/* Number of btrees processed in the current checkpoint. */
    wt_shared uint32_t obsolete_tw_btree_count;

    /* Maximum number of pages that can be processed per btree by checkpoint cleanup. */
    uint32_t checkpoint_cleanup_obsolete_tw_pages_dirty_max;

    /* Maximum number of pages that can be processed per btree by eviction. */
    uint32_t eviction_obsolete_tw_pages_dirty_max;

    /* Maximum number of btrees that can be processed per checkpoint. */
    uint32_t obsolete_tw_btree_max;