From: "Dr. David Alan Gilbert" <dgilb...@redhat.com> This is a fix for a bug* triggered by a migration after hot unplugging a few virtio-net NICs, that caused migration never to converge, because 'migration_dirty_pages' is incorrectly initialised.
'migration_dirty_pages' is used as a tally of the number of outstanding dirty pages, to give the migration code an idea of how much more data will need to be transferred, and thus whether it can end the iterative phase. It was initialised to the total size of the RAMBlock address space, however hotunplug can leave this space sparse, and hence migration_dirty_pages ended up too large. Signed-off-by: Dr. David Alan Gilbert <dgilb...@redhat.com> (* https://bugzilla.redhat.com/show_bug.cgi?id=1074913 ) --- arch_init.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) v4: Simplify block_pages calculation (as per Paolo's comment the size has already been rounded up) v3: Commit message only; fix up stupid copy-and-paste v2: Don't worry about RAMBlocks sharing a page; it doesn't happen diff --git a/arch_init.c b/arch_init.c index f18f42e..39f5e96 100644 --- a/arch_init.c +++ b/arch_init.c @@ -727,11 +727,8 @@ static void reset_ram_globals(void) static int ram_save_setup(QEMUFile *f, void *opaque) { RAMBlock *block; - int64_t ram_pages = last_ram_offset() >> TARGET_PAGE_BITS; + int64_t ram_bitmap_pages; /* Size of bitmap in pages, including gaps */ - migration_bitmap = bitmap_new(ram_pages); - bitmap_set(migration_bitmap, 0, ram_pages); - migration_dirty_pages = ram_pages; mig_throttle_on = false; dirty_rate_high_cnt = 0; @@ -770,6 +767,22 @@ static int ram_save_setup(QEMUFile *f, void *opaque) bytes_transferred = 0; reset_ram_globals(); + ram_bitmap_pages = last_ram_offset() >> TARGET_PAGE_BITS; + migration_bitmap = bitmap_new(ram_bitmap_pages); + bitmap_set(migration_bitmap, 0, ram_bitmap_pages); + + /* + * Count the total number of pages used by ram blocks not including any + * gaps due to alignment or unplugs. + */ + migration_dirty_pages = 0; + QTAILQ_FOREACH(block, &ram_list.blocks, next) { + uint64_t block_pages = 0; + + block_pages = block->length >> TARGET_PAGE_BITS; + migration_dirty_pages += block_pages; + } + memory_global_dirty_log_start(); migration_bitmap_sync(); qemu_mutex_unlock_iothread(); -- 1.8.5.3
