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Convert cpu_sibling_map to be a per cpu variable

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Convert cpu_sibling_map from a static array sized by NR_CPUS to a per_cpu
variable.  This saves sizeof(cpumask_t) * NR unused cpus.  Access is mostly
from startup and CPU HOTPLUG functions.

Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Travis
2007-10-16 01:24:05 -07:00
committed by Linus Torvalds
parent 0835761129
commit d5a7430ddc
26 changed files with 107 additions and 82 deletions
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8
kernel/sched.c
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@@ -5869,7 +5869,7 @@ static int cpu_to_core_group(int cpu, const cpumask_t *cpu_map,
struct sched_group **sg)
{
int group;
cpumask_t mask = cpu_sibling_map[cpu];
cpumask_t mask = per_cpu(cpu_sibling_map, cpu);
cpus_and(mask, mask, *cpu_map);
group = first_cpu(mask);
if (sg)
@@ -5898,7 +5898,7 @@ static int cpu_to_phys_group(int cpu, const cpumask_t *cpu_map,
cpus_and(mask, mask, *cpu_map);
group = first_cpu(mask);
#elif defined(CONFIG_SCHED_SMT)
cpumask_t mask = cpu_sibling_map[cpu];
cpumask_t mask = per_cpu(cpu_sibling_map, cpu);
cpus_and(mask, mask, *cpu_map);
group = first_cpu(mask);
#else
@@ -6132,7 +6132,7 @@ static int build_sched_domains(const cpumask_t *cpu_map)
p = sd;
sd = &per_cpu(cpu_domains, i);
*sd = SD_SIBLING_INIT;
sd->span = cpu_sibling_map[i];
sd->span = per_cpu(cpu_sibling_map, i);
cpus_and(sd->span, sd->span, *cpu_map);
sd->parent = p;
p->child = sd;
@@ -6143,7 +6143,7 @@ static int build_sched_domains(const cpumask_t *cpu_map)
#ifdef CONFIG_SCHED_SMT
/* Set up CPU (sibling) groups */
for_each_cpu_mask(i, *cpu_map) {
cpumask_t this_sibling_map = cpu_sibling_map[i];
cpumask_t this_sibling_map = per_cpu(cpu_sibling_map, i);
cpus_and(this_sibling_map, this_sibling_map, *cpu_map);
if (i != first_cpu(this_sibling_map))
continue;