1. 20 Dec, 2012 2 commits
    • Juan Quintela's avatar
      savevm: New save live migration method: pending · e4ed1541
      Juan Quintela authored
      
      
      Code just now does (simplified for clarity)
      
          if (qemu_savevm_state_iterate(s->file) == 1) {
             vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
             qemu_savevm_state_complete(s->file);
          }
      
      Problem here is that qemu_savevm_state_iterate() returns 1 when it
      knows that remaining memory to sent takes less than max downtime.
      
      But this means that we could end spending 2x max_downtime, one
      downtime in qemu_savevm_iterate, and the other in
      qemu_savevm_state_complete.
      
      Changed code to:
      
          pending_size = qemu_savevm_state_pending(s->file, max_size);
          DPRINTF("pending size %lu max %lu\n", pending_size, max_size);
          if (pending_size >= max_size) {
              ret = qemu_savevm_state_iterate(s->file);
           } else {
              vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
              qemu_savevm_state_complete(s->file);
           }
      
      So what we do is: at current network speed, we calculate the maximum
      number of bytes we can sent: max_size.
      
      Then we ask every save_live section how much they have pending.  If
      they are less than max_size, we move to complete phase, otherwise we
      do an iterate one.
      
      This makes things much simpler, because now individual sections don't
      have to caluclate the bandwidth (it was implossible to do right from
      there).
      Signed-off-by: default avatarJuan Quintela <quintela@redhat.com>
      Reviewed-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      e4ed1541
    • Juan Quintela's avatar
      migration: make writes blocking · dd217b87
      Juan Quintela authored
      
      
      Move all the writes to the migration_thread, and make writings
      blocking.  Notice that are still using the iothread for everything
      that we do.
      Signed-off-by: default avatarJuan Quintela <quintela@redhat.com>
      dd217b87
  2. 19 Dec, 2012 7 commits
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  4. 30 Oct, 2012 1 commit
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  12. 15 Jun, 2012 1 commit