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Commit 8d11e021 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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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: 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 Diff line number Diff line
@@ -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.

arch/s390/kernel/sysinfo.c

+2 −0
Original line number 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++)

		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;

}