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[v3,1/5] Postcopy: Avoid 0 length discards

Message ID 1462538059-27630-2-git-send-email-dgilbert@redhat.com
State New
Headers show

Commit Message

Dr. David Alan Gilbert May 6, 2016, 12:34 p.m. UTC 
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

The discard code in migration/ram.c would send request for
zero length discards in the case where no discards were needed.
It doesn't appear to have had any bad effect.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Denis V. Lunev <den@openvz.org>
---
 migration/ram.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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Patch

diff --git a/migration/ram.c b/migration/ram.c
index 3f05738..e96c2af 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1557,7 +1557,9 @@  static int postcopy_send_discard_bm_ram(MigrationState *ms,
             } else {
                 discard_length = zero - one;
             }
-            postcopy_discard_send_range(ms, pds, one, discard_length);
+            if (discard_length) {
+                postcopy_discard_send_range(ms, pds, one, discard_length);
+            }
             current = one + discard_length;
         } else {
             current = one;