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[S390] topology: add SCHED_MC config option 

This allows us to easily check for performance differences seen with
!CONFIG_SCHED_MC and topology=off.
Actually there shouldn't be any (besides a small overhead because of
additional code).

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2010-10-29 16:50:37 +02:00 committed by Martin Schwidefsky
parent db81a23d80
commit 8d11e02183
2 changed files with 12 additions and 1 deletions
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11
arch/s390/Kconfig
View File

@ -196,9 +196,18 @@ config HOTPLUG_CPU
can be controlled through /sys/devices/system/cpu/cpu#.
Say N if you want to disable CPU hotplug.
config SCHED_MC
def_bool y
prompt "Multi-core scheduler support"
depends on SMP
help
Multi-core scheduler support improves the CPU scheduler's decision
making when dealing with multi-core CPU chips at a cost of slightly
increased overhead in some places.
config SCHED_BOOK
bool "Book scheduler support"
depends on SMP
depends on SMP && SCHED_MC
help
Book scheduler support improves the CPU scheduler's decision making
when dealing with machines that have several books.

2
arch/s390/kernel/sysinfo.c
View File

@ -106,11 +106,13 @@ static int stsi_15_1_x(struct sysinfo_15_1_x *info, char *page, int len)
for (i = 0; i < TOPOLOGY_NR_MAG; i++)
len += sprintf(page + len, " %d", info->mag[i]);
len += sprintf(page + len, "\n");
#ifdef CONFIG_SCHED_MC
store_topology(info);
len += sprintf(page + len, "CPU Topology SW: ");
for (i = 0; i < TOPOLOGY_NR_MAG; i++)
len += sprintf(page + len, " %d", info->mag[i]);
len += sprintf(page + len, "\n");
#endif
return len;
}