Commit 8d11e021 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

[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: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent db81a23d

arch/s390/Kconfig

+10 −1
Original line number Original line Diff line number Diff line
@@ -196,9 +196,18 @@ config HOTPLUG_CPU 
	  can be controlled through /sys/devices/system/cpu/cpu#.

	  can be controlled through /sys/devices/system/cpu/cpu#.

	  Say N if you want to disable CPU hotplug.

	  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

config SCHED_BOOK

	bool "Book scheduler support"

	bool "Book scheduler support"

	depends on SMP

	depends on SMP && SCHED_MC

	help

	help

	  Book scheduler support improves the CPU scheduler's decision making

	  Book scheduler support improves the CPU scheduler's decision making

	  when dealing with machines that have several books.

	  when dealing with machines that have several books.

arch/s390/kernel/sysinfo.c

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

	for (i = 0; i < TOPOLOGY_NR_MAG; i++)

		len += sprintf(page + len, " %d", info->mag[i]);

		len += sprintf(page + len, " %d", info->mag[i]);

	len += sprintf(page + len, "\n");

	len += sprintf(page + len, "\n");

#ifdef CONFIG_SCHED_MC

	store_topology(info);

	store_topology(info);

	len += sprintf(page + len, "CPU Topology SW:     ");

	len += sprintf(page + len, "CPU Topology SW:     ");

	for (i = 0; i < TOPOLOGY_NR_MAG; i++)

	for (i = 0; i < TOPOLOGY_NR_MAG; i++)

		len += sprintf(page + len, " %d", info->mag[i]);

		len += sprintf(page + len, " %d", info->mag[i]);

	len += sprintf(page + len, "\n");

	len += sprintf(page + len, "\n");

#endif

	return len;

	return len;

}

}