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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2010-10-29 16:50:37 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2010-10-29 16:50:49 +0200 |
| commit | 8d11e0218321fccc6912c4dcfbaf2095bad5d33a (patch) | |
| tree | 6c26fd32b731c22027ed325d353fdd49ef34eaff /arch | |
| parent | db81a23d8003d1ca4452c6d728502780f0234368 (diff) | |
| download | op-kernel-dev-8d11e0218321fccc6912c4dcfbaf2095bad5d33a.zip op-kernel-dev-8d11e0218321fccc6912c4dcfbaf2095bad5d33a.tar.gz | |
[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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/s390/Kconfig | 11 | ||||
| -rw-r--r-- | arch/s390/kernel/sysinfo.c | 2 |
2 files changed, 12 insertions, 1 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 97146ab..45a9bed 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -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. diff --git a/arch/s390/kernel/sysinfo.c b/arch/s390/kernel/sysinfo.c index f04d93a..5c9e439 100644 --- a/arch/s390/kernel/sysinfo.c +++ b/arch/s390/kernel/sysinfo.c @@ -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; } |
