diff options
| author | Tobias Huschle <huschle@linux.ibm.com> | 2024-08-12 13:39:32 +0200 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2024-08-29 22:56:35 +0200 |
| commit | 7e627f819302b8c22098b0575c35a3349c4e306f (patch) | |
| tree | 9853e32026531b83e656400cd396b1818360fccc /arch/s390 | |
| parent | 9dd333e7afc4a4855f821a7be83733b8ef48d5ba (diff) | |
s390/topology: Add config option to switch to vertical during boot
By default, all systems on s390 start in horizontal cpu polarization.
Selecting the new config option SCHED_TOPOLOGY_VERTICAL allows to build
a kernel that switches to vertical polarization during boot.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Tested-by: Mete Durlu <meted@linux.ibm.com>
Signed-off-by: Tobias Huschle <huschle@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/Kconfig | 8 | ||||
| -rw-r--r-- | arch/s390/kernel/topology.c | 2 |
2 files changed, 10 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index abc7e1cc0e7c..2ee634bab222 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -513,6 +513,14 @@ config SCHED_TOPOLOGY making when dealing with machines that have multi-threading, multiple cores or multiple books. +config SCHED_TOPOLOGY_VERTICAL + def_bool y + bool "Use vertical CPU polarization by default" + depends on SCHED_TOPOLOGY + help + Use vertical CPU polarization by default if available. + The default CPU polarization is horizontal. + source "kernel/Kconfig.hz" config CERT_STORE diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c index 4bd0ee8eb1ab..58da6d1bae45 100644 --- a/arch/s390/kernel/topology.c +++ b/arch/s390/kernel/topology.c @@ -674,6 +674,8 @@ static int __init topology_init(void) set_topology_timer(); else topology_update_polarization_simple(); + if (IS_ENABLED(CONFIG_SCHED_TOPOLOGY_VERTICAL)) + set_polarization(1); register_sysctl("s390", topology_ctl_table); dev_root = bus_get_dev_root(&cpu_subsys); |