diff options
| author | Peter Xu <peterx@redhat.com> | 2018-05-02 18:47:32 +0800 |
|---|---|---|
| committer | Juan Quintela <quintela@redhat.com> | 2018-05-15 20:56:57 +0200 |
| commit | edd090c72825b483df4de6a525d430d7635a5d8e (patch) | |
| tree | 08940d5956ef466772c39a04ecc305ab134d005e /migration/trace-events | |
| parent | d1b8eadbc43739992eed75912f6a065b9f299221 (diff) | |
migration: synchronize dirty bitmap for resume
This patch implements the first part of core RAM resume logic for
postcopy. ram_resume_prepare() is provided for the work.
When the migration is interrupted by network failure, the dirty bitmap
on the source side will be meaningless, because even the dirty bit is
cleared, it is still possible that the sent page was lost along the way
to destination. Here instead of continue the migration with the old
dirty bitmap on source, we ask the destination side to send back its
received bitmap, then invert it to be our initial dirty bitmap.
The source side send thread will issue the MIG_CMD_RECV_BITMAP requests,
once per ramblock, to ask for the received bitmap. On destination side,
MIG_RP_MSG_RECV_BITMAP will be issued, along with the requested bitmap.
Data will be received on the return-path thread of source, and the main
migration thread will be notified when all the ramblock bitmaps are
synchronized.
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20180502104740.12123-17-peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Diffstat (limited to 'migration/trace-events')
| -rw-r--r-- | migration/trace-events | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/migration/trace-events b/migration/trace-events index be36fbccfe..53243e17ec 100644 --- a/migration/trace-events +++ b/migration/trace-events @@ -82,8 +82,12 @@ ram_load_postcopy_loop(uint64_t addr, int flags) "@%" PRIx64 " %x" ram_postcopy_send_discard_bitmap(void) "" ram_save_page(const char *rbname, uint64_t offset, void *host) "%s: offset: 0x%" PRIx64 " host: %p" ram_save_queue_pages(const char *rbname, size_t start, size_t len) "%s: start: 0x%zx len: 0x%zx" +ram_dirty_bitmap_request(char *str) "%s" ram_dirty_bitmap_reload_begin(char *str) "%s" ram_dirty_bitmap_reload_complete(char *str) "%s" +ram_dirty_bitmap_sync_start(void) "" +ram_dirty_bitmap_sync_wait(void) "" +ram_dirty_bitmap_sync_complete(void) "" # migration/migration.c await_return_path_close_on_source_close(void) "" |