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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 /include
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 'include')
-rw-r--r--include/migration/migration.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/migration/migration.h b/include/migration/migration.h
index bb617fdacf..e2acec64c0 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -96,6 +96,8 @@ extern SaveVMHandlers savevm_ram_handlers;
uint64_t dup_mig_bytes_transferred(void);
uint64_t dup_mig_pages_transferred(void);
+uint64_t skipped_mig_bytes_transferred(void);
+uint64_t skipped_mig_pages_transferred(void);
uint64_t norm_mig_bytes_transferred(void);
uint64_t norm_mig_pages_transferred(void);
uint64_t xbzrle_mig_bytes_transferred(void);