Oracle DB: which session is generating the most redo logs right now?

select * from v$sesstat
where STATISTIC# in (select STATISTIC# from v$statname where name like '%redo%')
and value>0
order by value
/


NAME
----------------------------------------------------------------
spare statistic 2

SQL> select name from v$statname where STATISTIC#=194;

NAME
----------------------------------------------------------------
redo size

SQL> select name from v$statname where STATISTIC#=197;

NAME
----------------------------------------------------------------
redo size for direct writes