[PATCH 1/2] migration: Document all migration_stats

[Juan Quintela <quintela@redhat.com>]

Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/migration-stats.h | 43 +++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/migration/migration-stats.h b/migration/migration-stats.h
index 149af932d7..0e49c236fa 100644
--- a/migration/migration-stats.h
+++ b/migration/migration-stats.h
@@ -22,17 +22,60 @@
  * one thread).
  */
 typedef struct {
+    /*
+     * number of bytes that were dirty last time that we sync with the
+     * guest memory.  We use that to calculate the downtime.  As the
+     * remaining dirty amounts to what we know that is still dirty
+     * since last iteration, not counting what the guest has dirtied
+     * sync we synchronize bitmaps.
+     */
     Stat64 dirty_bytes_last_sync;
+    /*
+     * number of pages dirtied by second.
+     */
     Stat64 dirty_pages_rate;
+    /*
+     * number of times we have synchronize guest bitmaps.
+     */
     Stat64 dirty_sync_count;
+    /*
+     * number of times zero copy failed to send any page using zero
+     * copy.
+     */
     Stat64 dirty_sync_missed_zero_copy;
+    /*
+     * number of bytes sent at migration completion stage while the
+     * guest is stopped.
+     */
     Stat64 downtime_bytes;
+    /*
+     * number of pages transferred that were full of zeros.
+     */
     Stat64 zero_pages;
+    /*
+     * number of bytes sent through multifd channels.
+     */
     Stat64 multifd_bytes;
+    /*
+     * number of pages transferred that were not full of zeros.
+     */
     Stat64 normal_pages;
+    /*
+     * number of bytes sent during postcopy.
+     */
     Stat64 postcopy_bytes;
+    /*
+     * number of postcopy page faults that we have handled during
+     * postocpy stage.
+     */
     Stat64 postcopy_requests;
+    /*
+     *  number of bytes sent during precopy stage.
+     */
     Stat64 precopy_bytes;
+    /*
+     * total number of bytes transferred.
+     */
     Stat64 transferred;
 } MigrationAtomicStats;
 
-- 
2.40.0