path: root/qmp-commands.hx
diff options
authorPeter Lieven <pl@kamp.de>2013-03-26 10:58:37 +0100
committerJuan Quintela <quintela@redhat.com>2013-03-26 13:32:33 +0100
commitf1c72795af573b24a7da5eb52375c9aba8a37972 (patch)
tree9475bdb59345550bb248fad75fa25e598811fe51 /qmp-commands.hx
parent78d07ae7ac74bcc7f79aeefbaff17fb142f44b4d (diff)
migration: do not sent zero pages in bulk stage
during bulk stage of ram migration if a page is a zero page do not send it at all. the memory at the destination reads as zero anyway. even if there is an madvise with QEMU_MADV_DONTNEED at the target upon receipt of a zero page I have observed that the target starts swapping if the memory is overcommitted. it seems that the pages are dropped asynchronously. this patch also updates QMP to return the number of skipped pages in MigrationStats. Signed-off-by: Peter Lieven <pl@kamp.de> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
Diffstat (limited to 'qmp-commands.hx')
1 files changed, 1 insertions, 0 deletions
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 5e847b18d9..fdc40486f6 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -2445,6 +2445,7 @@ The main json-object contains the following:
- "duplicate": number of pages filled entirely with the same
byte (json-int)
These are sent over the wire much more efficiently.
+ - "skipped": number of skipped zero pages (json-int)
- "normal" : number of whole pages transfered. I.e. they
were not sent as duplicate or xbzrle pages (json-int)
- "normal-bytes" : number of bytes transferred in whole