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>

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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/Kconfig

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4

arch/s390/include/asm/topology.h

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33

arch/s390/kernel/topology.c

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25

arch/s390/numa/mode_emu.c

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