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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 /include | |
| 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 'include')
| -rw-r--r-- | include/migration/migration.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/migration/migration.h b/include/migration/migration.h index bb617fd..e2acec6 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); |