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| author | Peter Lieven <pl@kamp.de> | 2013-03-26 10:58:37 +0100 |
|---|---|---|
| committer | Juan Quintela <quintela@redhat.com> | 2013-03-26 13:32:33 +0100 |
| commit | f1c72795af573b24a7da5eb52375c9aba8a37972 (patch) | |
| tree | 9475bdb59345550bb248fad75fa25e598811fe51 /qmp-commands.hx | |
| parent | 78d07ae7ac74bcc7f79aeefbaff17fb142f44b4d (diff) | |
| download | qemu-f1c72795af573b24a7da5eb52375c9aba8a37972.zip qemu-f1c72795af573b24a7da5eb52375c9aba8a37972.tar.gz qemu-f1c72795af573b24a7da5eb52375c9aba8a37972.tar.bz2 | |
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')
| -rw-r--r-- | qmp-commands.hx | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/qmp-commands.hx b/qmp-commands.hx index 5e847b1..fdc4048 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 |