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[S390] topology: fix topology on z10 machines

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Make sure that all cpus in a book on a z10 appear as book siblings
and not as core siblings. This fixes some performance regressions that
appeared after the book scheduling domain got introduced.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2011-11-14 11:19:08 +01:00 committed by Martin Schwidefsky
parent 6ed54387dc
commit f6bf1a8acd
1 changed files with 38 additions and 7 deletions
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45
arch/s390/kernel/topology.c
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@ -68,8 +68,10 @@ static cpumask_t cpu_group_map(struct mask_info *info, unsigned int cpu)
return mask;
}
static void add_cpus_to_mask(struct topology_cpu *tl_cpu,
struct mask_info *book, struct mask_info *core)
static struct mask_info *add_cpus_to_mask(struct topology_cpu *tl_cpu,
struct mask_info *book,
struct mask_info *core,
int z10)
{
unsigned int cpu;
@ -88,10 +90,16 @@ static void add_cpus_to_mask(struct topology_cpu *tl_cpu,
cpu_book_id[lcpu] = book->id;
#endif
cpumask_set_cpu(lcpu, &core->mask);
cpu_core_id[lcpu] = core->id;
if (z10) {
cpu_core_id[lcpu] = rcpu;
core = core->next;
} else {
cpu_core_id[lcpu] = core->id;
}
smp_cpu_polarization[lcpu] = tl_cpu->pp;
}
}
return core;
}
static void clear_masks(void)
@ -123,18 +131,41 @@ static void tl_to_cores(struct sysinfo_15_1_x *info)
{
#ifdef CONFIG_SCHED_BOOK
struct mask_info *book = &book_info;
struct cpuid cpu_id;
#else
struct mask_info *book = NULL;
#endif
struct mask_info *core = &core_info;
union topology_entry *tle, *end;
int z10 = 0;
#ifdef CONFIG_SCHED_BOOK
get_cpu_id(&cpu_id);
z10 = cpu_id.machine == 0x2097 || cpu_id.machine == 0x2098;
#endif
spin_lock_irq(&topology_lock);
clear_masks();
tle = info->tle;
end = (union topology_entry *)((unsigned long)info + info->length);
while (tle < end) {
#ifdef CONFIG_SCHED_BOOK
if (z10) {
switch (tle->nl) {
case 1:
book = book->next;
book->id = tle->container.id;
break;
case 0:
core = add_cpus_to_mask(&tle->cpu, book, core, z10);
break;
default:
clear_masks();
goto out;
}
tle = next_tle(tle);
continue;
}
#endif
switch (tle->nl) {
#ifdef CONFIG_SCHED_BOOK
case 2:
@ -147,7 +178,7 @@ static void tl_to_cores(struct sysinfo_15_1_x *info)
core->id = tle->container.id;
break;
case 0:
add_cpus_to_mask(&tle->cpu, book, core);
add_cpus_to_mask(&tle->cpu, book, core, z10);
break;
default:
clear_masks();
@ -328,8 +359,8 @@ void __init s390_init_cpu_topology(void)
for (i = 0; i < TOPOLOGY_NR_MAG; i++)
printk(" %d", info->mag[i]);
printk(" / %d\n", info->mnest);
alloc_masks(info, &core_info, 2);
alloc_masks(info, &core_info, 1);
#ifdef CONFIG_SCHED_BOOK
alloc_masks(info, &book_info, 3);
alloc_masks(info, &book_info, 2);
#endif
}