By accident this level has been removed by the NUMA infrastructure patch.
For non-NUMA systems with CPUs that span more than one book, this makes
the scheduler only use one of the books and the other books remain idle.
Fix this and re-add the missing level.
For NUMA and non-NUMA we have the following scheduling domains and groups:
- SMT (Groups: CPU threads)
- MC (Groups: Cores)
- BOOK (Groups: Books)
For the non-NUMA case we have one last level scheduling domain:
- DIE (Groups: Whole system, has all CPUs -> cpu_cpu_mask)
For the NUMA case we have the following two last level scheduling domains:
- DIE (Groups: NUMA nodes -> cpu_cpu_mask -> returns node siblings)
- NUMA (Groups: Whole system, has all CPUs -> created in sched_init_numa())
Fixes: e8054b654b ("s390/numa: add topology tree infrastructure")
Reported-and-tested-by: Evgeny Cherkashin <Eugene.Crosser@ru.ibm.com>
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
c0e5ddab6e