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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: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Heiko Carstens 2008-03-12 18:31:59 +01:00 committed by Ingo Molnar
parent 9aefd0abd8
commit 22e52b072d
2 changed files with 7 additions and 0 deletions
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2
include/linux/topology.h
View File

@ -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

5
kernel/sched.c
View File

@ -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)