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sched: Add book scheduling domain 

On top of the SMT and MC scheduling domains this adds the BOOK scheduling
domain. This is useful for NUMA like machines which do not have an interface
which tells which piece of memory is attached to which node or where the
hardware performs striping.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20100831082844.253053798@de.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Heiko Carstens 2010-08-31 10:28:16 +02:00 committed by Ingo Molnar
parent f269893c57
commit 01a08546af
3 changed files with 82 additions and 2 deletions
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1
include/linux/sched.h
View File

@ -875,6 +875,7 @@ enum sched_domain_level {
SD_LV_NONE = 0,
SD_LV_SIBLING,
SD_LV_MC,
SD_LV_BOOK,
SD_LV_CPU,
SD_LV_NODE,
SD_LV_ALLNODES,

6
include/linux/topology.h
View File

@ -201,6 +201,12 @@ int arch_update_cpu_topology(void);
.balance_interval = 64, \
}
#ifdef CONFIG_SCHED_BOOK
#ifndef SD_BOOK_INIT
#error Please define an appropriate SD_BOOK_INIT in include/asm/topology.h!!!
#endif
#endif /* CONFIG_SCHED_BOOK */
#ifdef CONFIG_NUMA
#ifndef SD_NODE_INIT
#error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!

77
kernel/sched.c
View File

@ -6506,6 +6506,7 @@ struct s_data {
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;
@ -6517,6 +6518,7 @@ enum s_alloc {
sa_rootdomain,
sa_tmpmask,
sa_send_covered,
sa_this_book_map,
sa_this_core_map,
sa_this_sibling_map,
sa_nodemask,
@ -6570,6 +6572,31 @@ cpu_to_core_group(int cpu, const struct cpumask *cpu_map,
}
#endif /* CONFIG_SCHED_MC */
/*
* book sched-domains:
*/
#ifdef CONFIG_SCHED_BOOK
static DEFINE_PER_CPU(struct static_sched_domain, book_domains);
static DEFINE_PER_CPU(struct static_sched_group, sched_group_book);
static int
cpu_to_book_group(int cpu, const struct cpumask *cpu_map,
struct sched_group **sg, struct cpumask *mask)
{
int group = cpu;
#ifdef CONFIG_SCHED_MC
cpumask_and(mask, cpu_coregroup_mask(cpu), cpu_map);
group = cpumask_first(mask);
#elif defined(CONFIG_SCHED_SMT)
cpumask_and(mask, topology_thread_cpumask(cpu), cpu_map);
group = cpumask_first(mask);
#endif
if (sg)
*sg = &per_cpu(sched_group_book, group).sg;
return group;
}
#endif /* CONFIG_SCHED_BOOK */
static DEFINE_PER_CPU(struct static_sched_domain, phys_domains);
static DEFINE_PER_CPU(struct static_sched_group, sched_group_phys);
@ -6578,7 +6605,10 @@ cpu_to_phys_group(int cpu, const struct cpumask *cpu_map,
struct sched_group **sg, struct cpumask *mask)
{
int group;
#ifdef CONFIG_SCHED_MC
#ifdef CONFIG_SCHED_BOOK
cpumask_and(mask, cpu_book_mask(cpu), cpu_map);
group = cpumask_first(mask);
#elif defined(CONFIG_SCHED_MC)
cpumask_and(mask, cpu_coregroup_mask(cpu), cpu_map);
group = cpumask_first(mask);
#elif defined(CONFIG_SCHED_SMT)
@ -6839,6 +6869,9 @@ SD_INIT_FUNC(CPU)
#ifdef CONFIG_SCHED_MC
SD_INIT_FUNC(MC)
#endif
#ifdef CONFIG_SCHED_BOOK
SD_INIT_FUNC(BOOK)
#endif
static int default_relax_domain_level = -1;
@ -6888,6 +6921,8 @@ static void __free_domain_allocs(struct s_data *d, enum s_alloc what,
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:
@ -6934,8 +6969,10 @@ static enum s_alloc __visit_domain_allocation_hell(struct s_data *d,
return sa_nodemask;
if (!alloc_cpumask_var(&d->this_core_map, GFP_KERNEL))
return sa_this_sibling_map;
if (!alloc_cpumask_var(&d->send_covered, GFP_KERNEL))
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;
if (!alloc_cpumask_var(&d->tmpmask, GFP_KERNEL))
return sa_send_covered;
d->rd = alloc_rootdomain();
@ -6993,6 +7030,23 @@ static struct sched_domain *__build_cpu_sched_domain(struct s_data *d,
return sd;
}
static struct sched_domain *__build_book_sched_domain(struct s_data *d,
const struct cpumask *cpu_map, struct sched_domain_attr *attr,
struct sched_domain *parent, int i)
{
struct sched_domain *sd = parent;
#ifdef CONFIG_SCHED_BOOK
sd = &per_cpu(book_domains, i).sd;
SD_INIT(sd, BOOK);
set_domain_attribute(sd, attr);
cpumask_and(sched_domain_span(sd), cpu_map, cpu_book_mask(i));
sd->parent = parent;
parent->child = sd;
cpu_to_book_group(i, cpu_map, &sd->groups, d->tmpmask);
#endif
return sd;
}
static struct sched_domain *__build_mc_sched_domain(struct s_data *d,
const struct cpumask *cpu_map, struct sched_domain_attr *attr,
struct sched_domain *parent, int i)
@ -7049,6 +7103,15 @@ static void build_sched_groups(struct s_data *d, enum sched_domain_level l,
&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,
&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);
@ -7097,12 +7160,14 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
sd = __build_numa_sched_domains(&d, cpu_map, attr, i);
sd = __build_cpu_sched_domain(&d, cpu_map, attr, sd, i);
sd = __build_book_sched_domain(&d, cpu_map, attr, sd, i);
sd = __build_mc_sched_domain(&d, cpu_map, attr, sd, i);
sd = __build_smt_sched_domain(&d, cpu_map, attr, sd, i);
}
for_each_cpu(i, cpu_map) {
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);
}
@ -7133,6 +7198,12 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
init_sched_groups_power(i, sd);
}
#endif
#ifdef CONFIG_SCHED_BOOK
for_each_cpu(i, cpu_map) {
sd = &per_cpu(book_domains, i).sd;
init_sched_groups_power(i, sd);
}
#endif
for_each_cpu(i, cpu_map) {
sd = &per_cpu(phys_domains, i).sd;
@ -7158,6 +7229,8 @@ static int __build_sched_domains(const struct cpumask *cpu_map,
sd = &per_cpu(cpu_domains, i).sd;
#elif defined(CONFIG_SCHED_MC)
sd = &per_cpu(core_domains, i).sd;
#elif defined(CONFIG_SCHED_BOOK)
sd = &per_cpu(book_domains, i).sd;
#else
sd = &per_cpu(phys_domains, i).sd;
#endif