %" PRIu64 " kbytes\n",
                        info->ram->remaining >> 10);
         monitor_printf(mon, "total ram: %" PRIu64 " kbytes\n",
diff --git a/include/migration/migration.h b/include/migration/migration.h
index e2acec6..6aa15e0 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -47,6 +47,7 @@  struct MigrationState
     int64_t dirty_bytes_rate;
     bool enabled_capabilities[MIGRATION_CAPABILITY_MAX];
     int64_t xbzrle_cache_size;
+    double mbps;
 };
 
 void process_incoming_migration(QEMUFile *f);
diff --git a/migration.c b/migration.c
index 3eb0fad..4614c95 100644
--- a/migration.c
+++ b/migration.c
@@ -66,6 +66,7 @@  MigrationState *migrate_get_current(void)
         .state = MIG_STATE_SETUP,
         .bandwidth_limit = MAX_THROTTLE,
         .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE,
+        .mbps = -1,
     };
 
     return &current_migration;
@@ -201,6 +202,7 @@  MigrationInfo *qmp_query_migrate(Error **errp)
         info->ram->normal = norm_mig_pages_transferred();
         info->ram->normal_bytes = norm_mig_bytes_transferred();
         info->ram->dirty_pages_rate = s->dirty_pages_rate;
+        info->ram->mbps = s->mbps;
 
         if (blk_mig_active()) {
             info->has_disk = true;
@@ -230,6 +232,7 @@  MigrationInfo *qmp_query_migrate(Error **errp)
         info->ram->skipped = skipped_mig_pages_transferred();
         info->ram->normal = norm_mig_pages_transferred();
         info->ram->normal_bytes = norm_mig_bytes_transferred();
+        info->ram->mbps = s->mbps;
         break;
     case MIG_STATE_ERROR:
         info->has_status = true;
@@ -545,6 +548,13 @@  static void *migration_thread(void *opaque)
             double bandwidth = transferred_bytes / time_spent;
             max_size = bandwidth * migrate_max_downtime() / 1000000;
 
+            if (time_spent) {
+                s->mbps = (((double) transferred_bytes * 8.0) /
+                    ((double) time_spent / 1000.0)) / 1000.0 / 1000.0;
+            } else {
+                s->mbps = -1.0;
+            }
+
             DPRINTF("transferred %" PRIu64 " time_spent %" PRIu64
                     " bandwidth %g max_size %" PRId64 "\n",
                     transferred_bytes, time_spent, bandwidth, max_size);
diff --git a/qapi-schema.json b/qapi-schema.json
index 751d3c2..cc846c3 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -507,12 +507,15 @@ 
 # @dirty-pages-rate: number of pages dirtied by second by the
 #        guest (since 1.3)
 #
+# @mbps: throughput in megabits/sec. (since 1.5)
+#
 # Since: 0.14.0
 ##
 { 'type': 'MigrationStats',
   'data': {'transferred': 'int', 'remaining': 'int', 'total': 'int' ,
            'duplicate': 'int', 'skipped': 'int', 'normal': 'int',
-           'normal-bytes': 'int', 'dirty-pages-rate' : 'int' } }
+           'normal-bytes': 'int', 'dirty-pages-rate' : 'int',
+           'mbps' : 'number' } }
 
 ##
 # @XBZRLECacheStats