Commit 7e627f81 authored by Tobias Huschle's avatar Tobias Huschle Committed by Vasily Gorbik
Browse files

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: default avatarHeiko Carstens <hca@linux.ibm.com>
Tested-by: default avatarMete Durlu <meted@linux.ibm.com>
Signed-off-by: default avatarTobias Huschle <huschle@linux.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent 9dd333e7

arch/s390/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -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

arch/s390/kernel/topology.c

+2 −0
Original line number Diff line number Diff line
@@ -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);