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[Qemu-devel] [PATCH 1/4] Postcopy: Avoid 0 length discards
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[Qemu-devel] [PATCH 1/4] Postcopy: Avoid 0 length discards |
Date: |
Wed, 27 Apr 2016 20:08:42 +0100 |
From: "Dr. David Alan Gilbert" <address@hidden>
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 <address@hidden>
---
migration/ram.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
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;
--
2.5.5