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sched: Simplify NODE/ALLNODES domain creation 

Don't treat ALLNODES/NODE different for difference's sake. Simply
always create the ALLNODES domain and let the sd_degenerate() checks
kill it when its redundant. This simplifies the code flow.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20110407122942.455464579@chello.nl
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2011-04-07 14:09:54 +02:00 committed by Ingo Molnar
parent 3859173d43
commit 3bd65a80af
1 changed files with 24 additions and 20 deletions
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44
kernel/sched.c
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@ -6838,9 +6838,6 @@ struct sd_data {
};
struct s_data {
#ifdef CONFIG_NUMA
int sd_allnodes;
#endif
cpumask_var_t nodemask;
cpumask_var_t send_covered;
struct sched_domain ** __percpu sd;
@ -7112,30 +7109,35 @@ static void claim_allocations(int cpu, struct sched_domain *sd)
}
}
static struct sched_domain *__build_numa_sched_domains(struct s_data *d,
const struct cpumask *cpu_map, struct sched_domain_attr *attr, int i)
static struct sched_domain *__build_allnodes_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 = NULL;
#ifdef CONFIG_NUMA
struct sched_domain *parent;
d->sd_allnodes = 0;
if (cpumask_weight(cpu_map) >
SD_NODES_PER_DOMAIN * cpumask_weight(d->nodemask)) {
sd = sd_init_ALLNODES(d, i);
set_domain_attribute(sd, attr);
cpumask_copy(sched_domain_span(sd), cpu_map);
d->sd_allnodes = 1;
}
parent = sd;
sd = sd_init_NODE(d, i);
sd = sd_init_ALLNODES(d, i);
set_domain_attribute(sd, attr);
sched_domain_node_span(cpu_to_node(i), sched_domain_span(sd));
cpumask_copy(sched_domain_span(sd), cpu_map);
sd->parent = parent;
if (parent)
parent->child = sd;
#endif
return sd;
}
static struct sched_domain *__build_node_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 = NULL;
#ifdef CONFIG_NUMA
sd = sd_init_NODE(d, i);
set_domain_attribute(sd, attr);
sched_domain_node_span(cpu_to_node(i), sched_domain_span(sd));
cpumask_and(sched_domain_span(sd), sched_domain_span(sd), cpu_map);
sd->parent = parent;
if (parent)
parent->child = sd;
#endif
return sd;
}
@ -7220,7 +7222,9 @@ static int build_sched_domains(const struct cpumask *cpu_map,
cpumask_and(d.nodemask, cpumask_of_node(cpu_to_node(i)),
cpu_map);
sd = __build_numa_sched_domains(&d, cpu_map, attr, i);
sd = NULL;
sd = __build_allnodes_sched_domain(&d, cpu_map, attr, sd, i);
sd = __build_node_sched_domain(&d, cpu_map, attr, sd, 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);