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Subject[RFC][PATCH 03/14] sched: Simplify build_sched_groups
Notice that the mask being computed is the same as the domain span we
just computed. By using the domain_span we can avoid some mask
allocations and computations.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
---
kernel/sched.c | 52 ++++++++++++++++------------------------------------
1 file changed, 16 insertions(+), 36 deletions(-)
Index: linux-2.6/kernel/sched.c
===================================================================
--- linux-2.6.orig/kernel/sched.c
+++ linux-2.6/kernel/sched.c
@@ -6842,9 +6842,6 @@ struct s_data {
cpumask_var_t notcovered;
#endif
cpumask_var_t nodemask;
- cpumask_var_t this_sibling_map;
- cpumask_var_t this_core_map;
- cpumask_var_t this_book_map;
cpumask_var_t send_covered;
cpumask_var_t tmpmask;
struct sched_group **sched_group_nodes;
@@ -6856,9 +6853,6 @@ enum s_alloc {
sa_rootdomain,
sa_tmpmask,
sa_send_covered,
- sa_this_book_map,
- sa_this_core_map,
- sa_this_sibling_map,
sa_nodemask,
sa_sched_group_nodes,
#ifdef CONFIG_NUMA
@@ -7201,12 +7195,6 @@ static void __free_domain_allocs(struct
free_cpumask_var(d->tmpmask); /* fall through */
case sa_send_covered:
free_cpumask_var(d->send_covered); /* fall through */
- case sa_this_book_map:
- free_cpumask_var(d->this_book_map); /* fall through */
- case sa_this_core_map:
- free_cpumask_var(d->this_core_map); /* fall through */
- case sa_this_sibling_map:
- free_cpumask_var(d->this_sibling_map); /* fall through */
case sa_nodemask:
free_cpumask_var(d->nodemask); /* fall through */
case sa_sched_group_nodes:
@@ -7245,14 +7233,8 @@ static enum s_alloc __visit_domain_alloc
#endif
if (!alloc_cpumask_var(&d->nodemask, GFP_KERNEL))
return sa_sched_group_nodes;
- if (!alloc_cpumask_var(&d->this_sibling_map, GFP_KERNEL))
- return sa_nodemask;
- if (!alloc_cpumask_var(&d->this_core_map, GFP_KERNEL))
- return sa_this_sibling_map;
- if (!alloc_cpumask_var(&d->this_book_map, GFP_KERNEL))
- return sa_this_core_map;
if (!alloc_cpumask_var(&d->send_covered, GFP_KERNEL))
- return sa_this_book_map;
+ return sa_nodemask;
if (!alloc_cpumask_var(&d->tmpmask, GFP_KERNEL))
return sa_send_covered;
d->rd = alloc_rootdomain();
@@ -7364,39 +7346,40 @@ static struct sched_domain *__build_smt_
static void build_sched_groups(struct s_data *d, enum sched_domain_level l,
const struct cpumask *cpu_map, int cpu)
{
+ struct sched_domain *sd;
+
switch (l) {
#ifdef CONFIG_SCHED_SMT
case SD_LV_SIBLING: /* set up CPU (sibling) groups */
- cpumask_and(d->this_sibling_map, cpu_map,
- topology_thread_cpumask(cpu));
- if (cpu == cpumask_first(d->this_sibling_map))
- init_sched_build_groups(d->this_sibling_map, cpu_map,
+ sd = &per_cpu(cpu_domains, cpu).sd;
+ if (cpu == cpumask_first(sched_domain_span(sd)))
+ init_sched_build_groups(sched_domain_span(sd), cpu_map,
&cpu_to_cpu_group,
d->send_covered, d->tmpmask);
break;
#endif
#ifdef CONFIG_SCHED_MC
case SD_LV_MC: /* set up multi-core groups */
- cpumask_and(d->this_core_map, cpu_map, cpu_coregroup_mask(cpu));
- if (cpu == cpumask_first(d->this_core_map))
- init_sched_build_groups(d->this_core_map, cpu_map,
+ sd = &per_cpu(core_domains, cpu).sd;
+ if (cpu == cpumask_first(sched_domain_span(sd)))
+ init_sched_build_groups(sched_domain_span(sd), cpu_map,
&cpu_to_core_group,
d->send_covered, d->tmpmask);
break;
#endif
#ifdef CONFIG_SCHED_BOOK
case SD_LV_BOOK: /* set up book groups */
- cpumask_and(d->this_book_map, cpu_map, cpu_book_mask(cpu));
- if (cpu == cpumask_first(d->this_book_map))
- init_sched_build_groups(d->this_book_map, cpu_map,
+ sd = &per_cpu(book_domains, cpu).sd;
+ if (cpu == cpumask_first(sched_domain_span(sd)))
+ init_sched_build_groups(sched_domain_span(sd), cpu_map,
&cpu_to_book_group,
d->send_covered, d->tmpmask);
break;
#endif
case SD_LV_CPU: /* set up physical groups */
- cpumask_and(d->nodemask, cpumask_of_node(cpu), cpu_map);
- if (!cpumask_empty(d->nodemask))
- init_sched_build_groups(d->nodemask, cpu_map,
+ sd = &per_cpu(phys_domains, cpu).sd;
+ if (cpu == cpumask_first(sched_domain_span(sd)))
+ init_sched_build_groups(sched_domain_span(sd), cpu_map,
&cpu_to_phys_group,
d->send_covered, d->tmpmask);
break;
@@ -7452,11 +7435,8 @@ static int __build_sched_domains(const s
build_sched_groups(&d, SD_LV_SIBLING, cpu_map, i);
build_sched_groups(&d, SD_LV_BOOK, cpu_map, i);
build_sched_groups(&d, SD_LV_MC, cpu_map, i);
- }
-
- /* Set up physical groups */
- for (i = 0; i < nr_node_ids; i++)
build_sched_groups(&d, SD_LV_CPU, cpu_map, i);
+ }

#ifdef CONFIG_NUMA
/* Set up node groups */



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