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s390/topology: add drawer scheduling domain level

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The z13 machine added a fourth level to the cpu topology
information. The new top level is called drawer.

A drawer contains two books, which used to be the top level.

Adding this additional scheduling domain did show performance
improvements for some workloads of up to 8%, while there don't
seem to be any workloads impacted in a negative way.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2016-05-25 10:25:50 +02:00
committed by Martin Schwidefsky
parent a62247e1f5
commit adac0f1e8c
4 changed files with 55 additions and 11 deletions
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4
arch/s390/include/asm/topology.h
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@@ -14,10 +14,12 @@ struct cpu_topology_s390 {
unsigned short core_id;
unsigned short socket_id;
unsigned short book_id;
unsigned short drawer_id;
unsigned short node_id;
cpumask_t thread_mask;
cpumask_t core_mask;
cpumask_t book_mask;
cpumask_t drawer_mask;
};
DECLARE_PER_CPU(struct cpu_topology_s390, cpu_topology);
@@ -30,6 +32,8 @@ DECLARE_PER_CPU(struct cpu_topology_s390, cpu_topology);
#define topology_core_cpumask(cpu) (&per_cpu(cpu_topology, cpu).core_mask)
#define topology_book_id(cpu) (per_cpu(cpu_topology, cpu).book_id)
#define topology_book_cpumask(cpu) (&per_cpu(cpu_topology, cpu).book_mask)
#define topology_drawer_id(cpu) (per_cpu(cpu_topology, cpu).drawer_id)
#define topology_drawer_cpumask(cpu) (&per_cpu(cpu_topology, cpu).drawer_mask)
#define mc_capable() 1