Commit 22e52b07 authored by Heiko Carstens's avatar Heiko Carstens Committed by Ingo Molnar
Browse files

sched: add arch_update_cpu_topology hook. 



Will be called each time the scheduling domains are rebuild.
Needed for architectures that don't have a static cpu topology.

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 9aefd0ab

include/linux/topology.h

+2 −0
Original line number Diff line number Diff line
@@ -50,6 +50,8 @@ 
	for_each_online_node(node)						\

		if (nr_cpus_node(node))



void arch_update_cpu_topology(void);



/* Conform to ACPI 2.0 SLIT distance definitions */

#define LOCAL_DISTANCE		10

#define REMOTE_DISTANCE		20

kernel/sched.c

+5 −0
Original line number Diff line number Diff line
@@ -6807,6 +6807,10 @@ static int ndoms_cur; /* number of sched domains in 'doms_cur' */ 
 */

static cpumask_t fallback_doms;



void __attribute__((weak)) arch_update_cpu_topology(void)

{

}



/*

 * Set up scheduler domains and groups. Callers must hold the hotplug lock.

 * For now this just excludes isolated cpus, but could be used to
@@ -6816,6 +6820,7 @@ static int arch_init_sched_domains(const cpumask_t *cpu_map) 
{

	int err;



	arch_update_cpu_topology();

	ndoms_cur = 1;

	doms_cur = kmalloc(sizeof(cpumask_t), GFP_KERNEL);

	if (!doms_cur)