From c0e5ddab6e985c83714b31a88098e76c39ff084a Mon Sep 17 00:00:00 2001 From: Michael Holzheu Date: Thu, 13 Aug 2015 10:35:11 +0200 Subject: [PATCH] s390/numa: re-add DIE sched_domain_topology_level 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: e8054b654bf5 ("s390/numa: add topology tree infrastructure") Reported-and-tested-by: Evgeny Cherkashin Signed-off-by: Michael Holzheu Acked-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/topology.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c index 1fbe1f83f89c..bf05e7fc3e70 100644 --- a/arch/s390/kernel/topology.c +++ b/arch/s390/kernel/topology.c @@ -451,6 +451,7 @@ static struct sched_domain_topology_level s390_topology[] = { { cpu_thread_mask, cpu_smt_flags, SD_INIT_NAME(SMT) }, { cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) }, { cpu_book_mask, SD_INIT_NAME(BOOK) }, + { cpu_cpu_mask, SD_INIT_NAME(DIE) }, { NULL, }, }; -- 2.20.1